Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res
Abstract Cod populations in Newfoundland and Labrador waters have shown differing growth, condition and recruitment since near-universal declines in these properties during the cold period of the late 1980s and early 1990s. To assess the influence of variable prey communities on these parameters, we...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1080.8143 2023-05-15T16:19:19+02:00 Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res Graham D Sherwood Rick M Rideout Susan B Fudge George A Rose The Pennsylvania State University CiteSeerX Archives 2007 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.8143 http://www.d.umn.edu/biology/documents/Sherwood2.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.8143 http://www.d.umn.edu/biology/documents/Sherwood2.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.d.umn.edu/biology/documents/Sherwood2.pdf text 2007 ftciteseerx 2020-05-03T00:24:14Z Abstract Cod populations in Newfoundland and Labrador waters have shown differing growth, condition and recruitment since near-universal declines in these properties during the cold period of the late 1980s and early 1990s. To assess the influence of variable prey communities on these parameters, we compared cod energetics and diet in populations off Labrador and the northeast and south coasts of Newfoundland. Many properties were highest in the southern group(s) and lowest in the northern group(s), including growth, somatic condition, liver index and age-at-maturity. Most differences could be explained by variations in diet, as measured by stomach contents and stable carbon isotopes (d 13 C). The diet of Labrador cod consisted almost entirely of northern shrimp (Pandalus borealis), and these cod displayed the most benthic d 13 C signatures. Northeast cod had a more varied diet that included capelin and other fish, but still had mostly benthic d 13 C signatures, suggesting the importance of benthic prey like shrimp in this population. South coast cod exhibited the most varied diet, including capelin (Mallotus villosus), zooplankton, crabs and other fish, and had the most pelagic d 13 C signatures. Among and within populations, the benefits of a more pelagic diet in medium-sized (30-69 cm) cod included higher somatic condition, higher liver index (lipid stores) and greater spawning potential (decreased incidence of atresia). It is hypothesized that major rebuilding of Newfoundland and Labrador cod stocks will require a return to a system that supports mostly pelagic feeding (i.e. capelin) in cod. r Text Gadus morhua Newfoundland northern shrimp Pandalus borealis Unknown Newfoundland |
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Abstract Cod populations in Newfoundland and Labrador waters have shown differing growth, condition and recruitment since near-universal declines in these properties during the cold period of the late 1980s and early 1990s. To assess the influence of variable prey communities on these parameters, we compared cod energetics and diet in populations off Labrador and the northeast and south coasts of Newfoundland. Many properties were highest in the southern group(s) and lowest in the northern group(s), including growth, somatic condition, liver index and age-at-maturity. Most differences could be explained by variations in diet, as measured by stomach contents and stable carbon isotopes (d 13 C). The diet of Labrador cod consisted almost entirely of northern shrimp (Pandalus borealis), and these cod displayed the most benthic d 13 C signatures. Northeast cod had a more varied diet that included capelin and other fish, but still had mostly benthic d 13 C signatures, suggesting the importance of benthic prey like shrimp in this population. South coast cod exhibited the most varied diet, including capelin (Mallotus villosus), zooplankton, crabs and other fish, and had the most pelagic d 13 C signatures. Among and within populations, the benefits of a more pelagic diet in medium-sized (30-69 cm) cod included higher somatic condition, higher liver index (lipid stores) and greater spawning potential (decreased incidence of atresia). It is hypothesized that major rebuilding of Newfoundland and Labrador cod stocks will require a return to a system that supports mostly pelagic feeding (i.e. capelin) in cod. r |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Graham D Sherwood Rick M Rideout Susan B Fudge George A Rose |
spellingShingle |
Graham D Sherwood Rick M Rideout Susan B Fudge George A Rose Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
author_facet |
Graham D Sherwood Rick M Rideout Susan B Fudge George A Rose |
author_sort |
Graham D Sherwood |
title |
Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
title_short |
Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
title_full |
Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
title_fullStr |
Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
title_full_unstemmed |
Influence of diet on growth, condition and reproductive capacity in Newfoundland and Labrador cod (Gadus morhua): Insights from stable carbon isotopes (δ13C). Deep Sea Res |
title_sort |
influence of diet on growth, condition and reproductive capacity in newfoundland and labrador cod (gadus morhua): insights from stable carbon isotopes (δ13c). deep sea res |
publishDate |
2007 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.8143 http://www.d.umn.edu/biology/documents/Sherwood2.pdf |
geographic |
Newfoundland |
geographic_facet |
Newfoundland |
genre |
Gadus morhua Newfoundland northern shrimp Pandalus borealis |
genre_facet |
Gadus morhua Newfoundland northern shrimp Pandalus borealis |
op_source |
http://www.d.umn.edu/biology/documents/Sherwood2.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.8143 http://www.d.umn.edu/biology/documents/Sherwood2.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766005696144343040 |