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  The utility of carbon and nitrogen isotope analyses to trace contributions from fish farms to the receiving communities of freshwater lakes: a pilot study in Esthwaite Water, UK

Grey, J., Waldron, S., & Hutchinson, R. (2004). The utility of carbon and nitrogen isotope analyses to trace contributions from fish farms to the receiving communities of freshwater lakes: a pilot study in Esthwaite Water, UK. Hydrobiologia, 524(1), 253-262.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DAA2-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DAA3-F
Genre: Journal Article

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 Creators:
Grey, Jonathan1, Author              
Waldron, Susan, Author
Hutchinson, Rebecca, Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: benthos; carbon; fish farms; nitrogen; plankton; stable isotopes
 Abstract: A pilot study was conducted to assess the potential for stable isotope analyses to reveal the fate of waste pelleted food material from fish farms in freshwater food webs. Esthwaite Water (Cumbria, UK) was selected as the study site, as it hosts an established salmonid farm, and a wealth of complementary limnological data exists. Salmonid pellet feed consists of primarily marine-derived material and thus exhibits carbon and nitrogen stable isotopic compositions distinct to most freshwater organic material. Comparison of the isotopic ratios of organisms at the cage site with an unaffected control site, supports incorporation of pellet-derived material to the diet of planktonic and benthic communities. Moreover, after allowing for a number of trophic transfers, stable isotope analyses revealed the predatory cladoceran Leptodora kindti also utilised pellet material, while roach were probably short-circuiting the food chain by directly consuming particulate pellet material, as well as via ingestion of their zooplankton prey. Isotope data substituted into a simple two-source mixing model suggested that approximately 65% of Daphnia, and >80% of roach body carbon may be derived from pellet material in the plankton, and that chironomid larvae may incorporate >50% in the sediment environs. However, contributions calculated from both delta(13)C and delta(15)N values were inconsistent, which may simply be due to the constraints of the model and parameters used, but may also reflect different routing of isotopes from the original pellet source, via soluble or particulate routes

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Language(s): eng - English
 Dates: 2004-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 200407
Other: 2312/S 38187
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Title: Hydrobiologia
Source Genre: Journal
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Pages: - Volume / Issue: 524 (1) Sequence Number: - Start / End Page: 253 - 262 Identifier: ISSN: 0018-8158