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Mechanisms behind size-assortative nest choice by sand goby males in absence of intrasexual competition

Artikel i vetenskaplig tidskrift
Författare Johannes R. Björk
Charlotta Kvarnemo
Publicerad i Animal Behaviour
Volym 83
Nummer/häfte 1
Sidor 55-62
ISSN 0003-3472
Publiceringsår 2012
Publicerad vid Linnécentrum för marin evolutionsbiologi (CEMEB)
Institutionen för biologi och miljövetenskap
Sidor 55-62
Språk en
Länkar dx.doi.org/10.1016/j.anbehav.2011.0...
Ämneskategorier Etologi, Ekologi, Biologiska vetenskaper

Sammanfattning

Among nest-holding !sh, males often choose nest sites according to their own body size (i.e. size-assortative nest choice). In most cases, this can be explained by intrasexual competition. However, a few studies, for example on a marine population of the sand goby, Pomatoschistus minutus, have found a size-assortative nest preference, even when intrasexual competition is excluded. We conducted three aquarium experiments, using small sand goby males (47e54 mm) that were given either small (size-matched) or large (size-mismatched) nest sites, to test for potential mechanisms underlying this size-assortative nest choice in the absence of intrasexual competition. The three mechanisms investigated were (1) female preference, (2) paternal expenditure and (3) nest take-over. We did not, however, !nd any !tness advantages for sizematched males in any of the three experiments, suggesting that some other mechanism, such as defence against egg predators, is underlying this particular behaviour. Thus, further studies are needed to explain size-assortative nest choice behaviour in the sand goby.

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