Behavioural and morphological responses to cannibalism in Arctic charr (Salvelinus alpinus)
2005 (English)In: Evolutionary Ecology Research, ISSN 1522-0613, Vol. 7, no 5, 767-778 p.Article in journal (Refereed) Published
Question: Does cannibalism lead to resource polymorphism in young Arctic charr (Salvelinusalpinus, Pisces)?
Hypothesis: Cannibals should evoke a low-activity morph that is well adapted to benthivorybut not planktivory, and which differs in morphology compared with a planktivorous morph.
Methods: We reared young-of-the-year charr in laboratory aquaria with and without largercannibalistic charr present. Thereafter, we measured foraging efficiency on pelagic and benthicresources, swimming speed when foraging, and morphology of the young charr.
Conclusions: Living among cannibals did not affect the morphology of the young charr. Italso did not affect the foraging efficiency of the young charr on the benthic resource. However,individuals from cannibal treatments swam closer and had lower foraging efficiency on thepelagic resource.
Place, publisher, year, edition, pages
Tucson: Evolutionary Ecology , 2005. Vol. 7, no 5, 767-778 p.
geometric morphometrics, phenotypic plasticity, predation risk, resource polymorphism
IdentifiersURN: urn:nbn:se:umu:diva-4841OAI: oai:DiVA.org:umu-4841DiVA: diva2:144093