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Plasticity in extended phenotype increases offspring defence despite individual variation in web structure and behaviour

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Title: Plasticity in extended phenotype increases offspring defence despite individual variation in web structure and behaviour
Authors: DiRienzo, Nicholas Browse this author
Aonuma, Hitoshi Browse this author →KAKEN DB
Keywords: animal architecture
animal personality
extended phenotype
offspring defence
parental investment
Issue Date: Apr-2018
Publisher: Elsevier
Journal Title: Animal Behaviour
Volume: 138
Start Page: 9
End Page: 17
Publisher DOI: 10.1016/j.anbehav.2018.01.022
Abstract: Many animals actively defend their offspring using a range of behaviours from calling and mobbing in birds, to physical grappling in crustaceans, and the expression of these behaviours positively scale with offspring value. While this role of behaviour in defence is well studied, very little is known about how other traits, specifically the structure of architectural constructions such as webs and nests, contribute to offspring defence. Additionally, although some taxa show consistent individual differences in offspring defence behaviour, it is completely unknown whether individuals also differ in defensive structures. We addressed these questions in the redback spider, Latrodectus hasselti, by measuring how a female laying an eggcase influences female behaviour and web structure, and whether those traits scale with relative reproductive investment. Our results show that females modified web structure in response to an eggcase, but only the protective elements of web structure positively scaled with the relative value of that eggcase. Finally, despite the significant correlations, fixed effects (e.g. eggcase possession/value) in the models explained only 5-23% of the variation in behaviour and web structure, while the random effect of individual identity explained 46-65% of the variation. This variation drove moderate to high repeatability estimates across all traits, suggesting that some individuals consistently invest relatively more in defence, while some invest less. These results highlight that extended phenotypic traits may be a critical component of offspring defence in some taxa. Furthermore, individual variation in these traits suggest that different reproductive strategies may exist, whereby some individuals invest more in reproduction at a cost to safety/foraging and vice versa. (C) 2018 The Author(s). Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.
Rights: © 2018 Nicholas DiRienzo and Hitoshi Aonuma.
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 青沼 仁志

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