To send content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about sending content to .
To send content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about sending to your Kindle.
Note you can select to send to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Examining variation in social behaviour and associated endocrine physiology across groups of the same species can help identify consistent hormone–behaviour interactions. We investigated differences in urinary oxytocin levels of individuals, of two neighbouring chimpanzee groups related to (a) socio-positive and -negative interaction frequencies, (b) within-group cooperation associated with between-group competition and (c) group-specific differences in urinary oxytocin reactivity of individuals in response to the same behavioural contexts. We found higher rates of cooperative group-level behaviours and larger relative party sizes in East Group males, while South Group males had higher non-directed aggression and copulation rates. Individuals of both groups showed consistent urinary oxytocin reactivity after the same behavioural contexts. However, East Group males had higher urinary oxytocin levels across contexts than South Group males, including higher baseline levels. Our results support the oxytocinergic system’s involvement in cooperation and gregariousness, and suggest an association between group-specific social dynamics and oxytocinergic profiles.
A variety of studies have investigated endocrinological aspects of ecology, cooperation and immune system activation in Taï chimpanzees, making use of the ever-growing number of validated biomarkers used on non-invasive samples by the endocrinology laboratory at the MPI EVAN. In particular, the measurement of urinary oxytocin allows for insights into benefits of food-sharing, bonds and the potential physiological mechanism behind cooperation. Measures of urinary cortisol in combination with creatinine and C-peptide allow for the investigation of causes of seasonal variation in stress levels while patterns of immune system activation are monitored by the measurement of urinary neopterin. Future studies will profit from combined analysis of endocrine and immune parameters in relation to behaviour and reproductive success to investigate life-history trade-offs. Across-site comparisons of behaviour and endocrine patterns will help us to understand how variation in ecological and physiological parameters form the social setting of a population which leads to relatively low intergroup hostility, low leverage of males over females and relatively high levels of female sociality at Taï.
The Taï Chimpanzee Project (Taï National Park, Cote D'Ivoire) has yielded unprecedented insights into the nature of cooperation, cognition, and culture in our closest living relatives. Founded in 1979 by Christophe and Hedwige Boesch, the project has entered its 40th year of continuous research. Alongside other famous long-term chimpanzee study sites at Gombe and Mahale in East Africa, the tireless work of the team at Taï has contributed to the fields of behavioural ecology and anthropology, as well as improving public awareness of the urgent need to protect this already endangered species. Encompassing important research topics including chimpanzee ecology, reproductive behaviour, tool use, culture, communication, cognition and conservation, this book provides an engaging account of how Taï chimpanzees are adapted to African jungle life and how they have developed unique forms of cooperation with less violence, regular adoptions and complex cultural differences between groups.
Email your librarian or administrator to recommend adding this to your organisation's collection.