Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea

The present thesis deals with patterns in depth and habitat use, seasonal and depthspecific food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea (WBS). Cod is the commercially most important demersal species in the WBS and therefore also of pronounced scientific interest. Despit...

Full description

Bibliographic Details
Main Author: Funk, Steffen
Other Authors: Möllmann, Christian (Prof. Dr.)
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky 2020
Subjects:
cod
Online Access:http://nbn-resolving.de/urn:nbn:de:gbv:18-104144
https://ediss.sub.uni-hamburg.de/handle/ediss/8379
id ftsubhamburg:oai:ediss.sub.uni-hamburg.de:ediss/8379
record_format openpolar
spelling ftsubhamburg:oai:ediss.sub.uni-hamburg.de:ediss/8379 2023-05-15T16:18:58+02:00 Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea Räumlich-zeitliche Verteilung, Nahrungsaufnahme und Wachstum des Dorsches (Gadus morhua L.) in der Westlichen Ostsee Funk, Steffen Möllmann, Christian (Prof. Dr.) 2020-01-01 http://nbn-resolving.de/urn:nbn:de:gbv:18-104144 https://ediss.sub.uni-hamburg.de/handle/ediss/8379 eng eng Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky http://nbn-resolving.de/urn:nbn:de:gbv:18-104144 https://ediss.sub.uni-hamburg.de/handle/ediss/8379 http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess No license Habitatnutzung Mageninhaltsanalysen Nahrungszusammensetzung cod habitat use stomach analyse diet composition 570 Biowissenschaften Biologie 42.81 Pisces 42.94 Meeresbiologie Ostsee Kabeljau Nahrungsaufnahme Wachstum ddc:570 doctoralThesis doc-type:doctoralThesis 2020 ftsubhamburg 2022-11-09T07:11:44Z The present thesis deals with patterns in depth and habitat use, seasonal and depthspecific food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea (WBS). Cod is the commercially most important demersal species in the WBS and therefore also of pronounced scientific interest. Despite decades of research and stock monitoring important knowledge gaps still remain, limiting our understanding of the ecology of cod in the WBS. The results presented in this thesis reveal the important role of shallow water habitats in the seasonal depth use of cod in the Western Baltic, their essential role for the seasonal food intake and thus, their important impact on the seasonal growth of cod. Furthermore, the effect of extreme summer periods in relation to habitat selection and resulting negative effects on seasonal growth are discussed. Finally, it is shown that the methods presented in the study such as (a) using fishers’ knowledge to reveal patterns in depth use, (b) using different fishing methods to enhance depth and habitat coverage in stomach sampling in order to analyze depth-specific patterns in food intake, and (c) using individual-based bioenergetic growth models to detect seasonal patterns in growth, can enhance our ecological knowledge not only for cod in the Baltic Sea, but provide practical approaches to be used also in other ecosystems and for other species. Die vorliegende Dissertation befasst sich mit Mustern in der Tiefen- und HabitatNutzung, der saisonalen und tiefenspezifischen Ernährung sowie dem Wachstum des Dorsches (Gadus morhua L.) in der westlichen Ostsee. In der westlichen Ostsee ist der Dorsch die kommerziell wichtigste, demersale Fischart und daher von einem großen wissenschaftlichen Interesse. Trotz jahrzehntelanger Forschung und jährlichem Bestandsmonitoring bestehen immer noch wesentliche Wissenslücken im Verständnis der Ökologie des Dorsches in der westlichen Ostsee. Die Ergebnisse der vorliegenden Arbeit veranschaulichen die große Bedeutung von Flachwasserhabitaten in der ... Doctoral or Postdoctoral Thesis Gadus morhua kabeljau ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky)
institution Open Polar
collection ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky)
op_collection_id ftsubhamburg
language English
topic Habitatnutzung
Mageninhaltsanalysen
Nahrungszusammensetzung
cod
habitat use
stomach analyse
diet composition
570 Biowissenschaften
Biologie
42.81 Pisces
42.94 Meeresbiologie
Ostsee
Kabeljau
Nahrungsaufnahme
Wachstum
ddc:570
spellingShingle Habitatnutzung
Mageninhaltsanalysen
Nahrungszusammensetzung
cod
habitat use
stomach analyse
diet composition
570 Biowissenschaften
Biologie
42.81 Pisces
42.94 Meeresbiologie
Ostsee
Kabeljau
Nahrungsaufnahme
Wachstum
ddc:570
Funk, Steffen
Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
topic_facet Habitatnutzung
Mageninhaltsanalysen
Nahrungszusammensetzung
cod
habitat use
stomach analyse
diet composition
570 Biowissenschaften
Biologie
42.81 Pisces
42.94 Meeresbiologie
Ostsee
Kabeljau
Nahrungsaufnahme
Wachstum
ddc:570
description The present thesis deals with patterns in depth and habitat use, seasonal and depthspecific food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea (WBS). Cod is the commercially most important demersal species in the WBS and therefore also of pronounced scientific interest. Despite decades of research and stock monitoring important knowledge gaps still remain, limiting our understanding of the ecology of cod in the WBS. The results presented in this thesis reveal the important role of shallow water habitats in the seasonal depth use of cod in the Western Baltic, their essential role for the seasonal food intake and thus, their important impact on the seasonal growth of cod. Furthermore, the effect of extreme summer periods in relation to habitat selection and resulting negative effects on seasonal growth are discussed. Finally, it is shown that the methods presented in the study such as (a) using fishers’ knowledge to reveal patterns in depth use, (b) using different fishing methods to enhance depth and habitat coverage in stomach sampling in order to analyze depth-specific patterns in food intake, and (c) using individual-based bioenergetic growth models to detect seasonal patterns in growth, can enhance our ecological knowledge not only for cod in the Baltic Sea, but provide practical approaches to be used also in other ecosystems and for other species. Die vorliegende Dissertation befasst sich mit Mustern in der Tiefen- und HabitatNutzung, der saisonalen und tiefenspezifischen Ernährung sowie dem Wachstum des Dorsches (Gadus morhua L.) in der westlichen Ostsee. In der westlichen Ostsee ist der Dorsch die kommerziell wichtigste, demersale Fischart und daher von einem großen wissenschaftlichen Interesse. Trotz jahrzehntelanger Forschung und jährlichem Bestandsmonitoring bestehen immer noch wesentliche Wissenslücken im Verständnis der Ökologie des Dorsches in der westlichen Ostsee. Die Ergebnisse der vorliegenden Arbeit veranschaulichen die große Bedeutung von Flachwasserhabitaten in der ...
author2 Möllmann, Christian (Prof. Dr.)
format Doctoral or Postdoctoral Thesis
author Funk, Steffen
author_facet Funk, Steffen
author_sort Funk, Steffen
title Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
title_short Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
title_full Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
title_fullStr Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
title_full_unstemmed Spatio-temporal distribution, food intake and growth of cod (Gadus morhua L.) in the Western Baltic Sea
title_sort spatio-temporal distribution, food intake and growth of cod (gadus morhua l.) in the western baltic sea
publisher Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky
publishDate 2020
url http://nbn-resolving.de/urn:nbn:de:gbv:18-104144
https://ediss.sub.uni-hamburg.de/handle/ediss/8379
genre Gadus morhua
kabeljau
genre_facet Gadus morhua
kabeljau
op_relation http://nbn-resolving.de/urn:nbn:de:gbv:18-104144
https://ediss.sub.uni-hamburg.de/handle/ediss/8379
op_rights http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
No license
_version_ 1766005261996130304