What's love got to do with it? Ontogenetic changes in drivers of dispersal in a marine ectoparasite
AbstractSex-biased dispersal is common in nature and can influence the way in which organisms are distributed throughout the environment with consequences at the individual, population, community, and species level. Much of our understanding of what drives sex-biased dispersal stems from work on birds and mammals where dispersal tends to be female and male biased, respectively. Here, we draw on this large body of empirical and theoretical work on vertebrates to investigate what drives breeding dispersal in an ectoparasite, the salmon louse, Lepeophtheirus salmonis. We manipulated the density, sex, and developmental stage of lice on pairs of juvenile pink salmon (Oncorhynchus gorbuscha) hosts and show that the probability of leaving a host is density dependent at the preadult I stage and dependent on the presence of the opposite sex at preadult II and adult stages. Experiments in which louse movement was observed in groups of 25 individually infected hosts supported findings from individual experiments. Lice appeared to account for predation risk as they were 3 times more likely to disperse in the dark, when susceptibility to predation was low, than in the light. Our results support the hypothesis that asymmetry in reproductive investment shapes patterns of sex-biased dispersal and highlight the potential for drivers of dispersal to change with ontogeny. These findings are the first to establish what drives dispersal in the ecologically and economically important salmon louse and highlight the generality of the role mate competition plays in driving sex-biased dispersal across the animal kingdom. Copyright 2011, Oxford University Press.
Download InfoIf you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.
Bibliographic InfoArticle provided by International Society for Behavioral Ecology in its journal Behavioral Ecology.
Volume (Year): 22 (2011)
Issue (Month): 3 ()
Contact details of provider:
Postal: Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, UK
Fax: 01865 267 985
Web page: http://beheco.oxfordjournals.org/
You can help add them by filling out this form.
reading list or among the top items on IDEAS.Access and download statisticsgeneral information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Oxford University Press) or (Christopher F. Baum).
If references are entirely missing, you can add them using this form.