The expression of dietary conservatism in solitary and shoaling 3-spined sticklebacks Gasterosteus aculeatus
AbstractDietary conservatism (DC) is a long-term, active avoidance of novel food by foragers, present in some (but not all) members of each forager population. Conservative prey choice by predators may exert strong selection pressure on prey populations because individuals with a novel appearance may be protected from predation by their novelty. Recent work has provided the first evidence of DC in a fish species, where novel-colored morphs of prey (Daphnia) were under predation by individual 3-spined sticklebacks Gasterosteus aculeatus. However, in this earlier study, sticklebacks were housed individually, whereas in the wild, they are a strongly shoaling species. Little is known about whether the social context may influence the expression of DC, but even if it does not, shoals are very likely to contain at least one nonconservative individual. Thus, most foraging shoals are expected to exert stronger selection against novel prey than are individual foragers. We found that DC, strong enough to drive a novel prey morph from initial rarity to fixation in a prey population, was evident among both single sticklebacks and shoals, but surprisingly, we found no evidence that isolated fish and shoals differed in the frequency with which they caused this to happen. 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): 4 ()
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 you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.