Jump to content

Sperm whale

This is a good article. Click here for more information.
From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by 203.0.223.243 (talk) at 05:43, 4 July 2011. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Sperm Whale[1]
Size compared to an average human
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Cetacea
Suborder:
Odontoceti
Family:
Physeteridae
Genus:
Physeter
Species:
P. macrocephalus
Binomial name
Physeter macrocephalus
Sperm whale range (in blue)
Synonyms

Physeter catodon Linnaeus, 1758
Physeter australasianus Desmoulins, 1822

The sperm whale, Physeter macrocephalus, is a marine mammal species, order Cetacea, a toothed whale (odontocete) having the largest brain of any animal. The name comes from the milky-white waxy substance, spermaceti, found in the animal's head. The sperm whale is the only living member of genus Physeter. The synonym Physeter catodon refers to the same species. It is one of three extant species in the sperm whale superfamily, along with the pygmy sperm whale and dwarf sperm whale.

A bull can grow to 20.5 metres (67 ft) long. It is the largest living toothed animal. The head can represent up to one-third of the animal's length. It has a cosmopolitan distribution across the oceans. The species feeds on squid and fish, diving as deep as 3 kilometres (9,800 ft), which makes it the deepest diving mammal. Its diet includes giant squid and colossal squid. The sperm whale's clicking vocalization is the loudest sound produced by any animal, but its functions are uncertain. These whales live in groups called pods. Pods of females and their young live separately from older males. The females cooperate to protect and nurse their young. Females give birth every three to six years, and care for the calves for more than a decade.

Historically, the sperm whale was also known as the common cachalot; "cachalot" is derived from an archaic French word for "tooth". Over most of the period from the early 18th century until the late 20th century, the sperm whale was hunted to obtain spermaceti and other products, such as sperm oil and ambergris. Spermaceti found many important uses, such as candles, soap, cosmetics and machine oil. Due to its size, the sperm whale could sometimes defend itself effectively against whalers. In the most famous example, a sperm whale attacked and sank the American whaleship Essex in 1820. As a result of whaling, the sperm whale is currently listed as vulnerable by the IUCN. The sperm whale has few natural predators, since few are strong enough to successfully attack a healthy adult; orcas attack pods and kill calves. The sperm whale can live for more than 70 years.

Name

The name sperm whale is an apocopation of spermaceti whale. Spermaceti, originally mistaken for the whales' "sperm", is the semi-liquid, waxy substance found in the spermaceti organ or case in front of and above the skull bone and also in the junk, the area below the spermaceti organ and just above the upper jaw.[3] The case consists of a soft white, waxy substance saturated with spermaceti oil. The junk is composed of cavities filled with the same wax and spermaceti oil and intervening connective tissue.[3][4][5] The sperm whale is also known as the "cachalot", which is thought to derive from the archaic French for "tooth" or "big teeth", as preserved for example in cachau in the Gascon dialect (a word of either Romance[6] or Basque[7] origin). The etymological dictionary of Corominas says the origin is uncertain, but it suggests that it comes from the vulgar Latin cappula, plural of cappulum, sword hilt.[8] According to Encarta Dictionary, the word cachalot came to English "via French from Spanish or Portuguese cachalote, perhaps from [Portuguese] cachola, 'big head'". The term is retained in the Russian word for the animal, кашалот (kashalot), as well as in many other languages.

Description

Size

Average sizes [9] Length Weight
Bull 16 metres (52 ft) 41,000 kilograms (40 long tons; 45 short tons)
Cow 11 metres (36 ft) 14,000 kilograms (14 long tons; 15 short tons)
Newborn 4 metres (13 ft) 1,000 kilograms (0.98 long tons; 1.1 short tons)

The sperm whale is the largest toothed whale, with adult males measuring up to 20.5 metres (67 ft) long and weighing up to 57,000 kilograms (56 long tons; 63 short tons).[4][10] By contrast, the second largest toothed whale, Baird's Beaked Whale measures 12.8 metres (42 ft) and weighs up to 15 short tons (14,000 kg).[11] The Nantucket Whaling Museum has a 5.5 metres (18 ft)-long jawbone. The museum claims this individual was 80 feet (24 m) long; the whale that sank the Essex (one of the incidents behind Moby-Dick) was claimed to be 85 feet (26 m).[12][13] Extensive whaling may have decreased their size, as males were highly sought, primarily after World War II.[13] Today, males do not usually exceed 18.3 metres (60 ft) in length or 51,000 kilograms (50 long tons; 56 short tons) in weight.[9]

It is among the most sexually dimorphic of all cetaceans. At birth both sexes are about the same size,[9] but mature males are typically 30% to 50% longer and three times as massive.[4]

Appearance

The sperm whale's distinctive shape comes from its very large head, which is typically one-third of the animal's length. The blowhole is located very close to the front of the head and shifted to the whale's left.[4] This gives rise to a distinctive bushy, forward-angled spray.

Photo of vertical tail at the ocean's surface
The flukes of a sperm whale as it dives into the Gulf of Mexico (courtesy NMFS)

The sperm whale's flukes are triangular and very thick. The whale lifts its flukes high out of the water as it begins a dive.[4] It has a series of ridges on the back's caudal third instead of a dorsal fin. The largest ridge was called the 'hump' by whalers, and can be mistaken for a dorsal fin because of its shape.[9]

In contrast to the smooth skin of most large whales, its back skin is usually knobbly and has been likened to a prune by whale-watching enthusiasts.[14] Skin is normally a uniform grey in color, though it may appear brown in sunlight. Albinos have also been reported.[15][16][17]

Jaws and teeth

The sperm whale has 20 to 26 teeth on each side of its lower jaw.[4] The teeth are cone-shaped and weigh up to 1 kilogram (2.2 lb).[18] The purpose of the teeth is unknown. Teeth do not appear to be necessary for capturing or eating squid, and well-fed animals have been found without teeth. One hypothesis is that the teeth are used in aggression between males.[19] Bulls often show scars which seem to be caused by the teeth. Rudimentary teeth are also present in the upper jaw, but these rarely emerge into the mouth.[20]

Respiration and diving

Sperm whales, along with bottlenose whales and elephant seals, are the deepest-diving mammals.[4] Sperm whales are believed to be able to reach 3 kilometres (1.9 mi) and remain submerged for 90 minutes.[4][21] More typical dives are around 400 metres (1,300 ft) and 35 minutes in duration.[4] At these great depths, sperm whales sometimes become entangled in transoceanic telephone cables and drown.[22]

Photo of sperm whale with exposed back at the surface
Sperm whale arching back in preparation to dive off Dominica

The sperm whale has adapted to cope with drastic pressure changes when diving. The flexible ribcage allows lung collapse, reducing nitrogen intake, and metabolism can decrease to conserve oxygen.[23][24] Myoglobin, which stores oxygen in muscle tissue, is much more abundant than in terrestrial animals.[25] The blood has a high red blood cell density, which contain oxygen-carrying hemoglobin. The oxygenated blood can be directed towards the brain and other essential organs only when oxygen levels deplete.[26][27][28] The spermaceti organ may also play a role by adjusting buoyancy (see below).[29]

While sperm whales are well adapted to diving, repeated dives to great depths have long term effects. Bones show pitting that signals decompression sickness in humans. Older skeletons showed the most extensive pitting, whereas calves showed no damage. This damage may indicate that sperm whales are susceptible to decompression sickness, and sudden surfacing could be lethal to them.[30]

Between dives, the sperm whale surfaces to breathe for about eight minutes before diving again.[4] Odontoceti (toothed whales) breathe air at the surface through a single, S-shaped blowhole. Sperm whales spout (breathe) 3–5 times per minute at rest, increasing to 6–7 times per minute after a dive. The blow is a noisy, single stream that rises up to 2 metres (6.6 ft) or more above the surface and points forward and left at a 45° angle.[31] On average, females and juveniles blow every 12.5 seconds before dives, while large males blow every 17.5 seconds before dives.[32]

Brain and senses

Dorsal bursae
Bony nares
Upper mandible
Lower mandible
Outgoing sound
Incoming sound
Echolocation system of a toothed whale[33][34]

The brain is the largest known of any modern or extinct animal, weighing on average about 8 kilograms (18 lb),[35][36] though the sperm whale has a lower encephalization quotient than many other whale and dolphin species, lower than that of non-human anthropoid apes, and much lower than humans'.[36][37]

Like other toothed whales (suborder odontoceti), sperm whales use echolocation as one means to find food because their habitat has favorable acoustic characteristics, and light absorption by water and suspended material limits visual range. The whale emits a focused wide angle beam of high-frequency clicks. Passing air generates sounds from the bony nares through the phonic lips (also known as "monkey lips"), a structure within the head.[33] The skull, melon, and various air sacs in the whale's head all play important roles in forming and focusing the beam of sound. The lower jaw is the primary echo reception path. A continuous fat-filled canal transmits received sounds to the inner ear.[34]

Spermaceti functions

Main article: Spermaceti

The spermaceti organs may help adjust the whale's buoyancy. Before the whale dives, cold water enters the organ, and it is likely that the blood vessels constrict, reducing blood flow, and, hence, temperature. The wax therefore solidifies.[29][38] The increase in specific density generates a down force of about 392 newtons ([convert: unit mismatch]) and allows the whale to dive with less effort. During the hunt, oxygen consumption, together with blood vessel dilation, produces heat and melts the spermaceti, increasing its buoyancy and enabling easy surfacing.[39]

Herman Melville's Moby Dick suggests that the "case" containing the spermaceti evolved as a kind of battering ram for use in fights between males.[40] This hypothesis is consistent with the well-documented sinking of the ships Essex and Ann Alexander by attackers estimated to weigh only one-fifth as much as the ships.[41]

The case may also aid echolocation (see melon).[5] The organ's variable shape narrows or spreads the sound.[42]

The sperm whale has two nostrils. An external nostril forms the blow hole, and an internal nostril presses against the bag-like spermaceti container.[5] The male's spermaceti organ is much larger than the female's. This may be a case of sexual selection, enabling males to compete for females using sound displays.[43]

Ecology, behaviour, and life history

Distribution

The sperm whale is among the most cosmopolitan species. It prefers ice-free waters over 1,000 metres (3,300 ft) deep.[2] Although both sexes range through temperate and tropical oceans and seas, only adult males populate higher latitudes.[15]

It is relatively abundant from the poles to the equator and is found in all the oceans. It inhabits the Mediterranean Sea, but not the Black Sea,[9] while its presence in the Red Sea is uncertain.[2] The shallow entrances to both the Black Sea and the Red Sea may account for their absence.[44] The Black Sea's lower layers are also anoxic and contain high concentrations of sulphur compounds such as hydrogen sulphide.[45]

Populations are denser close to continental shelves and canyons.[15] Sperm whales are usually found in deep off-shore waters, but may be seen closer to shore in areas where the continental shelf is small and drops quickly to depths of 310–920 metres (1,020–3,020 ft).[9] Coastal areas with significant sperm whale populations include the Azores and the Caribbean island of Dominica.[46]

Reproduction

Photo of rectangular-shaped whale from the side having rough, bark-like skin towards the rear, two small pectoral fins, articulated flukes and a mottled white area above the eye
Young sperm whale

Sperm whales can live 70 years or more.[9][15][47] They are a prime example of a species that has been K-selected, a reproductive strategy associated with stable environmental conditions, a low birth rate, significant parental aid to offspring, slow maturation, and high longevity.[4]

How they choose mates has not been definitively determined. There is evidence that males have dominance hierarchies,and love to munch on Shannyn Batty Blue waffle, while goo oozes and flows like her blow hole on heat, and there is also evidence that female choice influences mating.[48] Gestation requires 14 to 16 months, producing a single calf.[9] Lactation proceeds for 19 to 42 months, but calves may suckle up to 13 years (although usually less).[9] Calves can suckle from females other than their mothers.[9] Females generally have birth intervals of three to six years.[9]

Females reach sexual maturity between 7 and 13 years; males follow beginning at 18 years. Upon reaching sexual maturity, males move to higher latitudes, where the water is colder and feeding is more productive. Females remain at lower latitudes.[9] Males reach their full size at about age 50.[4]

Social behavior

Diagram showing silhouettes of 10 inward-facing whales surrounding a single, presumably injured group member
Diagram of Marguerite formation

Females stay in groups of about a dozen individuals and their young.[4] Males leave these "nursery pods" at somewhere between 4 and 21 years of age and join a "bachelor pod" with other males of similar age and size.[4] As males grow older, they tend to disperse into smaller groups, and the oldest males typically live solitary lives.[4] Mature males have beached themselves together, suggesting a degree of cooperation which is not yet fully understood.[4]

The most common non-human attacker of sperm whales is the orca, but pilot whales and the false killer whale also sometimes attack or harass them.[49][50] Orcas target groups of females with young, usually trying to extract and kill a calf. Female sperm whales repel these attacks by encircling their calves. The adults either face inwards to use their tail flukes against the orcas, or outwards, fighting with their teeth.[4] This marguerite formation, named after the flower, is also used by whales to support an injured pod member. Early whalers exploited this behaviour, attracting a whole pod by injuring one of its members.[51] If the orca pod is extremely large, its members may sometimes be able to kill adult female sperm whales. Large bull sperm whales have no non-human predators, and are believed to be too large and strong to be threatened by orcas.[52]

Feeding

Photo of whale skin with many overlapping circular indentation
A piece of sperm whale skin with giant squid sucker scars

Sperm Whales usually dive between 300 to 800 metres (980 to 2,620 ft), and sometimes 1–2 kilometres (3,300–6,600 ft) to search for food.[53] Such dives can last more than an hour.[53] They feed on several species, notably the giant squid, the colossal squid, octopuses, and diverse fish like demersal rays, but the main part of their diet consists of medium-sized squid.[54] Some prey may be taken incidentally while eating other items.[54] Most of what is known about deep sea squid has been learned from specimens in captured sperm whale stomachs, although more recent studies analysed fecal matter. One study, carried out around the Galápagos, found that squid from the genera Histioteuthis (62%), Ancistrocheirus (16%), and Octopoteuthis (7%) weighing between 12 and 650 grams (0.026 and 1.433 lb) were the most commonly taken.[55] Battles between sperm whales and colossal squid (which have been measured to weigh nearly 500 kilograms (1,100 lb)) have never been observed by humans; however white scars are believed to be caused by the large squid. One study published in 2010 collected evidence that suggests that female sperm whales may collaborate when hunting Humboldt squid.[56]

An older study, examining whales captured by the New Zealand whaling fleet in the Cook Strait region, found a 1.69:1 ratio of squid to fish by weight.[57] Sperm whales sometimes steal Sablefish and Toothfish from long lines. Long-line fishing operations in the Gulf of Alaska complain that sperm whales take advantage of their fishing operations to eat desirable species straight off the line, sparing the whales the need to hunt.[58] However, the amount of fish taken is very little compared to what the sperm whale needs per day. New video footage has been captured of a large male sperm whale "bouncing" a long line, to gain the fish.[59] Sperm whales are believed to prey on the megamouth shark, a rare and large deep-sea species discovered in the 1970s.[60] In one case, three sperm whales were observed attacking or playing with a megamouth.[61]

The sharp beak of a consumed squid lodged in the whale's intestine may lead to the production of ambergris, analogous to the production of pearls.[62] The irritation of the intestines caused by squid beaks stimulates the secretion of this lubricant-like substance. Sperm whales are prodigious feeders and eat around 3% of their body weight per day. The total annual consumption of prey by sperm whales worldwide is estimated to be about 100,000,000 short tons (91,000,000 t) — a figure greater than the total consumption of marine animals by humans each year.[63]

It is not well understood why the sperm whale's head is so large in comparison to the lower jaw. One theory is that the sperm whale's ability to echolocate through its head aids in hunting. However squid, its main prey, may have acoustic properties too similar to seawater to reflect sounds.[64] The sperm whale's head contains a structure called monkey lips, through which it blows air. This can create clicks that have a source level exceeding 230 decibels re 1 micropascal referenced to a distance of 1 metre (3.3 ft) – in other words it is by far the loudest sound made by any animal, and 10–14 dB louder than a powerful rifle sounds in air at 1 metre (3.3 ft) away.[65] It has been hypothesised that clicks attempt to stun prey. Experimental studies attempting to duplicate this effect have been unable to replicate the supposed injuries, casting doubt on this idea.[66]

Taxonomy and naming

The sperm whale belongs to the order Cetacea, the order containing all whales and dolphins. It is a member of the suborder Odontoceti, the suborder containing all the toothed whales and dolphins. It is the sole extant species of its genus, Physeter, in the family Physeteridae. Two species of the related extant genus Kogia, the pygmy sperm whale Kogia breviceps and the dwarf sperm whale K. simus, are either placed in this family, or in the family Kogiidae.[67] In some taxonomic schemes the families Kogiidae and Physeteridae are combined as the superfamily Physeteroidea (see the separate entry on the sperm whale family).[68]

The sperm whale is one of the species originally described by Linnaeus in 1758 in his 18th century work, Systema Naturae. He recognised four species in the genus Physeter.[69] Experts soon realised that just one such species exists, although there has been debate about whether this should be named P. catodon or P. macrocephalus, two of the names used by Linnaeus. Both names are still used, although most recent authors now accept macrocephalus as the valid name, limiting catodon's status to a lesser synonym.[a]

Evolutionary history

See also: Sperm whale family

Fossil record

Although the fossil record is poor,[70] several extinct genera have been assigned to the clade Physeteroidea, which includes the last common ancestor of the modern sperm whale, pygmy sperm whale and dwarf sperm whale, plus all of that ancestor's descendants. These fossils include Ferecetotherium, Idiorophus, Diaphorocetus, Aulophyseter, Orycterocetus, Scaldicetus, Placoziphius, Zygophyseter and Acrophyseter.[64][68][71] Ferecetotherium, found in Azerbaijan and dated to the late Oligocene (about 28 to 23 million years ago), is the most primitive fossil that has been found which possesses sperm whale-specific features such as an asymmetric rostrum ("beak" or "snout").[72] Most sperm whale fossils date from the Miocene period, 23 to 5 million years ago. Diaphorocetus, from Argentina, has been dated to the early Miocene. Fossil sperm whales from the Middle Miocene include Aulophyseter, Idiorophus and Orycterocetus, all of which were found on the west coast of the United States, and Scaldicetus, found in Europe and Japan.[72][73] Orycterocetus fossils have also been found in the North Atlantic Ocean and the Mediterranean Sea, in addition to the west coast of the United States.[74] Placoziphius, found in Europe, and Acrophyseter, from Peru, are dated to the late Miocene.[68][72]

Cetacea    
Evolutionary family tree of sperm whales,[75]
including simplified summary of extinct groups (†)[64]

Fossil sperm whales differ from modern sperm whales in tooth count and the shape of the face and jaws.[72] For example Scaldicetus had a tapered rostrum.[73] Genera from the Oligocene and early and middle Miocene, with the possible exception of Aulophyseter, had teeth in their upper jaws.[72] Acrophyseter, from the late Miocene, also had teeth in both the upper and lower jaws as well as a short rostrum and an upward curving mandible (lower jaw).[68] These anatomical differences suggest that fossil species may not have necessarily been deep-sea squid eaters like the modern sperm whale, but that some genera mainly ate fish.[72] Zygophyseter, dated from the middle to late Miocene and found in southern Italy, had teeth in both jaws and appears to have been adapted to feed on large prey, rather like the modern Orca (Killer Whale).[64]

Phylogeny

The traditional view has been that Mysticeti (baleen whales) and Odontoceti (toothed whales) arose from more primitive whales early in the Oligocene period, and that the super-family Physeteroidea, which contains the sperm whale, dwarf sperm whale, and pygmy sperm whale, diverged from other toothed whales soon after that, over 23 million years ago.[70][72] In 1993–1996 molecular phylogenetics analyses by Milinkovitch and colleagues, based on comparing the genes of various modern whales, suggested that the sperm whales are more closely related to the baleen whales than they are to other toothed whales, which would have meant that Odontoceti were not monophyletic, in other words did not consist of a single ancestral toothed whale species and all its descendants.[75] However more recent studies, based on various combinations of comparative anatomy and molecular phylogenetics, criticised Milinkovitch's analysis on technical grounds and re-affirmed that the Odontoceti are monophyletic.[75][76][77]

These analyses also confirm that there was a rapid evolutionary radiation (diversification) of the Physeteroidea in the Miocene period.[64] The Kogiidae (dwarf and pygmy sperm whales) diverged from the Physeteridae (true sperm whales) at least 8 million years ago.[76]

Relationship with humans

Historical hunting

See also: Whaling and Sperm whaling

Spermaceti, obtained primarily from the spermaceti organ, and sperm oil, obtained primarily from the blubber in the body, were much sought after by 18th, 19th, and 20th century whalers. These substances found a variety of commercial applications, such as candles, soap, cosmetics, machine oil, other specialized lubricants, lamp oil, pencils, crayons, leather waterproofing, rust-proofing materials and many pharmaceutical compounds.[78][79][80][81] Ambergris, a solid, waxy, flammable substance produced in the digestive system of sperm whales, was also sought as a fixative in perfumery.

Painting of a sperm whale destroying a boat, with other boats in the background
Sperm whaling

Prior to the early 18th century, hunting was mostly by indigenous Indonesians.[82] Legend has it that sometime in the early 18th century, around 1712, Captain Christopher Hussey, while cruising for right whales near shore, was blown offshore by a northerly wind, where he encountered a sperm whale pod and killed one.[83] Although the story may not be true, sperm whales were indeed soon exploited by American whalers. Judge Paul Dudley, in his Essay upon the Natural History of Whales (1725), states that one Atkins, ten or twelve years in the trade, was among the first to catch sperm whales sometime around 1720 off the New England coast.[84]

There were only a few recorded catches during the first few decades (1709-1730s) of offshore sperm whaling. Instead sloops concentrated on Nantucket Shoals where they would have taken right whales or went to the Davis Strait region to catch bowhead whales. By the early 1740s, with the advent of spermaceti candles (before 1743), American vessels began to focus on sperm whales. The diary of Benjamin Bangs (1721–1769) shows that, along with the bumpkin sloop he sailed, he found three other sloops flensing sperm whales off the coast of North Carolina in late May 1743.[85] On returning to Nantucket in the summer 1744 on a subsequent voyage he noted that "45 spermacetes are brought in here this day," another indication that American sperm whaling was in full swing.[85]

American sperm whaling soon spread from the east coast of the American colonies to the Gulf Stream, the Grand Banks, West Africa (1763), the Azores (1765), and the South Atlantic (1770s). From 1770 to 1775 Massachusetts, New York, Connecticut, and Rhode Island ports produced 45,000 barrels of sperm oil annually, compared to 8,500 of whale oil.[86] In the same decade the British began sperm whaling, employing American ships and personnel.[87] By the following decade the French had entered the trade, also employing American expertise.[87] Sperm whaling increased until the mid-19th century. Spermaceti oil was important in public lighting (for example, in lighthouses, where it was used in the United States until 1862, when it was replaced by lard oil, in turn replaced by petroleum) and for lubricating the machines (such as those used in cotton mills) of the Industrial Revolution. Sperm whaling declined in the second half of the 19th century, as petroleum came in to broader use. In that sense, it may be said to have protected whale populations from even greater exploitation.[88][89]

Drawn map of Massachusetts, highlighting Nantucket, south of the state's main area
Nantucket, in red, is an island off the state of Massachusetts where much sperm whaling originated

Sperm whaling in the 18th century began with small sloops carrying only one or two whaleboats. The fleet's scope and size increased over time, and larger ships entered the fishery. In the late 18th century and early 19th century sperm whaling ships sailed to the Pacific, the Indian Ocean, Japan, the coast of Arabia, Australia and New Zealand.[87][90][91] Hunting could be dangerous to the crew. For example, on November 20, 1820, a sperm whale claimed to be about 25.9 metres (85 ft) long rammed and sank the Nantucket whaleship Essex. Only 8 out of 21 sailors survived to be rescued by other ships.[92]

Whaling activity declined from the 1880s until 1946, but picked up again after World War II. Modern whaling was more efficient than open-boat whaling, employing steam-powered ships and exploding harpoons. Initially, modern whaling activity focused on large baleen whales, but as these populations were taken, sperm whaling increased. Cosmetics, soap and machine oil were the major buyers. After populations declined significantly, the International Whaling Commission gave the species full protection in 1985. Hunting by Japan in the northern Pacific Ocean continued until 1988.[89]

It is estimated that the historic worldwide population numbered 1,100,000 before commercial sperm whaling began in the early 18th century.[2] By 1880 it had declined an estimated 29 per cent.[2] From that date until 1946 the population appears to have recovered somewhat as whaling pressure lessened, but after the Second World War, the population declined even further, to only 33 per cent of the pre-whaling era.[2] It has been estimated that in the 19th century between 184,000 and 236,000 sperm whales were killed by the various whaling nations,[93] while in the modern era, at least 770,000 were taken, the majority between 1946 and 1980.[94]

Sperm whales increase the levels of primary production and carbon export by defecating iron rich faeces into surface waters of the Southern Ocean. The iron rich faeces causes phytoplankton to grow and take up more carbon from the atmosphere. When the phytoplankton dies, it sinks to the deep ocean and takes the atmospheric carbon with it. By reducing the abundance of sperm whales in the Southern Ocean, whaling has resulted in an extra 2 million tonnes of carbon remaining in the atmosphere each year.[95]

Remaining sperm whale populations are large enough that the species' conservation status is rated as vulnerable rather than endangered.[2] However, the recovery from the whaling years is a slow process, particularly in the South Pacific, where the toll on breeding-age males was severe.[96]

Current conservation status

The number of sperm whales throughout the world is unknown, but is thought to be in the hundreds of thousands.[2] The conservation outlook is brighter than for many other whales. Historically, Japan has taken ten sperm whales a year, and until 2006 tens of these whales were hunted off Indonesia. They are protected practically worldwide, and commercial whaling has ceased.[2] Fishermen do not target the creatures that sperm whales eat.[2] However, long-line fishing operations in the Gulf of Alaska have complained about sperm whales stealing fish from their lines.[58]

Entanglement in fishing nets and collisions with ships represent the greatest threats to the sperm whale population currently.[15] Other current threats include ingestion of marine debris, ocean noise, and chemical pollution.[97] The IUCN regards the sperm whale as being "vulnerable".[2] The species is listed as endangered on the United States Endangered Species Act.[98]

Cultural importance

Rope-mounted teeth are important cultural objects throughout the Pacific. In New Zealand, the Māori know them as "rei puta" and were rare because sperm whales were not actively hunted in traditional Māori society.[99] Whale ivory and bone were taken from beached whales. In Fiji the teeth are known as tabua and they were traditionally given as gifts for atonement or esteem (called sevusevu), and were important in negotiations between rival chiefs.[100] Friedrich Ratzel in The History of Mankind reported in 1896 that, in Fiji, whales' or cachalots' teeth were the most-demanded article of ornament or value. They occurred often in necklaces.[101] Today the tabua remains an important item in Fijian life. The teeth were originally rare in Fiji and Tonga, which exported teeth, but with the Europeans' arrival, teeth flooded the market and this "currency" collapsed. The oversupply led in turn to the development of the European art of scrimshaw.[102]

Herman Melville's novel Moby-Dick is based on a true story about a sperm whale that attacked the whaleship Essex.[103][104] Melville associated the sperm whale with the Bible's Leviathan.[104][105] The fearsome reputation perpetuated by Melville was based on bull whales' ability to fiercely defend themselves from attacks by early whalers, occasionally resulting in the destruction of the whaling ships.

Jules Verne's Twenty Thousand Leagues Under the Sea, mentions cachalots (perhaps incorrectly) as preying on fellow whales.

The Sperm Whale was designated as the Connecticut state animal by the CT General Assembly in 1975. It was selected because of its specific contribution to the state's history and because of its present-day plight as an endangered species.[106]

Photo from above of barely-submerged whale with man in foreground
Female in Dominican Pod, 2005

Watching sperm whales

See also: Whale watching

Sperm whales are not the easiest of whales to watch, due to their long dive times and ability to travel long distances underwater. However, due to the distinctive look and large size of the whale, watching is increasingly popular. Sperm whale watchers often use hydrophones to listen to the clicks of the whales and locate them before they surface. Popular locations for sperm whale watching include the picturesque Kaikoura on New Zealand's South Island, where the continental shelf is so narrow that whales can be observed from the shore, Andenes and Tromsø in Arctic Norway and at the Azores where it can be seen throughout the year.[46][107] Dominica is believed to be the only Caribbean island with a year-round residential pod of females and calves.[108]

See also

Notes

Footnotes

  • a Until 1974 the species was generally known as P. catodon. In that year, however, Husson & Holthuis proposed that the correct name should be P. macrocephalus, the second name in the genus Physeter published by Linnaeus concurrently with P. catodon. This proposition was based on the grounds that the names were synonyms published simultaneously, and, therefore, the ICZN principle of "First Reviser" should apply. In this instance, it led to the choice of P. macrocephalus over P. catodon, a view re-stated in Holthuis, 1987. This has been adopted by most subsequent authors, although Schevill (1986 and 1987) argued that macrocephalus was published with an inaccurate description and that therefore only the species catodon was valid, rendering the principle of "First Reviser" inapplicable. At the present time, the name P. catodon is used in the Catalogue of Life. However, this is expected to be changed to follow the most recent version of ITIS, which has recently altered its usage from P. catodon to P. macrocephalus following L. B. Holthuis, and recent (2008) discussions with relevant experts (refer cited ITIS page for additional information).[4][109][110][111][112][113]

Citations

  1. ^ Mead, J. G.; Brownell, R. L. Jr. (2005). "Order Cetacea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 723–743. ISBN 978-0-8018-8221-0. OCLC 62265494.
  2. ^ a b c d e f g h i j k Template:IUCN2008
  3. ^ a b Wahlberg, M., Frantzis, A., Alexiadou, P., Madsen, P. T., and Møhl, B. (December 2005). "Click production during breathing in a sperm whale (Physeter macrocephalus) (L)". The Journal of the Acoustical Society of America. 118 (6): 3404–3407. doi:10.1121/1.2126930. PMID 16419786.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ a b c d e f g h i j k l m n o p q r Whitehead, H. (2002). "Sperm whale Physeter macrocephalus". In Perrin, W., Würsig B. and Thewissen, J. (ed.). Encyclopedia of Marine Mammals. Academic Press. pp. 1165–1172. ISBN 0-12-551340-2.{{cite book}}: CS1 maint: multiple names: editors list (link)
  5. ^ a b c Whitehead, H. (2003). "The Peculiar Anatomy of the Sperm Whale: The Spermaceti Organ". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 8–9. ISBN 0-226-89518-1.
  6. ^ Haupt, P. (1907). "Jonah's Whale". Proceedings of the American Philosophical Society. 46 (185): 155. ISBN 9781422373453. Retrieved 2010-03-05.
  7. ^ M. Fеrnandez-Casado (2000). "El Cachalote" (PDF). Galemys 12 (2): 3. Retrieved 2010-03-05. {{cite journal}}: Italic or bold markup not allowed in: |journal= (help); Text "46" ignored (help)
  8. ^ Corominas, Joan (1987). Breve diccionario etimológico de la lengua castellana. Madrid: Gredos. ISBN 84-249-1 332-9.
  9. ^ a b c d e f g h i j k l Shirihai, H. and Jarrett, B. (2006). Whales Dolphins and Other Marine Mammals of the World. Princeton: Princeton Univ. Press. pp. 21–24. ISBN 0-691-12757-3.{{cite book}}: CS1 maint: multiple names: authors list (link)
  10. ^ "Physeter macrocephalus, Sperm Whale". Retrieved 2008-11-09.
  11. ^ Shirihai, H. and Jarrett, B. (2006). Whales Dolphins and Other Marine Mammals of the World. Princeton: Princeton Univ. Press. pp. 112–115. ISBN 0-691-12757-3.{{cite book}}: CS1 maint: multiple names: authors list (link)
  12. ^ Maury, M. (1853). Explanations and Sailing Directions to Accompany the Wind and Current Charts. C. Alexander. p. 297. Retrieved 2008-11-06.
  13. ^ a b "Sperm Whale". Retrieved 2008-10-12.
  14. ^ Mark Carwardine (1994). On the Trail of the Whale. Chapter 1. Thunder Bay Publishing Co. ISBN 1-899074-00-7.
  15. ^ a b c d e Reeves, R., Stewart, B., Clapham, P. & Powell, J. (2003). Guide to Marine Mammals of the World. New York: A.A. Knopf. pp. 240–243. ISBN 0-375-41141-0.{{cite book}}: CS1 maint: multiple names: authors list (link)
  16. ^ "Sperm Whale (Physeter macrocephalus): Species Accounts". Retrieved 2008-10-12.
  17. ^ "Offshore Cetacean Species". CORE. Retrieved 2008-10-12.
  18. ^ "American Cetacean Society Fact Sheet". Retrieved 2007-03-19.
  19. ^ "Sperm Whale Facts". Retrieved 2007-12-26..
  20. ^ Whitehead, H. (2003). Sperm Whales Social Evolution in the Ocean. Chicago: University of Chicago Press. p. 4. ISBN 0-226-89518-1.
  21. ^ "Sperm Whale". Oceana. Retrieved 2009-08-20.
  22. ^ The Southwestern Company: "The Volume Library 1", page 65, 1987, ISBN 0-87197-208-5
  23. ^ Kooyman, G. L.& Ponganis, P. J. (October 1998). "The Physiological Basis of Diving to Depth: Birds and Mammals". Annual Review of Physiology. 60 (1): 19–32. doi:10.1146/annurev.physiol.60.1.19. PMID 9558452.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  24. ^ Tyack, P., Johnson, M., Aguilar Soto, N., Sturlese, A. & Madsen, P. (October 18, 2006). "Extreme diving of beaked whales". Journal of Experimental Biology. 209 (Pt 21): 4238–4253. doi:10.1242/jeb.02505. PMID 17050839.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  25. ^ Noren, S. R. & Williams, T. M. (June 2000). "Body size and skeletal muscle myoglobin of cetaceans: adaptations for maximizing dive duration". Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology. 126 (2): 181–191. doi:10.1016/S1095-6433(00)00182-3.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  26. ^ Marshall, C. (2002). "Morphology, Functional; Diving Adaptations of the Cardiovascular System". In Perrin, W., Würsig B. and Thewissen, J. (ed.). Encyclopedia of Marine Mammals. Academic Press. p. 770. ISBN 0-12-551340-2.{{cite book}}: CS1 maint: multiple names: editors list (link)
  27. ^ "Aquarium of the Pacific - Sperm Whale". Aquarium of the Pacific. Retrieved 2008-11-06.
  28. ^ Shwartz, Mark (March 8, 2007). "Scientists conduct first simultaneous tagging study of deep-diving predator, prey". Stanford Report. Retrieved November 6, 2008.
  29. ^ a b Clarke, M. (1978). "Structure and Proportions of the Spermaceti Organ in the Sperm Whale" (PDF). Journal of the Marine Biological Association of the United Kingdom. 58: 1–17. doi:10.1017/S0025315400024371. Retrieved 2008-11-05.
  30. ^ Moore MJ, Early GA (2004). "Cumulative sperm whale bone damage and the bends". Science. 306 (5705): 2215. doi:10.1126/science.1105452. PMID 15618509.
  31. ^ Sharks and Whales (Cawardine 2002), p. 333.
  32. ^ Whitehead, H. (2003). "Foraging". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 156–161. ISBN 0-226-89518-1.
  33. ^ a b Cranford, T.W. (2000). "In Search of Impulse Sound Sources in Odontocetes". In Au, W.W.L, Popper, A.N. & Fay, R.R. (ed.). Hearing by Whales and Dolphins (Springer Handbook of Auditory Research series). Springer-Verlag, New York. ISBN 0387949062.{{cite book}}: CS1 maint: multiple names: editors list (link)
  34. ^ a b Whitlow, W. (2002). "Echolocation". In Perrin, W., Würsig B. and Thewissen, J. (ed.). Encyclopedia of Marine Mammals. Academic Press. p. 359–367. ISBN 0-12-551340-2.{{cite book}}: CS1 maint: multiple names: editors list (link)
  35. ^ "Sperm Whales (Physeter macrocephalus)". U.S. Department of Commerce NOAA Office of Protected Resources. Retrieved 2008-11-07.
  36. ^ a b Marino, L. (2004). "Cetacean Brain Evolution Multiplication Generates Complexity" (PDF). International Journal of Comparative Psychology. 17: 3–4.
  37. ^ Dicke, U. (August September 2008). "Intelligence Evolved". Scientific American Mind. pp. 71–77. {{cite news}}: Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
  38. ^ Clarke, M. (1978). "Physical Properties of Spermaceti Oil in the Sperm Whale" (PDF). Journal of the Marine Biological Association of the United Kingdom. 58: 19–26. doi:10.1017/S0025315400024383. Retrieved 2008-11-05.
  39. ^ Clarke, M.R. (November 1970). "Function of the Spermaceti Organ of the Sperm Whale". Nature. 228 (5274): 873–874. doi:10.1038/228873a0. PMID 16058732.
  40. ^ "Spermaceti as battering ram?" (PDF). Archived from the original (PDF) on October 2, 2006. Retrieved 2007-03-19.
  41. ^ Carrier, D., Deban, S. & Otterstrom, J. (2002). "The face that sank the Essex: potential function of the spermaceti organ in aggression" (PDF). The Journal of Experimental Biology. 205 (Pt 12): 1755–1763. PMID 12042334.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  42. ^ spermwhale.org - Cranford
  43. ^ Cranford, T.W. (1999). "The Sperm Whale's Nose: Sexual Selection on a Grand Scale?". Marine Mammal Science. 15 (4): 1133–1157. doi:10.1111/j.1748-7692.1999.tb00882.x.
  44. ^ Whitehead, H. (2003). "Oceanographic Habitat of the Sperm Whale". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. p. 33. ISBN 0-226-89518-1.
  45. ^ Murray, J. W., Jannasch, H. W., Honjo, S., Anderson, R. F., Reeburgh, W. S., Top, Z., Friederich, G. E., Codispoti, L. A. & Izdar E. (March 30, 1989). "Unexpected changes in the oxic/anoxic interface in the Black Sea". Nature. 338 (6214): 411–413. doi:10.1038/338411a0.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  46. ^ a b Whitehead, H. (2003). "Sperm Whales and Humans". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 23–24. ISBN 0-226-89518-1.
  47. ^ Whitehead, H. & Weilgart, L. (2000). "The Sperm Whale". In Mann, J., Connor, R., Tyack, P. & Whitehead, H. (ed.). Cetacean Societies. The University of Chicago Press. p. 169. ISBN 0-226-50341-0.{{cite book}}: CS1 maint: multiple names: authors list (link)
  48. ^ Whitehead, H. (2003). "Mating Systems". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 271–285. ISBN 0-226-89518-1.
  49. ^ Pitman RL, Ballance LT, Mesnick SI, Chivers SJ (2001). "Killer whale predation on sperm whales: Observations and implications". Marine Mammal Science. 17 (3): 494–507. doi:10.1111/j.1748-7692.2001.tb01000.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  50. ^ Whitehead, H. & Weilgart, L. (2000). "The Sperm Whale". In Mann, J., Connor, R., Tyack, P. & Whitehead, H. (ed.). Cetacean Societies. The University of Chicago Press. p. 165. ISBN 0-226-50341-0.{{cite book}}: CS1 maint: multiple names: authors list (link)
  51. ^ Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
  52. ^ Estes, J. (2006). Whales, Whaling, and Ocean Ecosystems. University of California Press. p. 179. ISBN 0520248848. Retrieved 2008-11-03.
  53. ^ a b Whitehead, H. (2003). "Vertical Movements: The Sperm Whale's Dive". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. p. 79. ISBN 0-226-89518-1.
  54. ^ a b Whitehead, H. (2003). "The Diet of a Sperm Whale: The Walnut, the Pea and the Half-Pound Steak". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 43–55. ISBN 0-226-89518-1.
  55. ^ Smith S. & Whitehead, H. (2000). "The Diet of Galapagos sperm whales Physeter macrocephalus as indicated by fecal sample analysis". Marine Mammal Science. 16 (2): 315–325. doi:10.1111/j.1748-7692.2000.tb00927.x.
  56. ^ Perkins, S. "Sperm Whales Use Teamwork to Hunt Prey". Retrieved 2010-02-24.
  57. ^ Gaskin D. & Cawthorn M. (1966). "Diet and feeding habits of the sperm whale (Physeter macrocephalus L.) in the Cook Strait region of New Zealand". New Zealand Journal of Marine and Freshwater Researchvolume=2: 156–179.
  58. ^ a b "Sneaky Cetaceans". Arctic Science Journeys. Retrieved 2008-11-04.
  59. ^ "Whale Buffet". Archived from the original on 2007-02-07. Retrieved 2007-03-19.
  60. ^ http://www.flmnh.ufl.edu/fish/Sharks/Megamouth/Mega13.htm
  61. ^ Compagno, L. J. V. (2001). Sharks of the World Volume 2 Bullhead, mackerel and carpet sharks (PDF). FAO Species Catalogue for Fishery Purposes. pp. 74–78.
  62. ^ Dannenfeldt K.H. (1982). "Ambergris: The Search for Its Origin". Isis. 73 (3): 382–397. doi:10.1086/353040. PMID 6757176.
  63. ^ Ellis, R. (1994). Monsters of the Sea. The Lyons Press. p. 245. ISBN 1592289673.
  64. ^ a b c d e Bianucci, G. & Landini, W. (September 8, 2006). "Killer sperm whale: a new basal physeteroid (Mammalia, Cetacea) from the Late Miocene of Italy". Zoological Journal of the Linnean Society. 148 (1): 103–131. doi:10.1111/j.1096-3642.2006.00228.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  65. ^ Møhl, B., Wahlberg, M., Madsen, P. T., Heerfordt A. and Lund A. (August 2003). "The monopulsed nature of sperm whale clicks". The Journal of the Acoustical Society of America. 114 (2): 1143–1153. doi:10.1121/1.1586258.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  66. ^ Benoit-Bird K. Au W. & Kastelein R. (August 2006). "Testing the odontocete acoustic prey debilitation hypothesis: No stunning results". The Journal of the Acoustical Society of America. 120 (2): 1118–1123. doi:10.1121/1.2211508. PMID 16938998.
  67. ^ Mead, J. G.; Brownell, R. L. Jr. (2005). "Order Cetacea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 723–743. ISBN 978-0-8018-8221-0. OCLC 62265494.
  68. ^ a b c d Lambert, O., Bianucci, G. & de Muizon, C. (August 2008). "A new stem-sperm whale (Cetacea, Odontoceti, Physeteroidea) from the Latest Miocene of Peru". Comptes Rendus Palevol. 7 (6): 361–369. doi:10.1016/j.crpv.2008.06.002.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  69. ^ Template:La icon Linnaeus, Carolus (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Holmiae. (Laurentii Salvii). p. 824.
  70. ^ a b Fordyce, R.E., and Barnes, L.G. (May 1994). "The Evolutionary History of Whales and Dolphins" (PDF). Annual Review of Earth and Planetary Sciences. 22: 419–455. doi:10.1146/annurev.ea.22.050194.002223. Retrieved 2008-10-04.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  71. ^ Stucky, R.E. and McKenna, M.C. (1993). "Mammalia". In Benton, M.J. (ed.). The Fossil Record. London.: Chapman & Hall. pp. 739–771.{{cite book}}: CS1 maint: multiple names: authors list (link)
  72. ^ a b c d e f g Mchedlidze. G. A. (2002). "Sperm whales, evolution". In Perrin, W. F., Würsic, B. & Thewissen, J. G. M. (ed.). Encyclopedia of Marine Mammals. Academic Press, San Diego. pp. 1172–1174. ISBN 0-12-551340-2.{{cite book}}: CS1 maint: multiple names: editors list (link)
  73. ^ a b Hirota, K. & Barnes, L. G. (April 5, 2006). "A new species of Middle Miocene sperm whale of the genus Scaldicetus (Cetacea; Physeteridae) from Shiga-mura, Japan". Island Arc. 3 (4): 453–472. doi:10.1111/j.1440-1738.1994.tb00125.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  74. ^ Bianucci, G., Landrini, W. & Varola, W. (September–October 2004). "First discovery of the Miocene northern Atlantic sperm whale Orycterocetus in the Mediterranean". Geobios. 37 (5): 569–573. doi:10.1016/j.geobios.2003.05.004.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  75. ^ a b c Nikaido, M., Matsuno, F., Hamilton, H., Brownwell, R., Cao, Y., Ding, W., Zuoyan, Z., Shedlock, A., Fordyce, R. E., Hasegawa, M. & Okada, N. (June 19, 2001). "Retroposon analysis of major cetacean lineages: The monophyly of toothed whales and the paraphyly of river dolphins". Proceedings of the National Academy of Sciences of the United States of America. 98 (13): 7384–7389. doi:10.1073/pnas.121139198. PMC 34678. PMID 11416211. Retrieved 2008-11-01.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  76. ^ a b Whitehead, H. (2003). "Evolutionary History of the Sperm Whale". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 2–3. ISBN 0-226-89518-1.
  77. ^ Heyning, J. (August 23, 2006). "Sperm Whale Phylogeny Revisited: Analysis of the Morphological Evidence". Marine Mammal Science. 13 (4): 596–613. doi:10.1111/j.1748-7692.1997.tb00086.x.
  78. ^ Wilson, D. (1999). The Smithsonian Book of North American Mammals. Vancouver: UBC Press. p. 300. ISBN 0774807628.
  79. ^ The Southampton Oceanography Centre & A deFontaubert. "The status of natural resources on the high seas" (PDF). IUCN. p. 63. Retrieved 2008-10-11.
  80. ^ Jamieson, A. (1829). A Dictionary of Mechanical Science, Arts, Manufactures, and Miscellaneous Knowledge. H. Fisher, Son & Co. p. 566.
  81. ^ "Aquarium of the Pacific - Sperm Whale". Retrieved 2008-10-11.
  82. ^ Whitehead, H. (2003). "Sperm Whales and Humans". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. p. 14. ISBN 0-226-89518-1.
  83. ^ Simons, B. "Christopher Hussey Blown Out (Up) to Sea". Nantucket Historical Association.
  84. ^ Dudley, P. (1725). "An Essay upon the Natural History of Whales, with a Particular Account of the Ambergris Found in the Sperma Ceti Whale". Philosophical Transactions (1683-1775), Vol. 33. The Royal Society. p. 267.
  85. ^ a b Dolin, E. (2007). Leviathan: The History of Whaling in America. W. W. Norton. pp. 98–100. ISBN 0393060578.
  86. ^ Starbuck, A. (1878). History of the American Whale Fishery from its Earliest Inception to the Year 1876. ISBN 066535343X.
  87. ^ a b c Bockstoce, J. (December 1984). "From Davis Strait to Bering Strait: The Arrival of the Commercial Whaling Fleet in North America's West Arctic" (PDF). Arctic. 37 (4): 528–532.
  88. ^ Estes, J. (2006). Whales, Whaling, and Ocean Ecosystems. University of California Press. p. 329. ISBN 0520248848.
  89. ^ a b Whitehead, H. (2003). "Sperm whales and humans". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 13–21. ISBN 0-226-89518-1.
  90. ^ Stackpole, E. A. (1972). Whales & Destiny: The Rivalry between America, France, and Britain for Control of the Southern Whale Fishery, 1785-1825. The University of Massachusetts Press. ISBN 0870231049.
  91. ^ Baldwin, R., Gallagher, M., and van Waerebeek, K. "A Review of Cetaceans from Waters off the Arabian Peninsula" (PDF). p. 6. Retrieved 2008-10-15.{{cite web}}: CS1 maint: multiple names: authors list (link)
  92. ^ "The Wreck of the Whaleship Essex". BBC. Retrieved 2008-10-11.
  93. ^ Davis, L, Gallman, R. & Gleiter, K. (1997). In Pursuit of Leviathan: Technology, Institutions, Productivity, and Profits in American Whaling, 1816-1906 (National Bureau of Economic Research Series on Long-Term Factors in Economic Dev). University of Chicago Press. p. 135. ISBN 0226137899.{{cite book}}: CS1 maint: multiple names: authors list (link)
  94. ^ Over 680,000 officially reported at "Whaling Statistics". Retrieved 2008-10-15.. In addition, studies have found that official reports understated USSR catches by at least 89,000 "Sperm Whale (Physeter macrocephalus) California/Oregon/Washington Stock" (PDF). Retrieved 2008-10-16.. Furthermore, other countries, such as Japan have been found to have understated catches "The RMS - A Question of Confidence: Manipulations and Falsifications in Whaling" (PDF). Retrieved 2008-10-16.
  95. ^ Lavery, Trish L., Ben Roudnew, Peter Gill, Justin Seymour, Laurent Seuront, Genevieve Johnson, James G. Mitchell & Victor Smetacek (2010). "Iron defecation by sperm whales stimulates carbon export in the Southern Ocean". Proceedings of the Royal Society B. 277 (1699): 3527–3531. doi:10.1098/rspb.2010.0863. PMC 2982231. PMID 20554546.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  96. ^ Whitehead, H. (2003). "Ghosts of Whaling Past". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 360–362. ISBN 0-226-89518-1.
  97. ^ Whitehead, H. (2003). "New Threats to Sperm Whales". Sperm Whales Social Evolution in the Ocean. University of Chicago Press. pp. 362–368. ISBN 0-226-89518-1.
  98. ^ "Sperm whale (Physeter catodon) species profile". Environmental Conservation Online System. United States Fish and Wildlife Service. November 16, 2010.
  99. ^ "Museum of New Zealand Te Papa Tongarewa Collections Online Search - Rei puta". Retrieved 2009-03-15.
  100. ^ Arno, A. (2005). "Cobo and tabua in Fiji: Two forms of cultural currency in an economy of sentiment". American Ethnologist. 32 (1): 46–62. doi:10.1525/ae.2005.32.1.46. Retrieved 2008-10-06.
  101. ^ Ratzel, Friedrich. "Dress and Weapons of the Melanesians: Ornament", The History of Mankind. (London: MacMillan, 1896). Accessed 21 October 2009.
  102. ^ Constantine, R. (2002). "Folklore and Legends". In Perrin, W., Würsig, B. & Thewissen, J. (ed.). Encyclopedia of Marine Mammals. Academic Press. p. 449. ISBN 0-12-551340-2.{{cite book}}: CS1 maint: multiple names: editors list (link)
  103. ^ "Chapter 3. Romances of Adventure. Section 2. Herman Melville. Van Doren, Carl. 1921. The American Novel". Bartleby.com. Retrieved 2008-10-19.
  104. ^ a b Zwart, H. (2000). What is a Whale? Moby Dick, marine science and the sublime (PDF). Tubingen Attempo. pp. 185–214. {{cite book}}: |journal= ignored (help)
  105. ^ Edwards, B. "The Playful Learnings" (PDF). Australasian Journal of American Studies: 140. {{cite journal}}: More than one of |pages= and |page= specified (help)
  106. ^ "The State Animal" (Document). Reproduced from the Connecticut State Register & Manual: State of ConnecticutTemplate:Inconsistent citations {{cite document}}: External link in |place= (help); Unknown parameter |accessdate= ignored (help); Unknown parameter |url= ignored (help); Unknown parameter |work= ignored (help)CS1 maint: location (link) CS1 maint: postscript (link)
  107. ^ "Whale and dolphin watching in the Azores". Wildlife Extra. Retrieved 2008-09-26.
  108. ^ "Whale Watching Dominica". Retrieved 2008-09-26.
  109. ^ Husson A.M., Holthuis L.B. (1974). "Physeter macrocephalus Linnaeus, 1758, the valid name for the sperm whale". Zoologische Mededelingen. 48: 205–217.
  110. ^ Holthuis L. B. (1987). "The scientific name of the sperm whale". Marine Mammal Science. 3 (1): 87–89. doi:10.1111/j.1748-7692.1987.tb00154.x.
  111. ^ Schevill W.E. (1986). "The International Code of Zoological Nomenclature and a paradigm: the name Physeter catodon Linnaeus 1758". Marine Mammal Science. 2 (2): 153–157. doi:10.1111/j.1748-7692.1986.tb00036.x.
  112. ^ Schevill W.E. (1987). "Reply to L. B. Holthuis "The scientific name of the sperm whale". Marine Mammal Science. 3 (1): 89–90.
  113. ^ Whitehead, H. (2003). Sperm Whales Social Evolution in the Ocean. University of Chicago Press. p. 3. ISBN 0-226-89518-1.

References

Further reading

  • Heptner, V. G.; Nasimovich, A. A; Bannikov, Andrei Grigorevich; Hoffmann, Robert S, Mammals of the Soviet Union, Volume II, part 3 (1996). Washington, D.C. : Smithsonian Institution Libraries and National Science Foundation
Wikimedia Commons has media related to Physeter macrocephalus.
Wikispecies has information related to Physeter macrocephalus.

Template:Link GA Template:Link FA Template:Link FA Template:Link FA Template:Link FA

Retrieved from "https://en.wikipedia.org/w/index.php?title=Sperm_whale&oldid=437662570"