Watts studies of mountain gorillas (; Zoo Biology —) The North American Regional Gorilla Studbook is designed to be a tool. Launched on August 21st , Gorillas Land is a webpage created by three gorillas the official Gorilla Studbook and the unofficial Jim Davis’ Studbook. 1 North American Studbook for the Western Lowland Gorilla (Gorilla gorilla gorilla) Regional Studbook Keeper: Dan Wharton, Ph. D Chicago Zoological Society.
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Gorilla gorilla gorilla, the western lowland gorilla of Cameroon, Central African Republic, Gabon, Congo, and Equatorial Guinea, the subspecies most represented in captivity.
All but one specimen of the current Gorilla gorilla graueri, the eastern lowland gorilla of eastern Zaire is represented in captivity by a few specimens with several in Europe and a single, aged specimen in North America. Gorilla gorilla beringei or mountain gorilla of the high, montane border region of Rwanda, Zaire and Uganda is not represented in captivity at all.
Gorilla gorilla diehli, This a subspecies from the past now given scientific validity through recent studies Sarmiento and Oates, ; American Museum Novitates Known as the Cross River Gorilla, it inhabits lowland and submontane forest in the upper Cross River region on the Nigeria-Cameroon border, about km north of the range of the western lowland gorilla.
This is considered the most threatened of the gorilla subspecies with an estimated animals remaining. The western lowland subspecies is the most numerous in the tens of thousands. As a large, specialized vertebrate, this species as a whole is considered vulnerable to drastic, decline due to political and ecological uncertainty over much of its range.
Social Structure and Mating System Gorillas are social animals, usually living in polygamous groups of 5 20 animals including juveniles.
Bachelor males are known to live alone or in groups of two or more awaiting the opportunity to take over female bands or start new bands with transferring females. Watts studies of mountain gorillas ; Zoo Biology 3: Young females very often leave their natal groups to join other groups or bachelor stdbook.
North American Studbook for the Western Lowland Gorilla (Gorilla gorilla gorilla)
Female transfer appears to be motivated by 1 escape from low social status srudbook adult 1. Dominant male intolerance of sexual behavior in subordinate males is the major factor in male departure from natal groups.
Females may transfer one, two or more times in their lifetimes. The management of bachelor male gorillas in zoos has become more important in recent years as growth of the population entirely through captive breeding has resulted in an even sex ratio in the population. Important studies on male gorillas living in groups have greatly informed managers of gorillas on how best to accomplish compatible male groups.
These studies include the following: Urinary androgen and corticoid levels in captive male lowland gorillas: Age- and studbopk group-related differences. American Journal of Primatology Thanks to remarkable cooperation among nearly 50 North American zoos, the Gorilla SSP has directed hundreds of animal transfers since with the goal of forming larger, more natural and better adjusted social groupings for gorillas of all ages including infants. During the same period, the North American captive population experienced a higher birthrate and moved from a negative to a positive growth trend.
It should be used as a supplement to the International Studbook for the Gorilla managed by Frankfurt Zoological Garden. The International Studbook includes many comments not included in the North American version as well as a report of all captive gorillas worldwide, living and dead. It should be noted that studbook numbers used in the International and Regional editions are identical for all practical purposes.
The International Studbook uses a dual numbering system gorrilla captive-bred animals whereas the North American Regional Studbook uses a single number, the primary number assigned by the International Studbook keeper. Kristen Lukas, the Wildlife Conservation Society and the Chicago Zoological Society, all for their valuable contributions to the production of this edition.
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