Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast
Dramatic and persistent reductions in Atlantic cod (Gadus morhua) are common in many coastal areas. While offshore cod stocks still were abundant and productive, the Swedish west coast showed signs of diminishing adult cod abundance at the beginning of the 1980s, where the local cod component was co...
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ftzenodo:oai:zenodo.org:4946397 2023-05-15T15:27:26+02:00 Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast Svedäng, Henrik Barth, Julia M. I. Svenson, Anders Jonsson, Patrik Jentoft, Sissel Knutsen, Halvor André, Carl 2019-03-06 https://zenodo.org/record/4946397 https://doi.org/10.5061/dryad.cg10jn5 unknown doi:10.1093/icesjms/fsy166 https://zenodo.org/communities/dryad https://zenodo.org/record/4946397 https://doi.org/10.5061/dryad.cg10jn5 oai:zenodo.org:4946397 info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode spawning egg abundance Genetic population structure info:eu-repo/semantics/other dataset 2019 ftzenodo https://doi.org/10.5061/dryad.cg10jn510.1093/icesjms/fsy166 2023-03-10T15:47:43Z Dramatic and persistent reductions in Atlantic cod (Gadus morhua) are common in many coastal areas. While offshore cod stocks still were abundant and productive, the Swedish west coast showed signs of diminishing adult cod abundance at the beginning of the 1980s, where the local cod component was considered to be extirpated. To survey the present cod spawning activity and stock composition, we initiated egg trawling over two consecutive years (203 hauls in total) in combination with population genetic analyses (425 individually genotyped eggs). Here, we provide evidence of cod spawning at the Swedish Skagerrak coast, suggesting recolonization or that local cod has recovered from a nearly depleted state. Early stage eggs were found inside fjords too far to have been transported by oceanic drift from offshore spawning areas. The cod eggs were genetically similar in early to late life-stages and cluster mainly with the local adult cod, indicating that eggs and adults belong to the same genetic unit. The cod eggs were genetically differentiated from adult North Sea cod, and, to a lesser degree, also from the Kattegat and Öresund cod, i.e. indicating a possible recovery of local coastal stock. The patterns of the genetic structure in the inshore areas are, however, difficult to fully disentangle, as Atlantic cod in the North Sea-Skagerrak area seem to be a mixture of co-existing forms: local cod completing their entire life cycle in fjords and sheltered areas, and oceanic populations showing homing behaviours. The egg abundances are considerably lower compared with what is found in similar studies along the Norwegian Skagerrak coast. Nevertheless, the discovery of locally spawning cod along the Swedish west coast—although at low biomasses—is an encouraging finding that highlights the needs for endurance in protective measures and of detailed surveys to secure intraspecific biodiversity and ecosystem services. Svedäng et al 2018 Cod samplesGenotype list.Svedäng et al 2018 genotype data.txt Dataset atlantic cod Gadus morhua Zenodo Kattegat ENVELOPE(9.692,9.692,63.563,63.563) |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
spawning egg abundance Genetic population structure |
spellingShingle |
spawning egg abundance Genetic population structure Svedäng, Henrik Barth, Julia M. I. Svenson, Anders Jonsson, Patrik Jentoft, Sissel Knutsen, Halvor André, Carl Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
topic_facet |
spawning egg abundance Genetic population structure |
description |
Dramatic and persistent reductions in Atlantic cod (Gadus morhua) are common in many coastal areas. While offshore cod stocks still were abundant and productive, the Swedish west coast showed signs of diminishing adult cod abundance at the beginning of the 1980s, where the local cod component was considered to be extirpated. To survey the present cod spawning activity and stock composition, we initiated egg trawling over two consecutive years (203 hauls in total) in combination with population genetic analyses (425 individually genotyped eggs). Here, we provide evidence of cod spawning at the Swedish Skagerrak coast, suggesting recolonization or that local cod has recovered from a nearly depleted state. Early stage eggs were found inside fjords too far to have been transported by oceanic drift from offshore spawning areas. The cod eggs were genetically similar in early to late life-stages and cluster mainly with the local adult cod, indicating that eggs and adults belong to the same genetic unit. The cod eggs were genetically differentiated from adult North Sea cod, and, to a lesser degree, also from the Kattegat and Öresund cod, i.e. indicating a possible recovery of local coastal stock. The patterns of the genetic structure in the inshore areas are, however, difficult to fully disentangle, as Atlantic cod in the North Sea-Skagerrak area seem to be a mixture of co-existing forms: local cod completing their entire life cycle in fjords and sheltered areas, and oceanic populations showing homing behaviours. The egg abundances are considerably lower compared with what is found in similar studies along the Norwegian Skagerrak coast. Nevertheless, the discovery of locally spawning cod along the Swedish west coast—although at low biomasses—is an encouraging finding that highlights the needs for endurance in protective measures and of detailed surveys to secure intraspecific biodiversity and ecosystem services. Svedäng et al 2018 Cod samplesGenotype list.Svedäng et al 2018 genotype data.txt |
format |
Dataset |
author |
Svedäng, Henrik Barth, Julia M. I. Svenson, Anders Jonsson, Patrik Jentoft, Sissel Knutsen, Halvor André, Carl |
author_facet |
Svedäng, Henrik Barth, Julia M. I. Svenson, Anders Jonsson, Patrik Jentoft, Sissel Knutsen, Halvor André, Carl |
author_sort |
Svedäng, Henrik |
title |
Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
title_short |
Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
title_full |
Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
title_fullStr |
Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
title_full_unstemmed |
Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast |
title_sort |
data from: local cod (gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the swedish skagerrak coast |
publishDate |
2019 |
url |
https://zenodo.org/record/4946397 https://doi.org/10.5061/dryad.cg10jn5 |
long_lat |
ENVELOPE(9.692,9.692,63.563,63.563) |
geographic |
Kattegat |
geographic_facet |
Kattegat |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
doi:10.1093/icesjms/fsy166 https://zenodo.org/communities/dryad https://zenodo.org/record/4946397 https://doi.org/10.5061/dryad.cg10jn5 oai:zenodo.org:4946397 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.cg10jn510.1093/icesjms/fsy166 |
_version_ |
1766357866025844736 |