63 Result(s)
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Article
Peter M Kappeler
Zoology
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Article
Open AccessStillbirth of a mandrill (Mandrillus sphinx) in the wild: perinatal behaviors and delivery sequences
Birth is a fundamental event in the life of animals, including our own species. More reports of wild non-human primate births and stillbirths are thus needed to better understand the evolutionary pressures sha...
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Open AccessDrivers and consequences of female reproductive competition in an egalitarian, sexually monomorphic primate
Even after the 150th anniversary of sexual selection theory, the drivers and mechanisms of female sexual selection remain poorly studied. To understand demographic circumstances favoring female-female competit...
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Open AccessInterrelationship among spatial cohesion, aggression rate, counter-aggression and female dominance in three lemur species
How social and ecological factors are associated with variation in dominance style across species of animals has been studied frequently, but the underlying processes are often not addressed. Theoretical resea...
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Open AccessHonest signaling in mouse lemur vocalizations?
Animal vocalizations may provide information about a sender’s condition or motivational state and, hence, mediate social interactions. In this study, we examined whether vocalizations of gray mouse lemurs (Microc...
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Open AccessQuantifying within-group variation in sociality—covariation among metrics and patterns across primate groups and species
It has long been recognized that the patterning of social interactions within a group can give rise to a social structure that holds very different places for different individuals. Such within-group variation...
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Infant Development and Maternal Care in Wild Verreaux’s Sifaka (Propithecus verreauxi)
Investigating factors influencing infant physical and social development is important to elucidate primate adaptations and life history evolution. Infant sifakas exhibit a puzzling mismatch between dental prec...
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Open AccessMaternal stress effects on infant development in wild Verreaux's sifaka (Propithecus verreauxi)
Maternal effects mediated by nutrients or specific endocrine states of the mother can affect infant development. Specifically, pre- and postnatal maternal stress associated with elevated glucocorticoid (GC) ou...
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Open AccessNeophobia and social facilitation in narrow-striped mongooses
Social learning is widespread in the animal kingdom, but individuals can differ in how they acquire and use social information. Personality traits, such as neophobia, may, for example, promote individual learn...
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Open AccessLinking ecology and cognition: does ecological specialisation predict cognitive test performance?
Variation in cognitive abilities is thought to be linked to variation in brain size, which varies across species with either social factors (Social Intelligence Hypothesis) or ecological challenges (Ecological In...
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Water Availability Impacts Habitat Use by Red-Fronted Lemurs (Eulemur rufifrons): An Experimental and Observational Study
With the predicted increase in extreme weather events as a result of global climate change, animals living in dry or seasonally dry habitats are likely to experience dramatic fluctuations in water availability...
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Fecal contamination, parasite risk, and waterhole use by wild animals in a dry deciduous forest
Waterholes are critically important to animal survival in dry habitats but are also a potential source of parasite exposure. Avoiding feces may effectively reduce parasite transmission risk, but may also impos...
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Open AccessOne size fits all? Relationships among group size, health, and ecology indicate a lack of an optimal group size in a wild lemur population
Group size is a key component of sociality and can affect individual health and fitness. However, proximate links explaining this relationship remain poorly understood, partly because previous studies neglecte...
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Social complexity: patterns, processes, and evolution
Animal and human societies exhibit extreme diversity in the size, composition and cohesion of their social units, in the patterning of sex-specific reproductive skew, in the nature of parental care, in the for...
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Open AccessClarifying and expanding the social complexity hypothesis for communicative complexity
Variation in communicative complexity has been conceptually and empirically attributed to social complexity, with animals living in more complex social environments exhibiting more signals and/or more complex ...
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Open AccessA framework for studying social complexity
Social complexity has been one of the recent emerging topics in the study of animal and human societies, but the concept remains both poorly defined and understood. In this paper, I critically review definitio...
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Genetic polymorphism and structure of wild and zoo populations of the fosa (Eupleridae, Carnivora), the largest living carnivoran of Madagascar
Cryptoprocta ferox, or fosa, is the largest living endemic carnivoran of Madagascar, with presumably high dispersal capacity, and for which no broad scale phylogeographic study has been conducted to date. This sp...
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Potential self-medication using millipede secretions in red-fronted lemurs: combining anointment and ingestion for a joint action against gastrointestinal parasites?
Self-anointing, referring to the behaviour of rubbing a material object or foreign substance over different parts of the body, has been observed in several vertebrate species, including primates. Several funct...
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Gregarious sexual segregation: the unusual social organization of the Malagasy narrow-striped mongoose (Mungotictis decemlineata)
Sex-specific costs and benefits of sociality are rarely evaluated, even though the main fitness determinants differ between the sexes. The Carnivora include some of the few mammalian species in which the sexes...
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Open AccessIntergroup encounters in Verreaux’s sifakas (Propithecus verreauxi): who fights and why?
Individuals living in groups have to achieve collective action for successful territorial defense. Because conflicts between neighboring groups always involve risks and costs, individuals must base their decis...
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The Evolution of Eulemur Social Organization
Recent comparative studies on the evolution of mammalian sociality came to opposite conclusions regarding the direction and drivers of evolutionary transitions in social organization, particularly concerning t...
