Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks
Predation by clupeoid species (e.g., Atlantic herring, Clupea harengus Linnaeus, 1758) on the early life stages of gadoids is hypothesized to be an important source of mortality, especially for Atlantic cod, Gadus morhua Linnaeus, 1758. Adult cod also prey on herring, creating a positive feedback pr...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1549 2024-09-15T17:55:34+00:00 Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks Collie, Jeremy Minto, CóilÃn Worm, Boris Bell, Richard 2013-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/594 https://doi.org/10.5343/bms.2011.1134 https://digitalcommons.uri.edu/context/gsofacpubs/article/1549/viewcontent/Collie_PredationPrerecruits_2013.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/594 doi:10.5343/bms.2011.1134 https://digitalcommons.uri.edu/context/gsofacpubs/article/1549/viewcontent/Collie_PredationPrerecruits_2013.pdf Graduate School of Oceanography Faculty Publications text 2013 ftunivrhodeislan https://doi.org/10.5343/bms.2011.1134 2024-08-21T00:09:33Z Predation by clupeoid species (e.g., Atlantic herring, Clupea harengus Linnaeus, 1758) on the early life stages of gadoids is hypothesized to be an important source of mortality, especially for Atlantic cod, Gadus morhua Linnaeus, 1758. Adult cod also prey on herring, creating a positive feedback process ("trophic triangle") that may result in alternative dominance patterns of cod or herring depending on the relative levels of mortality. We estimated the effect of herring on cod recruitment with a predator-dependent Ricker stock-recruitment function, fit to time-series data. In this formulation, herring gradually reduce the per capita recruitment rate of cod, but this predation does not result in depensatory dynamics. We incorporated this predator-dependent recruitment function into a multispecies length-based model (LeMans) of Georges Bank, northeast US shelf, to investigate the consequences of predation mortality for the recovery of cod from overfishing. In LeMans, all fished species undergo the same size-dependent fishing mortality, following a logistic selection curve. We investigated two fishing patterns: a selective (L 50 = 65 cm) and an unselective fishery (L 50 = 15 cm). The effect of predation on prerecruits was more pronounced under selective fishing because herring were spared as a result of their small size. In rebuilding scenarios with selective fishing, cod started at low abundance and herring at high abundance. Without fishing, cod could rebuild in 10 yrs even with predation mortality before recruitment. In contrast, with low levels of fishing mortality, rebuilding took 25 yrs and even longer with such predation. These results suggest that predation on prerecruits and fishing can combine to delay rebuilding of depleted cod stocks. Text atlantic cod Gadus morhua University of Rhode Island: DigitalCommons@URI Bulletin of Marine Science 89 1 107 122 |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
Predation by clupeoid species (e.g., Atlantic herring, Clupea harengus Linnaeus, 1758) on the early life stages of gadoids is hypothesized to be an important source of mortality, especially for Atlantic cod, Gadus morhua Linnaeus, 1758. Adult cod also prey on herring, creating a positive feedback process ("trophic triangle") that may result in alternative dominance patterns of cod or herring depending on the relative levels of mortality. We estimated the effect of herring on cod recruitment with a predator-dependent Ricker stock-recruitment function, fit to time-series data. In this formulation, herring gradually reduce the per capita recruitment rate of cod, but this predation does not result in depensatory dynamics. We incorporated this predator-dependent recruitment function into a multispecies length-based model (LeMans) of Georges Bank, northeast US shelf, to investigate the consequences of predation mortality for the recovery of cod from overfishing. In LeMans, all fished species undergo the same size-dependent fishing mortality, following a logistic selection curve. We investigated two fishing patterns: a selective (L 50 = 65 cm) and an unselective fishery (L 50 = 15 cm). The effect of predation on prerecruits was more pronounced under selective fishing because herring were spared as a result of their small size. In rebuilding scenarios with selective fishing, cod started at low abundance and herring at high abundance. Without fishing, cod could rebuild in 10 yrs even with predation mortality before recruitment. In contrast, with low levels of fishing mortality, rebuilding took 25 yrs and even longer with such predation. These results suggest that predation on prerecruits and fishing can combine to delay rebuilding of depleted cod stocks. |
format |
Text |
author |
Collie, Jeremy Minto, CóilÃn Worm, Boris Bell, Richard |
spellingShingle |
Collie, Jeremy Minto, CóilÃn Worm, Boris Bell, Richard Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
author_facet |
Collie, Jeremy Minto, CóilÃn Worm, Boris Bell, Richard |
author_sort |
Collie, Jeremy |
title |
Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
title_short |
Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
title_full |
Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
title_fullStr |
Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
title_full_unstemmed |
Predation on Prerecruits Can Delay Rebuilding of Depleted Cod Stocks |
title_sort |
predation on prerecruits can delay rebuilding of depleted cod stocks |
publisher |
DigitalCommons@URI |
publishDate |
2013 |
url |
https://digitalcommons.uri.edu/gsofacpubs/594 https://doi.org/10.5343/bms.2011.1134 https://digitalcommons.uri.edu/context/gsofacpubs/article/1549/viewcontent/Collie_PredationPrerecruits_2013.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/594 doi:10.5343/bms.2011.1134 https://digitalcommons.uri.edu/context/gsofacpubs/article/1549/viewcontent/Collie_PredationPrerecruits_2013.pdf |
op_doi |
https://doi.org/10.5343/bms.2011.1134 |
container_title |
Bulletin of Marine Science |
container_volume |
89 |
container_issue |
1 |
container_start_page |
107 |
op_container_end_page |
122 |
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1810431836042559488 |