Evidence for loss of nepotism in the evolution of permanent sociality

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DOI

  • Reut Berger-Tal
  • ,
  • Yael Lubin, Ben Gurion Univ Negev, Ben Gurion University, Blaustein Inst Desert Res, Mitrani Dept Desert Ecol
  • ,
  • Virginia Settepani
  • Marija Majer
  • ,
  • Trine Bilde
  • Cristina Tuni

Kin selected benefits of cooperation result in pronounced kin discrimination and nepotism in many social species and favour the evolution of sociality. However, low variability in relatedness among group members, infrequent competitive interactions with non-relatives, and direct benefits of cooperation may relax selection for nepotism. We tested this prediction in a permanently social spider, Stegodyphus dumicola that appears to fulfil these conditions. Sociality is a derived trait, and kin discrimination exists in sub-social closely related congeners and is likely a selective force in the sub-social route to permanent sociality in spiders. We examined whether social spiders show nepotism in cooperative feeding when genetic relatedness among group members was experimentally varied. We found no effect of relatedness on feeding efficiency, growth rate or participation in feeding events. Previous studies on sub-social species showed benefits of communal feeding with kin, indicating nepotistic cooperation. The lack of evidence for nepotism in the social species suggests that kin discrimination has been lost or is irrelevant in communal feeding. Our results are consistent with the hypothesis that the role of nepotism is diminished when cooperation evolves in certain genetic and ecological contexts, e.g. when intra-group genetic relatedness is homogeneous and encounters with competitors are rare.

Original languageEnglish
Article number13284
JournalScientific Reports
Volume5
Number of pages10
ISSN2045-2322
DOIs
Publication statusPublished - 3 Sep 2015

    Research areas

  • SPIDER STEGODYPHUS-DUMICOLA, ANELOSIMUS-EXIMIUS ARANEAE, KIN RECOGNITION, SUBSOCIAL SPIDER, GENETICAL EVOLUTION, COOPERATION, ERESIDAE, SOCIETIES, THERIDIIDAE, DISPERSAL

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