Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua)
<qd> Sherwood, G. D., and Grabowski, J. H. 2010. Exploring the life-history implications of colour variation in offshore Gulf of Maine cod ( Gadus morhua ). – ICES Journal of Marine Science, 67: 000–000. </qd>The evolution of alternative life-history strategies in fish has largely been o...
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fthighwire:oai:open-archive.highwire.org:icesjms:fsq094v1 2023-05-15T16:19:02+02:00 Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) Sherwood, Graham D. Grabowski, Jonathan H. 2010-07-29 00:13:05.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsq094v1 https://doi.org/10.1093/icesjms/fsq094 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsq094v1 http://dx.doi.org/10.1093/icesjms/fsq094 Copyright (C) 2010, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2010 fthighwire https://doi.org/10.1093/icesjms/fsq094 2013-05-26T22:46:52Z <qd> Sherwood, G. D., and Grabowski, J. H. 2010. Exploring the life-history implications of colour variation in offshore Gulf of Maine cod ( Gadus morhua ). – ICES Journal of Marine Science, 67: 000–000. </qd>The evolution of alternative life-history strategies in fish has largely been overlooked by fisheries managers, although differences in the biology of life-history variants can have important implications for the scale and productivity of fisheries. Cod display strikingly variable colouration in the Gulf of Maine, with red- and olive-coloured cod found in close sympatry. Colour types from Cashes Ledge, a shallow, offshore (∼100 km) feature, are examined to see whether they differ in key life-history traits including diet, depth distribution, growth, and body morphology. Red cod consumed significantly more crabs, lobsters, and demersal fish, whereas olive cod consumed more shrimp. Stable carbon isotope signatures (δ13C) varied significantly among colour types, but are thought to reflect baseline differences in δ13C at Cashes Ledge (potentially useful for residence estimates). Red cod were confined to a small area of shallow water (<20 m) and were significantly smaller at age than olive cod. Body shape was used to classify colour types correctly with 84% accuracy; red cod had shorter snouts, deeper bodies, and more slender tails than olive cod. Collectively, the results suggest that red cod are resident at Cashes Ledge and represent a life-history strategy distinct from olive cod. Text Gadus morhua HighWire Press (Stanford University) ICES Journal of Marine Science 67 8 1640 1649 |
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Article Sherwood, Graham D. Grabowski, Jonathan H. Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
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Article |
description |
<qd> Sherwood, G. D., and Grabowski, J. H. 2010. Exploring the life-history implications of colour variation in offshore Gulf of Maine cod ( Gadus morhua ). – ICES Journal of Marine Science, 67: 000–000. </qd>The evolution of alternative life-history strategies in fish has largely been overlooked by fisheries managers, although differences in the biology of life-history variants can have important implications for the scale and productivity of fisheries. Cod display strikingly variable colouration in the Gulf of Maine, with red- and olive-coloured cod found in close sympatry. Colour types from Cashes Ledge, a shallow, offshore (∼100 km) feature, are examined to see whether they differ in key life-history traits including diet, depth distribution, growth, and body morphology. Red cod consumed significantly more crabs, lobsters, and demersal fish, whereas olive cod consumed more shrimp. Stable carbon isotope signatures (δ13C) varied significantly among colour types, but are thought to reflect baseline differences in δ13C at Cashes Ledge (potentially useful for residence estimates). Red cod were confined to a small area of shallow water (<20 m) and were significantly smaller at age than olive cod. Body shape was used to classify colour types correctly with 84% accuracy; red cod had shorter snouts, deeper bodies, and more slender tails than olive cod. Collectively, the results suggest that red cod are resident at Cashes Ledge and represent a life-history strategy distinct from olive cod. |
format |
Text |
author |
Sherwood, Graham D. Grabowski, Jonathan H. |
author_facet |
Sherwood, Graham D. Grabowski, Jonathan H. |
author_sort |
Sherwood, Graham D. |
title |
Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
title_short |
Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
title_full |
Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
title_fullStr |
Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
title_full_unstemmed |
Exploring the life-history implications of colour variation in offshore Gulf of Maine cod (Gadus morhua) |
title_sort |
exploring the life-history implications of colour variation in offshore gulf of maine cod (gadus morhua) |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsq094v1 https://doi.org/10.1093/icesjms/fsq094 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsq094v1 http://dx.doi.org/10.1093/icesjms/fsq094 |
op_rights |
Copyright (C) 2010, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsq094 |
container_title |
ICES Journal of Marine Science |
container_volume |
67 |
container_issue |
8 |
container_start_page |
1640 |
op_container_end_page |
1649 |
_version_ |
1766005348846534656 |