Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing
Large, dominant fish species that are the basis of many fisheries may be naturally so successful due partly to "cultivation effects," where adults crop down forage species that are potential competitors/predators of their own juveniles. Such effects imply a converse impact when adult abund...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f00-160 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-160 |
id |
crcansciencepubl:10.1139/f00-160 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f00-160 2024-09-15T17:55:29+00:00 Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing Walters, Carl Kitchell, James F 2001 http://dx.doi.org/10.1139/f00-160 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-160 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 1, page 39-50 ISSN 0706-652X 1205-7533 journal-article 2001 crcansciencepubl https://doi.org/10.1139/f00-160 2024-08-08T04:13:40Z Large, dominant fish species that are the basis of many fisheries may be naturally so successful due partly to "cultivation effects," where adults crop down forage species that are potential competitors/predators of their own juveniles. Such effects imply a converse impact when adult abundance is severely reduced by fishing: increases in forage species may then cause lagged, apparently depensatory decreases in juvenile survival. Depensatory effects can then delay or prevent stock rebuilding. Cultivation effects are apparently common in freshwater communities and may also explain low recruitment success following severe declines of some major marine stocks such as Newfoundland Atlantic cod (Gadus morhua). Risk of depensatory effects should be a major target of recruitment research, and management policies should aim for considerably higher spawning abundances than has previously been assumed necessary based on recruitment data collected during adult stock declines associated with fishery development. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 58 1 39 50 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Large, dominant fish species that are the basis of many fisheries may be naturally so successful due partly to "cultivation effects," where adults crop down forage species that are potential competitors/predators of their own juveniles. Such effects imply a converse impact when adult abundance is severely reduced by fishing: increases in forage species may then cause lagged, apparently depensatory decreases in juvenile survival. Depensatory effects can then delay or prevent stock rebuilding. Cultivation effects are apparently common in freshwater communities and may also explain low recruitment success following severe declines of some major marine stocks such as Newfoundland Atlantic cod (Gadus morhua). Risk of depensatory effects should be a major target of recruitment research, and management policies should aim for considerably higher spawning abundances than has previously been assumed necessary based on recruitment data collected during adult stock declines associated with fishery development. |
format |
Article in Journal/Newspaper |
author |
Walters, Carl Kitchell, James F |
spellingShingle |
Walters, Carl Kitchell, James F Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
author_facet |
Walters, Carl Kitchell, James F |
author_sort |
Walters, Carl |
title |
Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
title_short |
Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
title_full |
Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
title_fullStr |
Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
title_full_unstemmed |
Cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
title_sort |
cultivation/depensation effects on juvenile survival and recruitment: implications for the theory of fishing |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f00-160 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-160 |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 1, page 39-50 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f00-160 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
50 |
_version_ |
1810431770624000000 |