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Setchell J.M.,Durham University | Huchard E.,Abteilung Verhaltensokologie und Soziobiologie
BioEssays | Year: 2010

Major histocompatibility complex (MHC)-associated mate choice is thought to give offspring a fitness advantage through disease resistance. Primates offer a unique opportunity to understand MHC-associated mate choice within our own zoological order, while their social diversity provides an exceptional setting to examine the genetic determinants and consequences of mate choice in animal societies. Although mate choice is constrained by social context, increasing evidence shows that MHC-dependent mate choice occurs across the order in a variety of socio-sexual systems and favours mates with dissimilar, diverse or specific genotypes non-exclusively. Recent research has also identified phenotypic indicators of MHC quality. Moreover, novel findings rehabilitate the importance of olfactory cues in signalling MHC genes and influencing primate mating decisions. These findings underline the importance to females of selecting a sexual partner of high genetic quality, as well as the generality of the role of MHC genes in sexual selection. Copyright © 2010 WILEY Periodicals, Inc.


Aquino R.,National Major San Marcos University | Cornejo F.M.,National Major San Marcos University | Pezo E.,University of the Amazon | Heymann E.W.,Abteilung Verhaltensokologie und Soziobiologie
Folia Primatologica | Year: 2013

The white-fronted spider monkey, Ateles belzebuth, is listed as 'Endangered' according to the IUCN classification. In Peru it is found in the departments of Loreto, San Martín, Amazonas and Cajamarca, but detailed data on its geographic distribution, population densities and conservation status are scarce. In order to obtain such information, we conducted transect censuses on the Río Aushiri and Río San Antonio (right bank of Río Napo), and between the Río Curaray and the Río Arabela and Río Nashiño, respectively, and made additional explorations on the northern and southern banks of the Río Marañón. We obtained 48 sightings along 761 km of census transect. Group size and population densities were lower in an area with high hunting pressure compared to areas with medium or low hunting pressure. Besides hunting, increasing deforestation is a major threat to the survival of A. belzebuth in Peruvian Amazonia. Copyright © 2012 S. Karger AG, Basel.


Muller B.,Abteilung Verhaltensokologie und Soziobiologie | Matz-Rensing K.,Abteilung Infektionspathologie | Yamacita J.G.P.,Abteilung Verhaltensokologie und Soziobiologie | Yamacita J.G.P.,University of the Amazon | Heymann E.W.,Abteilung Verhaltensokologie und Soziobiologie
European Journal of Wildlife Research | Year: 2010

An adult female red titi monkey (Callicebus cupreus) was found in a moribund state below a sleeping site at the Estación Biológica Quebrada Blanco in Peruvian Amazonia. Before death, the animal showed frequent convulsions. Post-mortem examination revealed the presence of Prosthenorchis elegans (Acanthocephala) in the small intestine. Major pathological findings concerned the digestive tract and the liver. Adult P. elegans provoked multifocal subacute to chronic enteritis with formation of ulcers in the small and large intestine. The liver revealed a severe chronic-active granulomatous hepatitis. While the cause of death could not be unambiguously identified, the infestation with P. elegans is likely to have played a key role in the pathogenesis of the chronic ulcerative enteritis and subsequent hepatitis; it possibly had a severe and long-term impact on the host's resource utilisation and defence against intruding pathogens and toxins of the digestive tract. The death of the animal is attributed to the chronic inflammatory processes in the digestive tract. © 2009 The Author(s).


Lledo-Ferrer Y.,Abteilung Verhaltensokologie und Soziobiologie | Lledo-Ferrer Y.,Autonomous University of Madrid | Pelaez F.,Autonomous University of Madrid | Heymann E.W.,Abteilung Verhaltensokologie und Soziobiologie
Folia Primatologica | Year: 2010

Mate guarding is a male strategy to monopolize matings and thus to ensure paternity. Since in callitrichids female reproductive status is advertised by scent marks, one may expect mate guarding by chemical means. We addressed this question during an episode of consortship observed in a polyandrous trio of wild saddleback tamarins (Saguinus fuscicollis). During consortship, the consort male was the only one to allomark the female. Scent marking frequency decreased for all individuals, although the consort male marked more than the other male during consortship, while there was no difference in the previous period. During consortship, almost 50% of female scents were overmarked by the consort, and more than 56% of the consort's scent marks were employed to overmark the female's scents. Therefore, the other male had limited access to female scent marks. Mate guarding may thus have a chemical component in tamarins, and olfactory communication may play an important role in mating competition. Copyright © 2010 S. Karger AG, Basel.

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