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No task specialization among helpers in Damaraland mole-rats
Univ Cambridge, UK.;Kuruman River Reserve, South Africa.
Kuruman River Reserve, South Africa;Univ Neuchatel, Switzerland.
Univ Cambridge, UK;Kuruman River Reserve, South Africa.
Kuruman River Reserve, South Africa.
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2018 (English)In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 143, p. 9-24Article in journal (Refereed) Published
Abstract [en]

The specialization of individuals in specific behavioural tasks is often attributed either to irreversible differences in development, which generate functionally divergent cooperative phenotypes, or to agerelated changes in the relative frequency with which individuals perform different cooperative activities; both of which are common in many insect caste systems. However, contrasts in cooperative behaviour can take other forms and, to date, few studies of cooperative behaviour in vertebrates have explored the effects of age, adult phenotype and early development on individual differences in cooperative behaviour in sufficient detail to discriminate between these alternatives. Here, we used multinomial models to quantify the extent of behavioural specialization within nonreproductive Damaraland mole-rats, Fukomys damarensis, at different ages. We showed that, although there were large differences between individuals in their contribution to cooperative activities, there was no evidence of individual specialization in cooperative activities that resembled the differences found in insect societies with distinct castes where individual contributions to different activities are negatively related to each other. Instead, individual differences in helping behaviour appeared to be the result of age-related changes in the extent to which individuals committed to all forms of helping. A similar pattern is observed in cooperatively breeding meerkats, Suricata suricatta, and there is no unequivocal evidence of caste differentiation in any cooperative vertebrate. The multinomial models we employed offer a powerful heuristic tool to explore task specialization and developmental divergence across social taxa and provide an analytical approach that may be useful in exploring the distribution of different forms of helping behaviour in other cooperative species. (C) 2018 The Authors. Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 143, p. 9-24
Keywords [en]
Bathyergidae, eusociality, social niche specialization, task allocation, totipotency, trade-offs
National Category
Ecology
Research subject
Natural Science, Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-77720DOI: 10.1016/j.anbehav.2018.07.004ISI: 000443386600002Scopus ID: 2-s2.0-85051142858OAI: oai:DiVA.org:lnu-77720DiVA, id: diva2:1248067
Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-08-29Bibliographically approved

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Zöttl, Markus

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