Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging
Abstract Copepods of the genus Calanus are a critical source of food for the North Atlantic right whale (NARW), Eubalaena glacialis. We quantified variations in depth-integrated abundance and vertical distribution of Calanus spp. in the southern Gulf of St. Lawrence (sGSL) in August 2019. While Cala...
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Oxford University Press (OUP)
2023
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsad003 https://academic.oup.com/icesjms/article-pdf/80/4/787/50385032/fsad003.pdf |
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croxfordunivpr:10.1093/icesjms/fsad003 2024-03-17T08:57:16+00:00 Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging Sorochan, K A Plourde, S Johnson, C L Fields, David Fisheries and Oceans Canada 2023 http://dx.doi.org/10.1093/icesjms/fsad003 https://academic.oup.com/icesjms/article-pdf/80/4/787/50385032/fsad003.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 80, issue 4, page 787-802 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2023 croxfordunivpr https://doi.org/10.1093/icesjms/fsad003 2024-02-20T00:11:13Z Abstract Copepods of the genus Calanus are a critical source of food for the North Atlantic right whale (NARW), Eubalaena glacialis. We quantified variations in depth-integrated abundance and vertical distribution of Calanus spp. in the southern Gulf of St. Lawrence (sGSL) in August 2019. While Calanus finmarchicus was the most abundant species of Calanus, the larger C. hyperboreus was prominent in the Shediac Valley, a NARW high-use area, contributing a median of 55% estimated depth-integrated biomass of Calanus spp. during the first leg of the field mission. Near-bottom aggregations of Calanus spp. with concentrations exceeding 1000 ind m−3 occurred primarily at depths ranging from 70 to 90 m. Ontogenetic and diel vertical migrations likely contributed to development of these subsurface aggregations. During the day, Calanus spp. and euphausiids occurred in a compact near-bottom layer, indicating enhanced foraging conditions for NARW. We observed considerable variation in abundance and vertical distribution of Calanus spp., highlighting the dynamic nature of NARW prey distribution at scales of weeks and tens of kilometers in the sGSL. Article in Journal/Newspaper Calanus finmarchicus Eubalaena glacialis North Atlantic North Atlantic right whale Copepods Oxford University Press ICES Journal of Marine Science |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Sorochan, K A Plourde, S Johnson, C L Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Copepods of the genus Calanus are a critical source of food for the North Atlantic right whale (NARW), Eubalaena glacialis. We quantified variations in depth-integrated abundance and vertical distribution of Calanus spp. in the southern Gulf of St. Lawrence (sGSL) in August 2019. While Calanus finmarchicus was the most abundant species of Calanus, the larger C. hyperboreus was prominent in the Shediac Valley, a NARW high-use area, contributing a median of 55% estimated depth-integrated biomass of Calanus spp. during the first leg of the field mission. Near-bottom aggregations of Calanus spp. with concentrations exceeding 1000 ind m−3 occurred primarily at depths ranging from 70 to 90 m. Ontogenetic and diel vertical migrations likely contributed to development of these subsurface aggregations. During the day, Calanus spp. and euphausiids occurred in a compact near-bottom layer, indicating enhanced foraging conditions for NARW. We observed considerable variation in abundance and vertical distribution of Calanus spp., highlighting the dynamic nature of NARW prey distribution at scales of weeks and tens of kilometers in the sGSL. |
author2 |
Fields, David Fisheries and Oceans Canada |
format |
Article in Journal/Newspaper |
author |
Sorochan, K A Plourde, S Johnson, C L |
author_facet |
Sorochan, K A Plourde, S Johnson, C L |
author_sort |
Sorochan, K A |
title |
Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
title_short |
Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
title_full |
Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
title_fullStr |
Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
title_full_unstemmed |
Near-bottom aggregations of Calanus spp. copepods in the southern Gulf of St. Lawrence in summer: significance for North Atlantic right whale foraging |
title_sort |
near-bottom aggregations of calanus spp. copepods in the southern gulf of st. lawrence in summer: significance for north atlantic right whale foraging |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/icesjms/fsad003 https://academic.oup.com/icesjms/article-pdf/80/4/787/50385032/fsad003.pdf |
genre |
Calanus finmarchicus Eubalaena glacialis North Atlantic North Atlantic right whale Copepods |
genre_facet |
Calanus finmarchicus Eubalaena glacialis North Atlantic North Atlantic right whale Copepods |
op_source |
ICES Journal of Marine Science volume 80, issue 4, page 787-802 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsad003 |
container_title |
ICES Journal of Marine Science |
_version_ |
1793766355179143168 |