Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua)
Abstract Cod is usually monitored for scientific purposes using bottom trawl surveys, although its regular pelagic occurrence is well documented. Here we analysed, using Generalized Additive Models, the spatio-temporal changes in the Eastern Baltic cod adult population using pelagic catches from an...
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Language: | English |
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Oxford University Press (OUP)
2019
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsz016 http://academic.oup.com/icesjms/article-pdf/76/6/1591/31247079/fsz016.pdf |
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croxfordunivpr:10.1093/icesjms/fsz016 2023-05-15T16:19:15+02:00 Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) Casini, Michele Tian, Huidong Hansson, Martin Grygiel, Włodzimierz Strods, Guntars Statkus, Romas Sepp, Elor Gröhsler, Tomas Orio, Alessandro Larson, Niklas Kraak, Sarah Swedish Environmental Protection Agency Swedish Agency for Marine and Water Management Swedish Research Council Formas 2019 http://dx.doi.org/10.1093/icesjms/fsz016 http://academic.oup.com/icesjms/article-pdf/76/6/1591/31247079/fsz016.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 76, issue 6, page 1591-1600 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2019 croxfordunivpr https://doi.org/10.1093/icesjms/fsz016 2022-09-30T10:06:31Z Abstract Cod is usually monitored for scientific purposes using bottom trawl surveys, although its regular pelagic occurrence is well documented. Here we analysed, using Generalized Additive Models, the spatio-temporal changes in the Eastern Baltic cod adult population using pelagic catches from an acoustic survey covering 37 years and the whole central Baltic Sea. Our analysis shows that in the northern areas cod catch per unit effort (CPUE, kg h-1) was high in the early 1980s whereas it dropped and remained very low thereafter. Conversely, in the southernmost area CPUE largely oscillated after the early 1990s. Our model was able to capture key ecological features of the Baltic cod such as preferred depth of occurrence and response to hypoxic conditions. The model also revealed a clear daily cycle of CPUEs, indicating diel vertical migrations at the population level. The temporal trends of pelagic CPUEs generally followed those from the bottom trawl surveys, although differences were observed especially in the recent years with a relative decline in the cod occurring in the pelagic waters. Our results point to the great potential of acoustic survey trawl catches to complement bottom trawl surveys for investigating the spatio-temporal population dynamics and behaviour of the Baltic cod. Article in Journal/Newspaper Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science 76 6 1591 1600 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
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 Casini, Michele Tian, Huidong Hansson, Martin Grygiel, Włodzimierz Strods, Guntars Statkus, Romas Sepp, Elor Gröhsler, Tomas Orio, Alessandro Larson, Niklas Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Cod is usually monitored for scientific purposes using bottom trawl surveys, although its regular pelagic occurrence is well documented. Here we analysed, using Generalized Additive Models, the spatio-temporal changes in the Eastern Baltic cod adult population using pelagic catches from an acoustic survey covering 37 years and the whole central Baltic Sea. Our analysis shows that in the northern areas cod catch per unit effort (CPUE, kg h-1) was high in the early 1980s whereas it dropped and remained very low thereafter. Conversely, in the southernmost area CPUE largely oscillated after the early 1990s. Our model was able to capture key ecological features of the Baltic cod such as preferred depth of occurrence and response to hypoxic conditions. The model also revealed a clear daily cycle of CPUEs, indicating diel vertical migrations at the population level. The temporal trends of pelagic CPUEs generally followed those from the bottom trawl surveys, although differences were observed especially in the recent years with a relative decline in the cod occurring in the pelagic waters. Our results point to the great potential of acoustic survey trawl catches to complement bottom trawl surveys for investigating the spatio-temporal population dynamics and behaviour of the Baltic cod. |
author2 |
Kraak, Sarah Swedish Environmental Protection Agency Swedish Agency for Marine and Water Management Swedish Research Council Formas |
format |
Article in Journal/Newspaper |
author |
Casini, Michele Tian, Huidong Hansson, Martin Grygiel, Włodzimierz Strods, Guntars Statkus, Romas Sepp, Elor Gröhsler, Tomas Orio, Alessandro Larson, Niklas |
author_facet |
Casini, Michele Tian, Huidong Hansson, Martin Grygiel, Włodzimierz Strods, Guntars Statkus, Romas Sepp, Elor Gröhsler, Tomas Orio, Alessandro Larson, Niklas |
author_sort |
Casini, Michele |
title |
Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
title_short |
Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
title_full |
Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
title_fullStr |
Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
title_full_unstemmed |
Spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the Eastern Baltic Sea cod (Gadus morhua) |
title_sort |
spatio-temporal dynamics and behavioural ecology of a “demersal” fish population as detected using research survey pelagic trawl catches: the eastern baltic sea cod (gadus morhua) |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/icesjms/fsz016 http://academic.oup.com/icesjms/article-pdf/76/6/1591/31247079/fsz016.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 76, issue 6, page 1591-1600 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsz016 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
6 |
container_start_page |
1591 |
op_container_end_page |
1600 |
_version_ |
1766005612630507520 |