Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish
Abstract Successful resource‐management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, this remains a fundamental challenge. Based on daily parentage assignme...
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crwiley:10.1002/ece3.4615 2024-09-09T19:29:44+00:00 Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish Roney, Nancy E. Oomen, Rebekah A. Knutsen, Halvor Olsen, Esben M. Hutchings, Jeffrey A. Natural Sciences and Engineering Research Council of Canada Norges Forskningsråd Norges Forskningsråd European Regional Development Fund 2018 http://dx.doi.org/10.1002/ece3.4615 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.4615 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.4615 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 8, issue 23, page 11634-11644 ISSN 2045-7758 2045-7758 journal-article 2018 crwiley https://doi.org/10.1002/ece3.4615 2024-08-15T04:20:58Z Abstract Successful resource‐management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, this remains a fundamental challenge. Based on daily parentage assignments of more than 4,000 offspring, we document fine‐scaled temporal differences in individual reproductive success for two spatially adjacent (<10 km) populations of a broadcast‐spawning marine fish. Distinguished by differences in genetics and life history, Atlantic cod ( Gadus morhua ) from inner‐ and outer‐fjord populations were allowed to compete for mating and reproductive opportunities. After accounting for phenotypic variability in several traits, reproductive success of outer‐fjord cod was significantly lower than that of inner‐fjord cod. This finding, given that genomically different cod ecotypes inhabit inner‐ and outer‐fjord waters, raises the intriguing hypothesis that the populations might be diverging because of ecological speciation. Individual reproductive success, skewed within both sexes (more so among males), was positively affected by body size, which also influenced the timing of reproduction, larger individuals spawning later among females but earlier among males. Our work suggests that spatial mismatches between management and biological units exist in marine fishes and that studies of reproductive interactions between putative populations or ecotypes can provide an informative basis on which determination of the scale of local adaptation can be ascertained. Article in Journal/Newspaper atlantic cod Gadus morhua Wiley Online Library Ecology and Evolution 8 23 11634 11644 |
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English |
description |
Abstract Successful resource‐management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, this remains a fundamental challenge. Based on daily parentage assignments of more than 4,000 offspring, we document fine‐scaled temporal differences in individual reproductive success for two spatially adjacent (<10 km) populations of a broadcast‐spawning marine fish. Distinguished by differences in genetics and life history, Atlantic cod ( Gadus morhua ) from inner‐ and outer‐fjord populations were allowed to compete for mating and reproductive opportunities. After accounting for phenotypic variability in several traits, reproductive success of outer‐fjord cod was significantly lower than that of inner‐fjord cod. This finding, given that genomically different cod ecotypes inhabit inner‐ and outer‐fjord waters, raises the intriguing hypothesis that the populations might be diverging because of ecological speciation. Individual reproductive success, skewed within both sexes (more so among males), was positively affected by body size, which also influenced the timing of reproduction, larger individuals spawning later among females but earlier among males. Our work suggests that spatial mismatches between management and biological units exist in marine fishes and that studies of reproductive interactions between putative populations or ecotypes can provide an informative basis on which determination of the scale of local adaptation can be ascertained. |
author2 |
Natural Sciences and Engineering Research Council of Canada Norges Forskningsråd Norges Forskningsråd European Regional Development Fund |
format |
Article in Journal/Newspaper |
author |
Roney, Nancy E. Oomen, Rebekah A. Knutsen, Halvor Olsen, Esben M. Hutchings, Jeffrey A. |
spellingShingle |
Roney, Nancy E. Oomen, Rebekah A. Knutsen, Halvor Olsen, Esben M. Hutchings, Jeffrey A. Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
author_facet |
Roney, Nancy E. Oomen, Rebekah A. Knutsen, Halvor Olsen, Esben M. Hutchings, Jeffrey A. |
author_sort |
Roney, Nancy E. |
title |
Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
title_short |
Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
title_full |
Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
title_fullStr |
Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
title_full_unstemmed |
Fine‐scale population differences in Atlantic cod reproductive success: A potential mechanism for ecological speciation in a marine fish |
title_sort |
fine‐scale population differences in atlantic cod reproductive success: a potential mechanism for ecological speciation in a marine fish |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/ece3.4615 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.4615 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.4615 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Ecology and Evolution volume 8, issue 23, page 11634-11644 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.4615 |
container_title |
Ecology and Evolution |
container_volume |
8 |
container_issue |
23 |
container_start_page |
11634 |
op_container_end_page |
11644 |
_version_ |
1809898847424479232 |