Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries

The food webs of littoral, pelagic, and littoral-pelagic ecotone (interface) regions of a large subtropical lake were investigated using stable isotope ratio methods, expanding the focus of a previous fish-only study to include other food web components such as primary producers and invertebrates. I...

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Autores principales: Havens, Karl E., Gu, Binhe, Fry, Brian, Kendall, Carol
Formato: Online Artículo Texto
Lenguaje:English
Publicado: TheScientificWorldJOURNAL 2003
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5974766/
https://www.ncbi.nlm.nih.gov/pubmed/12920311
http://dx.doi.org/10.1100/tsw.2003.55
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author Havens, Karl E.
Gu, Binhe
Fry, Brian
Kendall, Carol
author_facet Havens, Karl E.
Gu, Binhe
Fry, Brian
Kendall, Carol
author_sort Havens, Karl E.
collection PubMed
description The food webs of littoral, pelagic, and littoral-pelagic ecotone (interface) regions of a large subtropical lake were investigated using stable isotope ratio methods, expanding the focus of a previous fish-only study to include other food web components such as primary producers and invertebrates. In these food webs, δC increased ~4o/oo and δN increased ~10o/oo from primary producers to fish. The δN of fish was ~9o/oo in the littoral zone, ~10 o/oo in the ecotone, and ~12o/oo in the pelagic zone. The cross-habitat enrichment in fish N corresponded with both an increase in the size of fish and an increase in the δN of primary consumers (mollusks). Despite larger body size in the pelagic zone, fish in all three habitats appear to occur at the same average trophic level (TL = 4), assuming an enrichment factor of 3.4o/oo per trophic level, and normalizing to the δN of primary consumers.
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spelling pubmed-59747662018-06-10 Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries Havens, Karl E. Gu, Binhe Fry, Brian Kendall, Carol ScientificWorldJournal Research Article The food webs of littoral, pelagic, and littoral-pelagic ecotone (interface) regions of a large subtropical lake were investigated using stable isotope ratio methods, expanding the focus of a previous fish-only study to include other food web components such as primary producers and invertebrates. In these food webs, δC increased ~4o/oo and δN increased ~10o/oo from primary producers to fish. The δN of fish was ~9o/oo in the littoral zone, ~10 o/oo in the ecotone, and ~12o/oo in the pelagic zone. The cross-habitat enrichment in fish N corresponded with both an increase in the size of fish and an increase in the δN of primary consumers (mollusks). Despite larger body size in the pelagic zone, fish in all three habitats appear to occur at the same average trophic level (TL = 4), assuming an enrichment factor of 3.4o/oo per trophic level, and normalizing to the δN of primary consumers. TheScientificWorldJOURNAL 2003-07-30 /pmc/articles/PMC5974766/ /pubmed/12920311 http://dx.doi.org/10.1100/tsw.2003.55 Text en Copyright © 2003 Karl E. Havens et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Havens, Karl E.
Gu, Binhe
Fry, Brian
Kendall, Carol
Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title_full Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title_fullStr Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title_full_unstemmed Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title_short Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for N Enrichment of Pelagic vs. Littoral Fisheries
title_sort stable isotope food web analysis of a large subtropical lake: alternative explanations for n enrichment of pelagic vs. littoral fisheries
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5974766/
https://www.ncbi.nlm.nih.gov/pubmed/12920311
http://dx.doi.org/10.1100/tsw.2003.55
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