Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.)
Abstract Atlantic cod (Gadus morhua L.) have been severely overexploited and are currently at historic population lows, having declined 90% in the North Sea and 99% off northeast Newfoundland in recent decades. Slow rates of recovery and continuing declines may be attributable to depensation, define...
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2004
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Online Access: | http://dx.doi.org/10.1016/j.icesjms.2004.07.007 http://academic.oup.com/icesjms/article-pdf/61/7/1144/29122804/61-7-1144.pdf |
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croxfordunivpr:10.1016/j.icesjms.2004.07.007 2024-05-12T08:00:52+00:00 Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) Rowe, Sherrylynn Hutchings, Jeffrey A. Bekkevold, Dorte Rakitin, Ana 2004 http://dx.doi.org/10.1016/j.icesjms.2004.07.007 http://academic.oup.com/icesjms/article-pdf/61/7/1144/29122804/61-7-1144.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 61, issue 7, page 1144-1150 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2004 croxfordunivpr https://doi.org/10.1016/j.icesjms.2004.07.007 2024-04-18T08:16:50Z Abstract Atlantic cod (Gadus morhua L.) have been severely overexploited and are currently at historic population lows, having declined 90% in the North Sea and 99% off northeast Newfoundland in recent decades. Slow rates of recovery and continuing declines may be attributable to depensation, defined as a reduction in per capita growth rate concomitant with reduced population size. Several potential causes of depensation relate to low mating success and consequent reduced production of offspring. We explore the empirical basis of one of these in Atlantic cod using egg fertilization and male abundance data obtained from 21 experimental populations generated by three independent research programmes. We find support for the hypotheses that (a) fertilization rate declines with abundance and (b) variance in fertilization rate increases as population size declines. The former identifies one potential mechanism underlying depensation in Atlantic cod. The latter has negative genetic consequences for effective population size (Ne), resulting in a decline in the ratio of Ne to census population size (Ne/Nc) with declining abundance. Our results may have general implications for the conservation biology of broadcast-spawning marine fish, particularly those with mating systems similar to that of Atlantic cod. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Oxford University Press ICES Journal of Marine Science 61 7 1144 1150 |
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 Rowe, Sherrylynn Hutchings, Jeffrey A. Bekkevold, Dorte Rakitin, Ana Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Atlantic cod (Gadus morhua L.) have been severely overexploited and are currently at historic population lows, having declined 90% in the North Sea and 99% off northeast Newfoundland in recent decades. Slow rates of recovery and continuing declines may be attributable to depensation, defined as a reduction in per capita growth rate concomitant with reduced population size. Several potential causes of depensation relate to low mating success and consequent reduced production of offspring. We explore the empirical basis of one of these in Atlantic cod using egg fertilization and male abundance data obtained from 21 experimental populations generated by three independent research programmes. We find support for the hypotheses that (a) fertilization rate declines with abundance and (b) variance in fertilization rate increases as population size declines. The former identifies one potential mechanism underlying depensation in Atlantic cod. The latter has negative genetic consequences for effective population size (Ne), resulting in a decline in the ratio of Ne to census population size (Ne/Nc) with declining abundance. Our results may have general implications for the conservation biology of broadcast-spawning marine fish, particularly those with mating systems similar to that of Atlantic cod. |
format |
Article in Journal/Newspaper |
author |
Rowe, Sherrylynn Hutchings, Jeffrey A. Bekkevold, Dorte Rakitin, Ana |
author_facet |
Rowe, Sherrylynn Hutchings, Jeffrey A. Bekkevold, Dorte Rakitin, Ana |
author_sort |
Rowe, Sherrylynn |
title |
Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
title_short |
Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
title_full |
Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
title_fullStr |
Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
title_full_unstemmed |
Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.) |
title_sort |
depensation, probability of fertilization, and the mating system of atlantic cod (gadus morhua l.) |
publisher |
Oxford University Press (OUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1016/j.icesjms.2004.07.007 http://academic.oup.com/icesjms/article-pdf/61/7/1144/29122804/61-7-1144.pdf |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
ICES Journal of Marine Science volume 61, issue 7, page 1144-1150 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2004.07.007 |
container_title |
ICES Journal of Marine Science |
container_volume |
61 |
container_issue |
7 |
container_start_page |
1144 |
op_container_end_page |
1150 |
_version_ |
1798842930743476224 |