Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances
Abstract Abundances of Atlantic cod Gadus morhua and white hake Urophycis tenuis have dropped to historically low levels in the southern Gulf of St. Lawrence. Stomach samples were collected during late summer 2001 and 2002 to compare ontogenetic diet patterns at a time when food presumably was not l...
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crwiley:10.1080/00028487.2011.607049 2023-12-03T10:18:11+01:00 Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances Hanson, John Mark 2011 http://dx.doi.org/10.1080/00028487.2011.607049 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/00028487.2011.607049 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Transactions of the American Fisheries Society volume 140, issue 4, page 1070-1077 ISSN 0002-8487 1548-8659 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2011 crwiley https://doi.org/10.1080/00028487.2011.607049 2023-11-09T14:30:46Z Abstract Abundances of Atlantic cod Gadus morhua and white hake Urophycis tenuis have dropped to historically low levels in the southern Gulf of St. Lawrence. Stomach samples were collected during late summer 2001 and 2002 to compare ontogenetic diet patterns at a time when food presumably was not limiting. White hake had a narrow diet and showed an abrupt ontogenetic diet change: fish less than 35 cm total length (TL) consumed benthic invertebrates (sevenspine bay shrimp Crangon septemspinosa , gammarid amphipods, or polychaetes), while those at least 35 cm TL preyed mainly on Atlantic herring Clupea harengus . Atlantic cod had a broad diet initially dominated by benthic and pelagic invertebrates (Arctic argid Argis dentata , Aesop shrimp Pandalus montagui, Eualus spp., mysids, northern propeller clams Cyrtodaria siliqua , and polychaetes). Fish (mainly Atlantic herring, capelin Mallotus villosus , and small demersal species) were gradually incorporated into the Atlantic cod diet but did not comprise more than 50% of prey biomass until the cod reached a length of 50–60 cm TL. The incidence of cannibalism was low for both fishes. Diet overlap was low between all sizes of Atlantic cod and white hake but was high between adjacent size‐classes of Atlantic cod and for all size‐classes of white hake greater than 35 cm TL (where Atlantic herring comprised more than 70% of prey biomass). Article in Journal/Newspaper Arctic atlantic cod Gadus morhua Wiley Online Library (via Crossref) Arctic Hake ENVELOPE(15.612,15.612,66.797,66.797) Transactions of the American Fisheries Society 140 4 1070 1077 |
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Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hanson, John Mark Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Abundances of Atlantic cod Gadus morhua and white hake Urophycis tenuis have dropped to historically low levels in the southern Gulf of St. Lawrence. Stomach samples were collected during late summer 2001 and 2002 to compare ontogenetic diet patterns at a time when food presumably was not limiting. White hake had a narrow diet and showed an abrupt ontogenetic diet change: fish less than 35 cm total length (TL) consumed benthic invertebrates (sevenspine bay shrimp Crangon septemspinosa , gammarid amphipods, or polychaetes), while those at least 35 cm TL preyed mainly on Atlantic herring Clupea harengus . Atlantic cod had a broad diet initially dominated by benthic and pelagic invertebrates (Arctic argid Argis dentata , Aesop shrimp Pandalus montagui, Eualus spp., mysids, northern propeller clams Cyrtodaria siliqua , and polychaetes). Fish (mainly Atlantic herring, capelin Mallotus villosus , and small demersal species) were gradually incorporated into the Atlantic cod diet but did not comprise more than 50% of prey biomass until the cod reached a length of 50–60 cm TL. The incidence of cannibalism was low for both fishes. Diet overlap was low between all sizes of Atlantic cod and white hake but was high between adjacent size‐classes of Atlantic cod and for all size‐classes of white hake greater than 35 cm TL (where Atlantic herring comprised more than 70% of prey biomass). |
format |
Article in Journal/Newspaper |
author |
Hanson, John Mark |
author_facet |
Hanson, John Mark |
author_sort |
Hanson, John Mark |
title |
Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
title_short |
Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
title_full |
Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
title_fullStr |
Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
title_full_unstemmed |
Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances |
title_sort |
ontogenetic diet comparison of atlantic cod and white hake occurring at historically low population abundances |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1080/00028487.2011.607049 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/00028487.2011.607049 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Arctic Hake |
geographic_facet |
Arctic Hake |
genre |
Arctic atlantic cod Gadus morhua |
genre_facet |
Arctic atlantic cod Gadus morhua |
op_source |
Transactions of the American Fisheries Society volume 140, issue 4, page 1070-1077 ISSN 0002-8487 1548-8659 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1080/00028487.2011.607049 |
container_title |
Transactions of the American Fisheries Society |
container_volume |
140 |
container_issue |
4 |
container_start_page |
1070 |
op_container_end_page |
1077 |
_version_ |
1784265171459375104 |