Data from: Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast
Svedäng et al 2018 Cod samplesGenotype list.Svedäng et al 2018 genotype data.txt 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...
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Online Access: | https://doi.org/10.5061/dryad.cg10jn5 |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::4c39b7d5553b09553a5816e0f27dde60 2023-05-15T15:27:28+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 2019-01-01 https://doi.org/10.5061/dryad.cg10jn5 en eng Dryad http://dx.doi.org/10.5061/dryad.cg10jn5 https://dx.doi.org/10.5061/dryad.cg10jn5 lic_creative-commons 10.5061/dryad.cg10jn5 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:126124 oai:easy.dans.knaw.nl:easy-dataset:126124 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 spawning conservation egg abundance Recruitment Genetic population structure Fisheries Management Gadus morhua Life sciences medicine and health care Skagerrak Kattegat North Sea envir geo Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2019 fttriple https://doi.org/10.5061/dryad.cg10jn5 2023-01-22T16:53:00Z Svedäng et al 2018 Cod samplesGenotype list.Svedäng et al 2018 genotype data.txt 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. Dataset atlantic cod Gadus morhua Unknown Kattegat ENVELOPE(9.692,9.692,63.563,63.563) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
spawning conservation egg abundance Recruitment Genetic population structure Fisheries Management Gadus morhua Life sciences medicine and health care Skagerrak Kattegat North Sea envir geo |
spellingShingle |
spawning conservation egg abundance Recruitment Genetic population structure Fisheries Management Gadus morhua Life sciences medicine and health care Skagerrak Kattegat North Sea envir geo 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 conservation egg abundance Recruitment Genetic population structure Fisheries Management Gadus morhua Life sciences medicine and health care Skagerrak Kattegat North Sea envir geo |
description |
Svedäng et al 2018 Cod samplesGenotype list.Svedäng et al 2018 genotype data.txt 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. |
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 |
publisher |
Dryad |
publishDate |
2019 |
url |
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_source |
10.5061/dryad.cg10jn5 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:126124 oai:easy.dans.knaw.nl:easy-dataset:126124 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 re3data_____::r3d100000044 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 |
op_relation |
http://dx.doi.org/10.5061/dryad.cg10jn5 https://dx.doi.org/10.5061/dryad.cg10jn5 |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.cg10jn5 |
_version_ |
1766357902299234304 |