Abstract
The selective forces that drive the evolution of cooperation have been intensely debated. Evolutionary transitions to cooperative breeding, a complex form of cooperation, have been hypothesized to be linked to low degrees of promiscuity, which increases intragroup relatedness and the indirect (that is, kin selected) benefits of helping. However, ecological factors also promote cooperative breeding, and may be more important than relatedness in some contexts. Identifying the key evolutionary drivers of cooperative breeding therefore requires an integrated assessment of these hypotheses. Here we show, using a phylogenetic framework that explicitly evaluates mating behaviours and ecological factors, that evolutionary transitions to cooperative breeding in cichlid fishes were not associated with social monogamy. Instead, group living, biparental care and diet type directly favoured the evolution of cooperative breeding. Our results suggest that cichlid fishes exhibit an alternative path to the evolution of complex societies compared to other previously studied vertebrates, and these transitions are driven primarily by direct fitness benefits.
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Change history
13 February 2019
In the version of this Article originally published, references were missing from the column “Source(s) for mating and parental care system data” in Supplementary Table 1. The following references have now been added to the relevant species: Brichard 1989 has been added to Chalinochromis popelini, Chalinochromis brichardi and Julidochromis dickfeldi; Clabaut et al. 2007 to Altolamprologus calvus and Julidochromis regani; Konings 1998 to Neolamprologus hecqui; and Kuwamura 1997 to Chalinochromis popelini.
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Acknowledgements
We thank K. A. Garvy, J. K. Hellmann, I. Y. Ligocki, S. E. Marsh-Rollo, A. R. Reddon, J. Rozek, S. St-Cyr, J. Reynolds, M. Y. L. Wong, J. K. Desjardins, K. A. Stiver and N. Milligan for assistance with field data collection, and Zambian Department of Fisheries, University of Zambia in Lusaka, Tanganyika Science Lodge, and Kasakalawe Village for logistical support. We thank O. Leimar and H. Gante for helpful discussion and comments. Research was supported by the Natural Sciences and Engineering Research Council of Canada (C.M.O., C.J.D., S.B.), University of Manchester (H.W., J.L.F.), Hamilton Community Foundation (C.M.O.), Journal of Experimental Biology (C.M.O.), Ontario Innovation Trust (S.B.), Canadian Foundation for Innovation (S.B.) and Canada Research Chairs program (S.B.).
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C.J.D., C.M.O., S.S., S.B. and J.L.F. conceived the study; C.M.O., H.W., S.B. and J.L.F. collected the data; C.J.D., C.M.O., H.W., S.S. and J.L.F. analysed the data; C.J.D., C.M.O., S.B. and J.L.F. wrote the paper with input from the other authors.
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Dey, C., O’Connor, C., Wilkinson, H. et al. Direct benefits and evolutionary transitions to complex societies. Nat Ecol Evol 1, 0137 (2017). https://doi.org/10.1038/s41559-017-0137
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DOI: https://doi.org/10.1038/s41559-017-0137
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