Species identification of crested gibbons(Nomascus) in captivity in China using

本文刊于:《Zoological Research》 2018年第5期

关键词:
F2 hybrid gibbon;Fluorescence in situ hy

Keywords
F2 hybrid gibbon;Fluorescence in situ hybridization;Nomascus;Pericentric inversion;Species identification;Animal welfare
摘要
     Gibbons and siamangs(Hylobatidae) are wel-known for their rapid chromosomal evolution, which has resulted in high speciation rate within the family. On the other hand, distinct karyotypes do not prevent speciation,allowing interbreeding between individuals in captivity,and the unwanted hybrids are ethical y problematic as al gibbon species are endangered or critical y endangered.Thus, accurate species identification is crucial for captive breeding, particularly in China where studbooks are unavailable. Identification based on external morphology is difficult, especially for hybrids, because species are usually similar in appearance. In this study, we employed G-banding karyotyping and fluorescence in situ hybridization(FISH) as well as a PCR-based approach to examine karyotypic characteristics and identify crested gibbons of the genus Nomascus from zoos and nature reserves in China. We characterized and identified five karyotypes from 21 individuals of Nomascus. Using karyotypes and mitochondrial and nuclear genes, we identified three purebred species and three hybrids, including one F2 hybrid between N.gabriellae and N. siki. Our results also supported that N. leucogenys and N. siki shared the same inversion on chromosome 7, which resolves arguments from previous studies. Our results demonstrated that both karyotyping and DNA-based approaches were suitable for identifying purebred species, though neither was ideal for hybrid identification. The advantages and disadvantages of both approaches are discussed. Our results further highlight the importance of animal ethics and welfare,which are critical for endangered species in captivity.


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