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Ecology of juvenile turbot and flounder in the Central Baltic Sea: Implications for recruitment
Stockholm University, Faculty of Science, Department of Systems Ecology.
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Our understanding of turbot and flounder ecology in the Baltic Sea is insufficient for sound management decisions. This thesis aims to fill some gaps in current knowledge by providing information of the ecology of turbot and flounder within their juvenile habitat, and to relate these findings to issues assumed relevant for recruitment variation. Main focus is on turbot due to its relatively low abundance and high variability in recruitment. The distribution of both species was studied on different scales, as was environmental effects on food consumption in 0-group turbot. The 0-group turbot display a relatively restricted spatial distribution compared to flounder. This is possibly due to a more specialized diet, which may make them more vulnerable to habitat degradation, especially eutrophication as a strong negative correlation was found with the organic content in the sediment. The species show high temporal and spatial overlap when settling in July-September, with peak abundances in August, and at depths <1 m. Both species display sedentary behavior within the nursery ground. Compared to flounder, turbot was more mobile potentially due to its restricted diet calling for extended searches. For turbot, feeding conditions appear to vary between size groups, which potentially could cause variations in survival between years through size-selective mortality. But, the predation may be low in central Baltic Sea as the abundance of the main predator, brown shrimp are comparatively low during flatfish occupancy. A significant positive relationship was found between the recruitment of turbot and flounder, which suggests that no inter-specific interactions during the juvenile stage affect recruitment. This co-variation also suggests that the recruitment of the species is determined by the same phenomena, potentially by large scale abiotic factors during the egg- and larval stage. For turbot, additional variability is potentially generated during the juvenile stage due to its relatively restricted food and habitat requirements. The specific habitat demands of turbot revealed in this thesis may be used to protect and restore essentially nursery grounds.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University , 2011. , 33 p.
Keyword [en]
Psetta maxima, Platichthys flesus, juvenile, Baltic Sea, nursery ground, distribution, recruitment
National Category
Ecology
Research subject
Marine Ecology
Identifiers
URN: urn:nbn:se:su:diva-63833ISBN: 978-91-7447-402-2 (print)OAI: oai:DiVA.org:su-63833DiVA: diva2:452813
Public defence
2011-12-16, Ahlmansalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (Swedish)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted. Paper 3: Submitted. Paper 4: Submitted.Available from: 2011-11-24 Created: 2011-10-31 Last updated: 2011-11-02Bibliographically approved
List of papers
1. Habitat associations of 0-group turbot (Psetta maxima) and flounder (Platichthys flesus) at Gotland, Central Baltic Sea
Open this publication in new window or tab >>Habitat associations of 0-group turbot (Psetta maxima) and flounder (Platichthys flesus) at Gotland, Central Baltic Sea
(English)Article in journal (Refereed) Submitted
Keyword
Psetta maxima, Platichthys flesus, Baltic Sea, distribution
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-63832 (URN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2011-11-02Bibliographically approved
2. Nursery area utilization by 0-group turbot (Psetta maxima) and flounder (Platichthys flesus) at Gotland, Baltic Sea
Open this publication in new window or tab >>Nursery area utilization by 0-group turbot (Psetta maxima) and flounder (Platichthys flesus) at Gotland, Baltic Sea
2011 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 16, no 1, 60-70 p.Article in journal (Refereed) Published
Keyword
Psetta maxima, Platichthys flesus, Baltic Sea, distribution
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-63825 (URN)000287958600005 ()
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2017-12-08Bibliographically approved
3. The potential of Visible Implant Elastomer as a nursery role evaluation tool for 0-group turbot (Psetta maxima) and flounder
Open this publication in new window or tab >>The potential of Visible Implant Elastomer as a nursery role evaluation tool for 0-group turbot (Psetta maxima) and flounder
(English)Article in journal (Refereed) Submitted
Keyword
Psetta maxima, Platichthys flesus, Baltic Sea, movement patterns, nursery ground
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-63830 (URN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2011-11-02Bibliographically approved
4. Potential food limitation of 0-group turbot: A bioenergetics approach
Open this publication in new window or tab >>Potential food limitation of 0-group turbot: A bioenergetics approach
(English)Article in journal (Refereed) Submitted
Keyword
Psetta maxima, Baltic Sea, consumption, bioenergetics, nursery ground
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-63831 (URN)
Available from: 2011-10-31 Created: 2011-10-31 Last updated: 2011-11-02Bibliographically approved

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