Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea
Some of the best studied fish species with the longest monitored stock time series worldwide occur in the North Atlantic. Over the decades numerous publications added knowledge to our understanding of ecology and behaviour of these fish species and stocks. However, there are also gaps in knowledge,...
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Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky
2021
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ftsubhamburg:oai:ediss.sub.uni-hamburg.de:ediss/9162 2023-05-15T15:27:48+02:00 Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea Haase, Stefanie Temming, Axel Krumme, Uwe 2021-01-01 http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-94659 https://ediss.sub.uni-hamburg.de/handle/ediss/9162 eng eng Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-94659 https://ediss.sub.uni-hamburg.de/handle/ediss/9162 http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ CC-BY 570: Biowissenschaften Biologie ddc:570: doctoralThesis doc-type:doctoralThesis 2021 ftsubhamburg 2022-11-09T07:11:54Z Some of the best studied fish species with the longest monitored stock time series worldwide occur in the North Atlantic. Over the decades numerous publications added knowledge to our understanding of ecology and behaviour of these fish species and stocks. However, there are also gaps in knowledge, obvious uncertainties in ecological interactions and potential biases. These are rarely profoundly questioned unless environmental changes or inconsistent stock assessment results challenge our established points of view. In the Baltic Sea, Atlantic cod (Gadus morhua L.) has been intensively surveyed and investigated for decades. Yet, our understanding of this marine species living in a semi-enclosed, brackish environment is still incomplete. For example, despite numerous otolith exchanges to improve the age reading and large scientific efforts to understand the ecology of Baltic cod, the analytical stock assessment of the Eastern Baltic cod (EBC) stock was suspended in 2014; obviously age data were uncertain and the aut- and synecological knowledge was incomplete to explain the changes occurring in this stock in distress. For instance, spreading hypoxic areas in the central Baltic basins forced EBC to contract in the southern Baltic Sea but behaviour and movements of cod in response to the consequences are poorly understood. This dissertation aims at providing a more thorough understanding of cod ecology in the southern Baltic Sea, with a particular focus on patterns in movements of wild, free-ranging cod and validation of ring patterns in otoliths. Tagging performance, data storage tags recording depth and ambient temperature and otoliths of recaptured cod were analysed. Tagged cod had been released in the southern Baltic Sea within the scope of the international mark-recapture project TABACOD (“Tagging Baltic cod”). In chapter 1 (“Short-term tagging mortality of Baltic cod (Gadus morhua)”) the post-release short-term mortality of cod after tagging with T-bar tags and tetracycline was assessed. The mortality ... Doctoral or Postdoctoral Thesis atlantic cod Gadus morhua North Atlantic ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) |
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ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) |
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ftsubhamburg |
language |
English |
topic |
570: Biowissenschaften Biologie ddc:570: |
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570: Biowissenschaften Biologie ddc:570: Haase, Stefanie Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
topic_facet |
570: Biowissenschaften Biologie ddc:570: |
description |
Some of the best studied fish species with the longest monitored stock time series worldwide occur in the North Atlantic. Over the decades numerous publications added knowledge to our understanding of ecology and behaviour of these fish species and stocks. However, there are also gaps in knowledge, obvious uncertainties in ecological interactions and potential biases. These are rarely profoundly questioned unless environmental changes or inconsistent stock assessment results challenge our established points of view. In the Baltic Sea, Atlantic cod (Gadus morhua L.) has been intensively surveyed and investigated for decades. Yet, our understanding of this marine species living in a semi-enclosed, brackish environment is still incomplete. For example, despite numerous otolith exchanges to improve the age reading and large scientific efforts to understand the ecology of Baltic cod, the analytical stock assessment of the Eastern Baltic cod (EBC) stock was suspended in 2014; obviously age data were uncertain and the aut- and synecological knowledge was incomplete to explain the changes occurring in this stock in distress. For instance, spreading hypoxic areas in the central Baltic basins forced EBC to contract in the southern Baltic Sea but behaviour and movements of cod in response to the consequences are poorly understood. This dissertation aims at providing a more thorough understanding of cod ecology in the southern Baltic Sea, with a particular focus on patterns in movements of wild, free-ranging cod and validation of ring patterns in otoliths. Tagging performance, data storage tags recording depth and ambient temperature and otoliths of recaptured cod were analysed. Tagged cod had been released in the southern Baltic Sea within the scope of the international mark-recapture project TABACOD (“Tagging Baltic cod”). In chapter 1 (“Short-term tagging mortality of Baltic cod (Gadus morhua)”) the post-release short-term mortality of cod after tagging with T-bar tags and tetracycline was assessed. The mortality ... |
author2 |
Temming, Axel Krumme, Uwe |
format |
Doctoral or Postdoctoral Thesis |
author |
Haase, Stefanie |
author_facet |
Haase, Stefanie |
author_sort |
Haase, Stefanie |
title |
Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
title_short |
Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
title_full |
Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
title_fullStr |
Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
title_full_unstemmed |
Interlinked patterns in movements and otolith formation of cod (Gadus morhua) in the southern Baltic Sea |
title_sort |
interlinked patterns in movements and otolith formation of cod (gadus morhua) in the southern baltic sea |
publisher |
Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky |
publishDate |
2021 |
url |
http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-94659 https://ediss.sub.uni-hamburg.de/handle/ediss/9162 |
genre |
atlantic cod Gadus morhua North Atlantic |
genre_facet |
atlantic cod Gadus morhua North Atlantic |
op_relation |
http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-94659 https://ediss.sub.uni-hamburg.de/handle/ediss/9162 |
op_rights |
http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766358214813679616 |