Listening and watching: do camera traps or acoustic sensors more efficiently detect wild chimpanzees in an open habitat?Anne-Sophie Crunchant, David Borchers, Hjalmar Kuehl & Alex K. Piel
1. With one million animal species at risk of extinction, there is an urgent need to regularly monitor threatened species. However, in practice this is challenging, especially with wide-ranging, elusive and cryptic species or those that occur at low density. 2. Here we compare two non-invasive methods, passive acoustic monitoring (n=12) and camera trapping (n=53), to detect chimpanzees (Pan troglodytes) in a savanna-woodland mosaic habitat at the Issa Valley, Tanzania. With occupancy modelling we evaluate...
Better together? how intergroup associations affect energy balance and feeding behavior in wild bonobosStefano Lucchesi
When the benefits of interacting with out-group members exceed the associated costs, social groups may be expected to be tolerant towards each other. However, in many species exhibiting intergroup tolerance, the nature of benefits gained from intergroup encounters remains unclear. We investigated the potential costs and benefits associated with intergroup associations in bonobos, a species with varying degrees of intergroup tolerance, by testing whether these associations conferred energetic benefits to participants under different socioecological contexts,...
Chimpanzee identification and social Network construction through an online citizen science platformMaureen S McCarthy
Citizen science has grown rapidly in popularity in recent years due to its potential to educate and engage the public while providing a means to address a myriad of scientific questions. However, the rise in popularity of citizen science has also been accompanied by concerns about the quality of data emerging from citizen science research projects. We assessed data quality in the online citizen scientist platform Chimp&See, which hosts camera trap videos of chimpanzees (Pan...
Fission-fusion dynamics have evolved in a broad range of animal taxa and are thought to allow individuals to mitigate feeding competition. While this is the principal benefit of fission-fusion, few studies have evaluated its costs. We compared gregariousness, foraging budgets, and social budgets between lactating bonobos and chimpanzees from wild populations to evaluate such costs. Both species exhibit fission-fusion dynamics, but chimpanzees, particularly in East African populations, appear to experience higher feeding competition than bonobos....
Data from: Early maternal loss affects diurnal cortisol slopes in immature but not mature wild chimpanzeesCedric Girard-Buttoz, Patrick Tkaczynski, Liran Samuni, Pawel Fedurek, Cristina Gomes, Therese Löhrich, Virgile Manin, Anna Preis, Prince Valé, Tobias Deschner, Roman Wittig & Catherine Crockford
Biological embedding of stress experienced early in life is a mechanism proposed to explain the fitness costs of maternal loss in mammals. This embedding is expected to lead to long-term alterations of the hypothalamic pituitary adrenal (HPA) axis activity. This idea has, however, rarely been tested in wild long-lived animals. We assessed whether, as in humans, maternal loss had short and long-term impacts on orphan wild chimpanzee urinary cortisol levels and diurnal urinary cortisol slopes,...
Several theories have been generated to understand the socio-cognitive mechanisms underlying the unique cooperative abilities of humans. The “interdependence hypothesis” posits that the cognitive dimension of human cooperation evolved in contexts when several individuals needed to collaborate to achieve a common goal and that more interdependent individuals are more likely to cooperate (provide services to conspecifics) in non-collaborative contexts. Alternatively, the “social tolerance hypothesis” proposes that higher social tolerance allows conspecifics to cooperate more efficiently...
Palm fruit colours are linked to the broad-scale distribution and diversification of primate colour vision systemsRenske Onstein, Daphne Vink, Jorin Veen, Christopher Barratt, Suzette Flantua, Serge Wich & Daniel Kissling
A long-standing hypothesis in ecology and evolution is that trichromatic colour vision (the ability to distinguish red from green) in frugivorous primates has evolved as an adaptation to detect conspicuous (reddish) fruits. This could provide a competitive advantage over dichromatic frugivores which cannot distinguish reddish colours from a background of green foliage. Here, we test whether the origin, distribution and diversity of trichromatic primates is positively associated with the availability of conspicuous palm fruits, i.e....
Max Planck Institute for Evolutionary Anthropology7
Liverpool John Moores University4
George Washington University1
German Center for Integrative Biodiversity Research1
Robert Koch Institute1
Florida International University1
Max Planck Institute for Social Anthropology1
University of St Andrews1
University of Bergen1