A contact-based social network of lizards is defined by low genetic relatedness among strongly connected individuals

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2014
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Godfrey, Stephanie S.
Ansari, Talat Hojat
Gardner, Michael G.
Bull, C. Michael
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Animal Behaviour. 2014, 97, pp. 35-43. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2014.08.019
Zusammenfassung

Social organization is widespread; even largely solitary species must organize themselves to enable contacts with mates and reduce competition with conspecifics. Although the forms of social structure can be subtle in solitary species, understanding the factors that influence them may be important for understanding how different forms of social organization evolved. We investigated the influence of genetic relatedness and spatial structure on social associations in a solitary living Australian scincid lizard, Tiliqua rugosa. We derived the genetic relatedness of 46 lizards from analysis of genotypes at 15 microsatellite DNA loci, and described social networks from GPS locations of all the lizards every 10 min for 81 days during their main activity period of the year. We found that connected male dyads were significantly more related than expected by chance, whereas connected male–female and female–female dyads had lower relatedness than expected. Among neighbouring male–male and male–female dyads, the strongest social relationships were between lizards that were the least related. Explanations of this pattern may include the avoidance of inbreeding in male–female dyads, or the direction of aggressive behaviour towards less related individuals in male–male dyads. Observed social associations (inferred through synchronous spatial proximity) were generally lower than expected from null models derived from home range overlap, and many close neighbours did not make social contact. This supports our hypothesis for the presence of deliberate avoidance between some neighbouring individuals. We suggest that lizards can discriminate between different levels of relatedness in their neighbours, directing their social interactions towards those that are less related. This highlights differences in how social associations are formed between species that are solitary (where associations form between unrelated conspecifics) and species that maintain stable social groups structured by kinship.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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lizard, male-male interactions, pair bond, relatedness, Scincidae, social network, space use
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ISO 690GODFREY, Stephanie S., Talat Hojat ANSARI, Michael G. GARDNER, Damien R. FARINE, C. Michael BULL, 2014. A contact-based social network of lizards is defined by low genetic relatedness among strongly connected individuals. In: Animal Behaviour. 2014, 97, pp. 35-43. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2014.08.019
BibTex
@article{Godfrey2014-11conta-42862,
  year={2014},
  doi={10.1016/j.anbehav.2014.08.019},
  title={A contact-based social network of lizards is defined by low genetic relatedness among strongly connected individuals},
  volume={97},
  issn={0003-3472},
  journal={Animal Behaviour},
  pages={35--43},
  author={Godfrey, Stephanie S. and Ansari, Talat Hojat and Gardner, Michael G. and Farine, Damien R. and Bull, C. Michael}
}
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