Ontogeny and dietary specialization in brown trout (Salmo trutta L.) from Loch Ness, Scotland, examined using stable isotopes of carbon and nitrogen

Grey, Jonathan (2001) Ontogeny and dietary specialization in brown trout (Salmo trutta L.) from Loch Ness, Scotland, examined using stable isotopes of carbon and nitrogen. Ecology of Freshwater Fish, 10 (3). pp. 168-176. ISSN 0906-6691

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Abstract

The trophic ecology of many fish species in cold temperate lakes is often characterized by a generalist or opportunist strategy. In this study, the diets of polytrophic brown trout in Loch Ness, Scotland, have been examined using stable isotopes of carbon and nitrogen to complement gut content analyses and aging by otolith annuli counts. Using the stable isotope ratios, it was possible to trace trout ontogeny from parr development in a natal river to piscivory in the pelagic. Potential dilution of maternal isotope signatures from eggs to parr was also demonstrated. Despite the low productivity of the loch, intraspecific variability in isotope ratios suggested dietary specialization, rather than opportunism, in some individuals.

Item Type: Journal Article
Journal or Publication Title: Ecology of Freshwater Fish
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1100/1104
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 74839
Deposited By: ep_importer_pure
Deposited On: 31 Jul 2015 11:08
Refereed?: Yes
Published?: Published
Last Modified: 23 Jan 2020 02:42
URI: https://eprints.lancs.ac.uk/id/eprint/74839

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