Jamaican fruit bat
|Jamaican fruit bat|
|Artibeus jamaicensis range|
The Jamaican, Common or Mexican fruit bat (Artibeus jamaicensis) is a fruit eating bat native to Central and South America, as well as the Greater and many of the Lesser Antilles. It is also an uncommon resident of the Southern Bahamas. Its distinctive features include the absence of an external tail and a minimal, U-shaped interfemoral membrane.
The Jamaican fruit bat is a medium-sized bat, having a total length of 78–89 mm with a 96–150 mm wingspan and weighing 40 to 60 g. It has broad but pointed and ridged ears with a serrated tragus. Its prominent noseleaf has an array sebaceous glands. The lower lip is littered with warts with a relatively large one in the center. Sebaceous holocrine glands can be found in both lips. On the back the fur is an ashy-shade of gray or brown with visible white hair bases. The wings of the fruit bat are broad and dark gray in color. The underfur is paler in color. The fruit bat has no external tail. It has broad dark grey wings and a narrow hairless interfemoral membrane with a short calcar.
The Jamaican fruit bat ranges from southern Mexico southward toto northwestern Argentina. It also lives on the islands of Trinidad, Tobago, Greater and Lesser Antilles and the Florida Keys. It can be found in elevations from sea level to 2,135m. This species is found in a variety of habitats. It prefers that are humid and tropical but has also adpated to cloud forests and drier tropical habitats. Fruit bats roost in caves, hollow trees, dense foliage, buildings and leaf tents. The fruit bat may create its own "tent" to roost in by altering broad leaves. These "tents" are only temporarily used.
The Jamaican fruit bat is a frugivore. They eat a number of kinds of fruit but focus mostly on figs; at Barro Colorado Island, Panama, figs make up more than 78% of the fruits eaten. Bats will also supplement leaves of plants with high amounts of protein. Overall, the fruit bat consumes a diverse amount of plants but locally only eats certain types. A Jamaican fruit-eating bat carries plucks of its food and carries it away with its mouth before eating it in its roosts. As such it can disperse seeds fairly far. Fruit bats have been recorded carrying fruits weighing of 3-14 g or even as much as 50 g. Jamaican fruit bats relys on sight and smell to find fruit of certain colors and odors.
The maximum longevity for the Jamaican fruit bat is nine years in the wild. Predators of fruits bats include owls, snakes, large oppossums, and coati. Bats from various sites have been found with Histoplasma capsulatum. Some individual bats may have rabies. Fruit also are susceptible to various internal parasites: nematodes and ringworms and external parasites: mites, ticks and chiggers.
Behavior and life history
When in their roosts, the Jamaican fruit bat has a reproductive system known as "resource defensive polygyny". That is, males will claim an area as a territory and females select the best territories to roost and mate in. Subadult males may remain in their natal roosts while females may leave to gather with other females elsewhere. In caves where there are enough roosting sites, some "female defensive polygyny". Here, harem males actively defend females during the breeding seasons and will attack satellite males that roost in the walls and ceilings of caves. However, they tolerate males who are subordinate to them in their harems. Satellite males are more common in large group than smaller groups and dominant and subordinates males will cooperative to defend harem females. In large groups, dominant males may be the fathers of the subordinates.
When bats going on foraging trips, it is the dominant males that are the first to leave to the roosting sites and the last to return. At dusk, males spend much time flying near the tree roosts displacing any intruders. Jamaican fruit bats are most active at midnight, following that, activity begins to die down.
When captured, a Jamaican fruit bat will warn conspecifics with a distress call made of a long series of pulses typically lasting 15 kHz. The Jamaican fruit bat will also react to the distress calls of other species and to their own recorded calls. The fruit bat is considered a whisper bat and makes 3 low-intensity FM pulses during flight and when resting.
Breeding in the Jamaican fruit bat that is bimodal and polyestrous with births being dependant on fruit abundance. Females give birth twice a year with one young on average for each birth. Mating is highest at the end of the wet season and births take place in the dry months. Embryonic development may delay in the second breeding season but parturition will occur in the follow breeding period. The testes of the males enlarge when females enter estrous. The testes tend to be slightly larger in harem males than bachelors and the canine teeth tend to be more worn in the former. Copulations occurs until 2–25 days after the previous births. Pups born in a harem may sometimes be sired by satellite or subordinate males depending on the size of the group. Gestation is usually 3.5–4 months but can be as long as 7 months when there's delayed embryonic development. The females gives births while perching and the newborn emergesm unaided, head first. The mothers will eat the placenta. Mothers carry their pups when they are one day old but later leave in the roosting area for the day. The female’s nipples become enlarged during lactation. Young are weaned by 15 days. Young gain a full, permanent set of teeth at 40 days and can fly by 50 days when their forearms are fully developed. Female are sexually mature by eight months and males by 12 months.
Throughout most of its range, the Jamaican fruit bat is numerous. It was found to be the most influential of the frugivorous bat community. The fruit bat has greater ecological importance in wet habitats. The Jamaican fruit eating bat does not seem to be threatened from a conservation standpoint. It appears to common regardless of any habitat disruption. However, it may damage fruit crops in certain areas.
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