Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.7/743
Título: Effective Population Size Dynamics and the Demographic Collapse of Bornean Orang-Utans
Autor: Sharma, Reeta
Arora, Natasha
Goossens, Benoit
Nater, Alexander
Morf, Nadja
Salmona, Jordi
Bruford, Michael W.
Van Schaik, Carel P.
Krützen, Michael
Chikhi, Lounès
Palavras-chave: Animals
Bayes Theorem
Likelihood Functions
Microsatellite Repeats
Models, Genetic
Pongo pygmaeus
Population Dynamics
Genetic Variation
Genetics, Population
Data: 15-Nov-2012
Editora: Public Library of Science
Citação: Sharma R, Arora N, Goossens B, Nater A, Morf N, et al. (2012) Effective Population Size Dynamics and the Demographic Collapse of Bornean Orang- Utans. PLoS ONE 7(11): e49429. doi:10.1371/journal.pone.0049429
Resumo: Bornean orang-utans experienced a major demographic decline and local extirpations during the Pleistocene and Holocene due to climate change, the arrival of modern humans, of farmers and recent commercially-driven habitat loss and fragmentation. The recent loss of habitat and its dramatic fragmentation has affected the patterns of genetic variability and differentiation among the remaining populations and increased the extinction risk of the most isolated ones. However, the contribution of recent demographic events to such genetic patterns is still not fully clear. Indeed, it can be difficult to separate the effects of recent anthropogenic fragmentation from the genetic signature of prehistoric demographic events. Here, we investigated the genetic structure and population size dynamics of orang-utans from different sites. Altogether 126 individuals were analyzed and a full-likelihood Bayesian approach was applied. All sites exhibited clear signals of population decline. Population structure is known to generate spurious bottleneck signals and we found that it does indeed contribute to the signals observed. However, population structure alone does not easily explain the observed patterns. The dating of the population decline varied across sites but was always within the 200-2000 years period. This suggests that in some sites at least, orang-utan populations were affected by demographic events that started before the recent anthropogenic effects that occurred in Borneo. These results do not mean that the recent forest exploitation did not leave its genetic mark on orang-utans but suggests that the genetic pool of orang-utans is also impacted by more ancient events. While we cannot identify the main cause for this decline, our results suggests that the decline may be related to the arrival of the first farmers or climatic events, and that more theoretical work is needed to understand how multiple demographic events impact the genome of species and how we can assess their relative contributions.
Peer review: yes
URI: http://hdl.handle.net/10400.7/743
DOI: 10.1371/journal.pone.0049429
Versão do Editor: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0049429
Aparece nas colecções:PCG - Artigos

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