Juan Fernández fur seal
The Juan Fernández fur seal is the second smallest of the fur seals, second only to the Galápagos fur seal. They are found only on the Pacific Coast of South America, more specifically on the Juan Fernández Islands and the San Félix Islands. There is still much that is unknown about this species. Scientists still do not know the average life span of this species, or the diet and behavior of males apart from the breeding season.
|Juan Fernández fur seal|
|Juan Fernández fur seal range|
The Juan Fernandez fur seal is part of the group of eared seals. Fur seals in general have thick insulating fur that protects the skin from cold water, they have small ear flaps on the side of their head, and they hold their weight on their front flippers which are also used for land locomotion. Fur seals are different from true seals because they have the external ear flaps, but also true seals use their chest for support and movement, fur seals walk on their front flippers.
The Juan Fernandez fur seal is the second smallest fur seal, second only to the Galápagos fur seal. Their bodies are short and robust with brown pelage. Both the fore flippers and the hind flippers are relatively short, and the hind flippers have fleshy tips on the digits. Females are lighter brown and average 100 pounds and 4'6" long. Males are significantly larger and average 300 pounds and 6'6" in length. Males have thicker necks than females and have generally darker brown pelage. Male seals have golden tipped thick guard hairs on the back of the head, neck, and shoulders. This seal species has a trait called sexual dimorphism, meaning the males look much different from the females after reaching sexual maturity.
The Juan Fernández fur seal was discovered, and named by Juan Fernández in the mid 1500s. Once the seal was discovered the population was decimated by over hunting for the fur trade. It was believed that the Juan Fernández fur seal was extinct until a small group of 200 was found on the Juan Fernández islands in the 1960s. Now it is estimated that over 12,000 individuals exist today.
This particular seal lives a solitary life. Seals forage out at sea and haul out on rocky shores to rest. Females seem to be fairly particular about where she rests during the day and prefer tide pools and rocky caves. The resting areas that females prefer often become areas of male competition for breeding rights. Although females will typically rest in close regions, they are sure to be a few feet away from each other and never touch one another.
Breeding is a territorial process with the Juan Fernández fur seal, males will aggressively fight for access to female resting sights. This seal is polygynous, meaning that one male breeds with multiple females. Pups are born between November and December and are weaned off the mother's milk at 10 months of age. Mother's stay with the pups for about a week and then they leave to mate again and forage. Pups are born with soft black fur that fades to light brown within the first few years.
Not much is known about the diet of Juan Fernández fur seals, scientist have only observed the diet of lactating females that are caring for pups. What they have observed is that females forage out at sea sometimes as far as 300 miles off shore and will dive to depths of 30 to 300 feet to find lanternfish and squid. Typically lactating females will dive and forage at night when prey swims to shallow waters and become more accessible. Sometimes they will stay out at sea for up to 25 days, then return to shore and stay with the pups for 5 days.
During the period that the mothers are foraging the pup goes without milk for several days, sometimes weeks. To combat this, the mother's milk is high in fat and nutrients that the pup uses for energy while the mother is away. However, during this time the pups' immune systems are not as highly functioning as adults and can be prone to infection from intestinal parasites that leads to fatal infections. In the early 90s there were 60 pups discovered dead from hookworm infections, and also the presence of heavy metal ions were found in their systems. Such loss decimated the population and they are still recovering now.
- Reeves (et. al.), Randal (2002). Guide to Marine Mammals of the World. Andrew Stewart Publishing. pp. 69–71. ISBN 9780375411410.
- Aurioles, D. & Trillmich, F. (2008). "Arctocephalus philippii". IUCN Red List of Threatened Species. Version 2008. International Union for Conservation of Nature. Retrieved 30 January 2009.
- Osman, Layla P.; Moreno, Carlos A.; Trites, Andrew W. (2010-10-15). "Growth rates and differential investment in male and female Juan Fernández fur seal pups". Journal of Mammalogy. 91 (5): 1188–1196. doi:10.1644/09-MAMM-A-197.1. ISSN 0022-2372.
- Francis, John M.; Boness, Daryl J. (1991-11-01). "The Effect of Thermoregulatory Behaviour on the Mating System of the Juan Fernández Fur Seal, Arctocephalus philippii". Behaviour. 119 (1/2): 104–126. doi:10.1163/156853991x00391.
- Ochoa-Acuña, Hugo; Francis, John M.; Oftedal, Olav T. (1999-08-01). "Influence of Long Intersuckling Interval on Composition of Milk in the Juan Fernandez Fur Seal, Arctocephalus philippii". Journal of Mammalogy. 80 (3): 758–767. doi:10.2307/1383245.
- Sepúlveda, Maria Soledad (1998-12-01). "Hookworms (Uncinaria sp.) in Juan Fernandez Fur Seal Pups (Arctocephalus philippii) from Alejandro Selkirk Island, Chile". The Journal of Parasitology. 84 (6): 1305–1307. doi:10.2307/3284700.
- Sepúlveda, María S.; Ochoa-Acuña, Hugo; Sundlof, Stephen F. "Heavy metal concentrations in Juan Fernández fur seals (Arctocephalus philippii)". Marine Pollution Bulletin. 34 (8): 663–665. doi:10.1016/s0025-326x(97)00054-4.