Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances
In the North Atlantic, Calanus finmarchicus , C. glacialis and C. hyperboreus are identified based on subtle morphological traits, which is fastidious, or based on their allegedly non-overlapping prosome length ranges. We reappraised the prosome length-based diagnosis for the copepodite stage V stag...
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fthighwire:oai:open-archive.highwire.org:plankt:fbr072v2 2023-05-15T14:57:53+02:00 Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances Parent, Genevieve J. Plourde, Stephane Turgeon, Julie 2011-08-18 07:29:20.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/fbr072v2 https://doi.org/10.1093/plankt/fbr072 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/fbr072v2 http://dx.doi.org/10.1093/plankt/fbr072 Copyright (C) 2011, Oxford University Press Article TEXT 2011 fthighwire https://doi.org/10.1093/plankt/fbr072 2016-11-16T18:35:56Z In the North Atlantic, Calanus finmarchicus , C. glacialis and C. hyperboreus are identified based on subtle morphological traits, which is fastidious, or based on their allegedly non-overlapping prosome length ranges. We reappraised the prosome length-based diagnosis for the copepodite stage V stage by coupling prosome length and molecular identifications (mtDNA, 16S gene) for 1159 individuals collected over 2 years from 15 stations off the Canadian coast from the Arctic to the Atlantic. We observed spatial but no intra-annual variation in species' average prosome length. At sympatric coastal sites, prosome length overlap was frequent between C. finmarchicus and C. glacialis and restricted to the Estuary/Gulf of St. Lawrence between C. glacialis and C. hyperboreus . We used discriminant analyses to redefine prosome length criteria to minimize errors in species identification. Species abundances were corrected and this affected mostly C. glacialis . In the St. Lawrence Estuary and on the Labrador shelf, abundance of C. glacialis was underestimated by 19 and 35%, respectively, with important interannual variations since 2000. This increase in abundance could enhance estimation of the role of C. glacialis in the food web and potentially alter our view of the long-term changes along the eastern Canadian coast. Text Arctic Calanus finmarchicus North Atlantic HighWire Press (Stanford University) Arctic Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) Journal of Plankton Research 33 11 1654 1665 |
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English |
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Article Parent, Genevieve J. Plourde, Stephane Turgeon, Julie Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
topic_facet |
Article |
description |
In the North Atlantic, Calanus finmarchicus , C. glacialis and C. hyperboreus are identified based on subtle morphological traits, which is fastidious, or based on their allegedly non-overlapping prosome length ranges. We reappraised the prosome length-based diagnosis for the copepodite stage V stage by coupling prosome length and molecular identifications (mtDNA, 16S gene) for 1159 individuals collected over 2 years from 15 stations off the Canadian coast from the Arctic to the Atlantic. We observed spatial but no intra-annual variation in species' average prosome length. At sympatric coastal sites, prosome length overlap was frequent between C. finmarchicus and C. glacialis and restricted to the Estuary/Gulf of St. Lawrence between C. glacialis and C. hyperboreus . We used discriminant analyses to redefine prosome length criteria to minimize errors in species identification. Species abundances were corrected and this affected mostly C. glacialis . In the St. Lawrence Estuary and on the Labrador shelf, abundance of C. glacialis was underestimated by 19 and 35%, respectively, with important interannual variations since 2000. This increase in abundance could enhance estimation of the role of C. glacialis in the food web and potentially alter our view of the long-term changes along the eastern Canadian coast. |
format |
Text |
author |
Parent, Genevieve J. Plourde, Stephane Turgeon, Julie |
author_facet |
Parent, Genevieve J. Plourde, Stephane Turgeon, Julie |
author_sort |
Parent, Genevieve J. |
title |
Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
title_short |
Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
title_full |
Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
title_fullStr |
Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
title_full_unstemmed |
Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances |
title_sort |
overlapping size ranges of calanus spp. off the canadian arctic and atlantic coasts: impact on species' abundances |
publisher |
Oxford University Press |
publishDate |
2011 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/fbr072v2 https://doi.org/10.1093/plankt/fbr072 |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) |
geographic |
Arctic Labrador Shelf |
geographic_facet |
Arctic Labrador Shelf |
genre |
Arctic Calanus finmarchicus North Atlantic |
genre_facet |
Arctic Calanus finmarchicus North Atlantic |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/fbr072v2 http://dx.doi.org/10.1093/plankt/fbr072 |
op_rights |
Copyright (C) 2011, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbr072 |
container_title |
Journal of Plankton Research |
container_volume |
33 |
container_issue |
11 |
container_start_page |
1654 |
op_container_end_page |
1665 |
_version_ |
1766329986120155136 |