Increases in glucocorticoids are sufficient but not necessary to increase cooperative burrowing in Damaraland mole-rats.


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Authors
Vullioud, Philippe 
Clutton-Brock, Timothy  ORCID logo  https://orcid.org/0000-0001-8110-8969
Mendonca, Rute 
Glauser, Gaetan 
Bennett, Nigel 
Abstract

Despite widespread interest in the evolution of cooperative behaviour, the physiological mechanisms shaping their expression remain elusive. We tested the hypothesis that glucocorticoid (GC) hormones affect cooperative behaviour using captive Damaraland mole-rats (Fukomys damarensis), a cooperatively breeding mammal. Within groups, individuals routinely contribute to public goods that include foraging tunnels, which provide all group members access to the tubers of desert plants they feed on, communal food stores and nests. We found that experimental increases in glucocorticoid concentration (GCc) in non-breeding female helpers led them to be active for longer and to burrow more while active, raising their daily contributions to burrowing, but not food carrying or nest building. However, experimentally induced increases in burrowing did not lead to elevated GCc in helpers of both sexes. These results suggest that heightened GCc may stimulate some cooperative behaviours that are energetically demanding (a characteristic shared by many types of cooperative activities across species) but that the cooperative behaviours affected by GCc can also be regulated by other mechanisms.

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Keywords
Journal Title
Hormones and Behaviour
Conference Name
Journal ISSN
0018-506X
Volume Title
135
Publisher
Elsevier
Sponsorship
European Research Council (742808)
European Research Council