Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic)
The trophic structure of the benthic ecosystem of the Grande Vasière (Great Mud Bank), a heavily trawled area in the Bay of Biscay, is largely unknown. To better understand the biotic interactions between exploited species (mainly Norway lobster, Nephrops norvegicus, and European hake, Merluccius me...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2005
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Online Access: | http://dx.doi.org/10.1139/f04-242 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-242 |
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crcansciencepubl:10.1139/f04-242 2024-09-15T18:25:24+00:00 Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) Loc'h, François Le Hily, Christian 2005 http://dx.doi.org/10.1139/f04-242 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-242 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 1, page 123-132 ISSN 0706-652X 1205-7533 journal-article 2005 crcansciencepubl https://doi.org/10.1139/f04-242 2024-07-11T04:12:02Z The trophic structure of the benthic ecosystem of the Grande Vasière (Great Mud Bank), a heavily trawled area in the Bay of Biscay, is largely unknown. To better understand the biotic interactions between exploited species (mainly Norway lobster, Nephrops norvegicus, and European hake, Merluccius merluccius) and their competitors and prey, we applied a dual stable carbon ( 13 C/ 12 C) and nitrogen ( 15 N/ 14 N) isotope analysis to determine trophic levels and differences in the potential food sources of species in the benthic and demersal communities. Five main groups of species constitute the basis of the trophic structure. They are distributed in three main trophic levels: primary consumers; secondary consumers including N. norvegicus and juvenile M. merluccius; and top predators including adult M. merluccius (δ 15 N = 14.5). The large differences in δ 13 C values within the primary consumers attest to two different food components: a pelagic component composed of fresh sedimenting particulate organic matter, which mainly supplies supra- and epi-benthic suspension feeders, and zooplankton, and a benthic component, which mainly supplies deposit feeders. For the predators, the target species, and their competitors, diet changes during the life-span are reflected by differences in isotope values for the size classes. Article in Journal/Newspaper Northeast Atlantic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 62 1 123 132 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The trophic structure of the benthic ecosystem of the Grande Vasière (Great Mud Bank), a heavily trawled area in the Bay of Biscay, is largely unknown. To better understand the biotic interactions between exploited species (mainly Norway lobster, Nephrops norvegicus, and European hake, Merluccius merluccius) and their competitors and prey, we applied a dual stable carbon ( 13 C/ 12 C) and nitrogen ( 15 N/ 14 N) isotope analysis to determine trophic levels and differences in the potential food sources of species in the benthic and demersal communities. Five main groups of species constitute the basis of the trophic structure. They are distributed in three main trophic levels: primary consumers; secondary consumers including N. norvegicus and juvenile M. merluccius; and top predators including adult M. merluccius (δ 15 N = 14.5). The large differences in δ 13 C values within the primary consumers attest to two different food components: a pelagic component composed of fresh sedimenting particulate organic matter, which mainly supplies supra- and epi-benthic suspension feeders, and zooplankton, and a benthic component, which mainly supplies deposit feeders. For the predators, the target species, and their competitors, diet changes during the life-span are reflected by differences in isotope values for the size classes. |
format |
Article in Journal/Newspaper |
author |
Loc'h, François Le Hily, Christian |
spellingShingle |
Loc'h, François Le Hily, Christian Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
author_facet |
Loc'h, François Le Hily, Christian |
author_sort |
Loc'h, François Le |
title |
Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
title_short |
Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
title_full |
Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
title_fullStr |
Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
title_full_unstemmed |
Stable carbon and nitrogen isotope analysis of Nephrops norvegicus / Merluccius merluccius fishing grounds in the Bay of Biscay (Northeast Atlantic) |
title_sort |
stable carbon and nitrogen isotope analysis of nephrops norvegicus / merluccius merluccius fishing grounds in the bay of biscay (northeast atlantic) |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/f04-242 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-242 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 1, page 123-132 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f04-242 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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62 |
container_issue |
1 |
container_start_page |
123 |
op_container_end_page |
132 |
_version_ |
1810465918928551936 |