Quantifying predation on Baltic cod early life stages
Predation on cod (Gadus morhua) eggs by sprat (Sprattus sprattus) and herring (Clupea harengus) is known to be one of the processes influencing reproductive success of the eastern Baltic cod and has been reported to have contributed to lack of recovery of the stock in the 1990s. This study quantifie...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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2017
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ftdtupubl:oai:pure.atira.dk:publications/360798d0-19dd-449a-b19d-0fef8b445094 2023-09-05T13:19:33+02:00 Quantifying predation on Baltic cod early life stages Neumann, Viola Schaber, Matthias Eero, Margit Böttcher, Uwe Köster, Fritz 2017 application/pdf https://orbit.dtu.dk/en/publications/360798d0-19dd-449a-b19d-0fef8b445094 https://doi.org/10.1139/cjfas-2016-0215 https://backend.orbit.dtu.dk/ws/files/127978775/Postprint.pdf eng eng info:eu-repo/semantics/openAccess Neumann , V , Schaber , M , Eero , M , Böttcher , U & Köster , F 2017 , ' Quantifying predation on Baltic cod early life stages ' , Canadian Journal of Fisheries and Aquatic Sciences , vol. 74 , no. 6 , pp. 833-842 . https://doi.org/10.1139/cjfas-2016-0215 article 2017 ftdtupubl https://doi.org/10.1139/cjfas-2016-0215 2023-08-16T22:56:39Z Predation on cod (Gadus morhua) eggs by sprat (Sprattus sprattus) and herring (Clupea harengus) is known to be one of the processes influencing reproductive success of the eastern Baltic cod and has been reported to have contributed to lack of recovery of the stock in the 1990s. This study quantifies the predation on cod eggs in the Bornholm Basin, the major spawning area of cod in the central Baltic Sea, in the 1990s in comparison with the second half of the 2000s. The analyses involve estimating daily consumption rates of predator populations, which are then compared with corresponding daily egg production rates. As a methodological advancement compared with earlier studies, spatially resolved information on predator distribution and abundance is utilized in quantifying predator stock size. This resulted in more realistic consumption estimates in relation to overall egg production compared with earlier studies that consistently overestimated predation pressure by clupeids. Our results suggest a generally lower predation pressure on cod eggs in the mid- to late 2000s, due to a combination of reduced predator abundance and lower daily rations by individual predators Article in Journal/Newspaper Gadus morhua Technical University of Denmark: DTU Orbit Canadian Journal of Fisheries and Aquatic Sciences 74 6 833 842 |
institution |
Open Polar |
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Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Predation on cod (Gadus morhua) eggs by sprat (Sprattus sprattus) and herring (Clupea harengus) is known to be one of the processes influencing reproductive success of the eastern Baltic cod and has been reported to have contributed to lack of recovery of the stock in the 1990s. This study quantifies the predation on cod eggs in the Bornholm Basin, the major spawning area of cod in the central Baltic Sea, in the 1990s in comparison with the second half of the 2000s. The analyses involve estimating daily consumption rates of predator populations, which are then compared with corresponding daily egg production rates. As a methodological advancement compared with earlier studies, spatially resolved information on predator distribution and abundance is utilized in quantifying predator stock size. This resulted in more realistic consumption estimates in relation to overall egg production compared with earlier studies that consistently overestimated predation pressure by clupeids. Our results suggest a generally lower predation pressure on cod eggs in the mid- to late 2000s, due to a combination of reduced predator abundance and lower daily rations by individual predators |
format |
Article in Journal/Newspaper |
author |
Neumann, Viola Schaber, Matthias Eero, Margit Böttcher, Uwe Köster, Fritz |
spellingShingle |
Neumann, Viola Schaber, Matthias Eero, Margit Böttcher, Uwe Köster, Fritz Quantifying predation on Baltic cod early life stages |
author_facet |
Neumann, Viola Schaber, Matthias Eero, Margit Böttcher, Uwe Köster, Fritz |
author_sort |
Neumann, Viola |
title |
Quantifying predation on Baltic cod early life stages |
title_short |
Quantifying predation on Baltic cod early life stages |
title_full |
Quantifying predation on Baltic cod early life stages |
title_fullStr |
Quantifying predation on Baltic cod early life stages |
title_full_unstemmed |
Quantifying predation on Baltic cod early life stages |
title_sort |
quantifying predation on baltic cod early life stages |
publishDate |
2017 |
url |
https://orbit.dtu.dk/en/publications/360798d0-19dd-449a-b19d-0fef8b445094 https://doi.org/10.1139/cjfas-2016-0215 https://backend.orbit.dtu.dk/ws/files/127978775/Postprint.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Neumann , V , Schaber , M , Eero , M , Böttcher , U & Köster , F 2017 , ' Quantifying predation on Baltic cod early life stages ' , Canadian Journal of Fisheries and Aquatic Sciences , vol. 74 , no. 6 , pp. 833-842 . https://doi.org/10.1139/cjfas-2016-0215 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1139/cjfas-2016-0215 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
74 |
container_issue |
6 |
container_start_page |
833 |
op_container_end_page |
842 |
_version_ |
1776200344236195840 |