Pastoralists rely on networks of cooperating households containing relatives and others to help with production and various other daily activities. To understand how socioecological differences and commonalities affect ...

Spatiotemporal reindeer population fluctuations are a result of multiple factors that working in concert affectingthe structure and functioning of many Arctic and Sub-Arctic ecosystems. We investigated the population ...

The asymmetric grandparental investment in humans may ultimately be explained by the paternity uncertainty hypothesis. The proximate mechanisms leading to grandparental bias in investment in grandchildren are, however, ...

Cooperative behaviors evolve by ultimately increasing the inclusive fitness of performers as well as recipients of those behaviors. Such increases can occur via direct or indirect fitness benefits, theoretically explained ...

Group living often entails a balance between individual selfinterest and benefits to the group as a whole. Situations in which an individual’s vested interests conflict with collective interests are known as social dilemmas ...

Kin relations have a strong theoretical and empirical basis for explaining cooperative behavior. Nevertheless, there is growing recognition that context—the cooperative environment of an individual—also shapes the willingness ...

The Tibetan nomads in the Aru Basin have until recently relied on hunting as an additional source forsubsistence. They hunted the endangered Tibetan antelope or chiru (Pantholops hodgsoni), blue sheep(Pseudois nayaur), ...