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  • 1
    Keywords: Marine biology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (96 pages)
    Edition: 1st ed.
    ISBN: 9789289346658
    Series Statement: TemaNord
    DDC: 574.91999999999996
    Language: English
    Note: Intro -- Essential fish habitats (EFH) -- Contents -- Preface -- Summary -- 1. General background -- 2. Project objectives -- 3. Venue, participants and outline of the workshop -- 4. Outcome of the workshop -- 4.1 General evidence for relationships between habitat and population size -- 4.1.1 Case studies on the importance of EFH -- 4.1.2 Summary and conclusions of Theme 1 -- 4.2 Mapping and monitoring of EFH -- 4.2.1 Case studies -- 4.2.2 Questions regarding Theme 2 -- 4.2.3 Summary and conclusions of Theme 2 -- 4.3 Conservation of and threats to EFH -- 4.3.1 Threats to EFH -- 4.3.2 Current protection of EFH -- 4.3.3 Current management of EFH -- 5. General conclusions -- 6. Future work -- 7. Communication -- References -- Svensk sammanfattning -- Appendix 1 - Participants list -- Appendix 2 - Schedule of the workshop -- Appendix 3 - Abstracts from presentations -- Abstract Jens Olsson:Introduction to the workshop -- Abstracts from Theme 1 - The role of essential coastal habitats for fish - availability of quantitative evidence showing the importance of coastal habitats for fish stocks -- Abstract Göran Sundblad -- Habitat population size relationships -- References -- Abstract: Støttrup, J.G., Sørensen, T.K., Egekvist, J., Vinther, M., Brown, J.E., Dinesen, G.E. and Hansen, F.I. -- How can we quantify the importance of coastal habitats for fish stocks? -- Abstract: Henri Jokinen -- Essential habitats and (unresolved) links to fish stocks on the Finnish coast: examples from flounder studies -- Abstract: Didzis Ustups, Ann-Britt Florin, Ulf Bergström and colleagues from BIOR -- Habitat use by early life stages of flounder in the Central Baltic Sea -- Abstract: Rohtla, M., Vetemaa, M., Svirgsden, R., Taal, I., Saks, L. and Verliin, A. -- Spawning habitat preference of Väinameri pike, ide and burbot -- Abstract: Timo Arula. , Clupeid spawning ground surveys in the NE Baltic Sea -- Abstract from Theme 2 - How are essential habitats for fish mapped and monitored? Methods, available maps, are there data for maps? -- Abstract: Meri Kallasvuo -- Using high-resolution species distribution modelling to produce reproduction habitat maps of coastal fish to support marine spatial planning -- Abstracts from Theme 3 - Conservation and threats on essential coastal habitats for fish -- Abstract: Patrik Kraufvelin -- Physical threats to essential coastal habitats for fish -- Abstract: Ulf Bergström -- Essential fish habitats in management -- Abstract: Antti Lappalainen, Meri Kallasvuo -- Conservation and threats on essential coastal habitats for fish - Finland -- Abstract: Elliot John Brown -- Conservation and threats on essential coastal habitats for fish: The need for protection of essential fish habitats -- Abstract: Linas Ložys and Justas Dainys -- Essential coastal habitats for fish in Lithuania: Threats and conservation -- Abstract: Martin Snickars -- Coastal lagoons - vulnerable nursery habitats -- Abstracts: Peter Möller -- Bottom habitat measures within the coastal areas of the State of Mecklenburg-Western Pomerania -- Projects of the Institute of Fisheries, State Research Centre of Agriculture and Fisheries and the Research Association Fish and Environment -- Abstract: Saks, L., Vetemaa, M., Taal, I., Verliin, A. & -- Rohtla, M. -- Coastal marine habitats and their conservation status in Estonia -- Abstract: Zusana Celmer -- Coastal fish habitats - the Puck bay case -- Appendix 4 - Information from Baltic Sea countries about mapping and monitoring of essential fish habitats -- Essential fish habitats (EFH).
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  • 2
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    PANGAEA
    In:  Supplement to: Hinrichsen, Hans-Harald; Lehmann, Andreas; Petereit, Christoph; Nissling, Anders; Ustups, Didzis; Bergström, Ulf; Hüssy, Karin (2016): Spawning areas of eastern Baltic cod revisited: Using hydrodynamic modelling to reveal spawning habitat suitability, egg survival probability, and connectivity patterns. Progress in Oceanography, 143, 13-25, https://doi.org/10.1016/j.pocean.2016.02.004
    Publication Date: 2023-01-13
    Description: The files contain the data according to the figures in the publication.
    Type: Dataset
    Format: application/zip, 84.9 kBytes
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  • 3
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    PANGAEA
    In:  Supplement to: Hinrichsen, Hans-Harald; von Dewitz, Burkhard; Lehmann, Andreas; Bergström, Ulf; Hüssy, Karin (2017): Spatio-temporal dynamics of cod nursery areas in the Baltic Sea. Progress in Oceanography, https://doi.org/10.1016/j.pocean.2017.05.007
    Publication Date: 2023-04-18
    Description: In this study the drift of eastern Baltic cod larvae and juveniles spawned within the historical eastern Baltic cod spawning grounds was investigated by detailed drift model simulations for the years 1971 to 2010, to examine the spatio-temporal dynamics of environmental suitability in the nursery areas of juvenile cod settlement. The results of the long-term model scenario runs, where juvenile cod were treated as simulated passively drifting particles, enabled us to find strong indications for long-term variations of settlement and potentially the reproduction success of the historically important eastern Baltic cod nursery grounds. Only low proportions of juveniles hatched in the Arkona Basin and in the Gotland Basin were able to settle in their respective spawning ground. Ocean currents were either unfavorable for the juveniles to reach suitable habitats or transported the juveniles to nursery grounds of neighboring subdivisions. Juveniles which hatched in the Bornholm Basin were most widely dispersed and showed the highest settlement probability, while the second highest settlement probability and horizontal dispersal was observed for juveniles originating from the Gdansk Deep. In a long-term perspective, wind-driven transport of larvae/juveniles positively affected the settlement success predominately in the Bornholm Basin and in the Bay of Gdansk. The Bornholm Basin has the potential to contribute on average 54 % and the Bay of Gdansk 11% to the production of juveniles in the Baltic Sea. Furthermore, transport of juveniles surviving to the age of settlement with origin in the Bornholm Basin contributed on average 13 and 11% to the total settlement in the Arkona Basin and in the Gdansk Deep, respectively. The time-series of the simulated occupied juvenile cod habitat in the Bornholm Basin and in the Gdansk Deep showed a similar declining trend as the Fulton's K condition factor of demersal 1-group cod, which may confirm the importance of oxygen-dependent habitat availability and its effect on density dependence as a process relevant for recruitment success.
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 4
    Publication Date: 2020-02-06
    Description: Identification of essential fish habitats (EFH), such as spawning habitats, is important for nature conservation, sustainable fisheries management and marine spatial planning. Two sympatric flounder (Platichthys flesus) ecotypes are present in the Baltic Sea, pelagic and demersal spawning flounder, both displaying ecological and physiological adaptations to the low-salinity environment of this young inland sea. In this study we have addressed three main research questions: 1) What environmental conditions characterize the spatial distribution and abundance of adult flounder during the spawning season? 2) What are the main factors defining the habitats of the two flounder ecotypes during the spawning season? 3) Where are the potential spawning areas of flounder? We modelled catch per unit of effort (CPUE) of flounder from gillnet surveys conducted over the southern and central Baltic Sea in the spring of 2014 and 2015 using generalized additive models. A general model included all the stations fished during the survey while two other models, one for the demersal and one for the pelagic spawning flounder, included only the stations where each flounder ecotype should dominate. The general model captured distinct ecotype-specific signals as it identified dual salinity and water depth responses. The model for the demersal spawning flounder revealed a negative relation with the abundance of round goby (Neogobius melanostomus) and a positive relation with Secchi depth and cod abundance. Vegetation and substrate did not play an important role in the choice of habitat for the demersal ecotype. The model for the pelagic spawning flounder showed a negative relation with temperature and bottom current and a positive relation with salinity. Spatial predictions of potential spawning areas of flounder showed a decrease in habitat availability for the pelagic spawning flounder over the last 20 years in the central part of the Baltic Sea, which may explain part of the observed changes in populations' biomass. We conclude that spatiotemporal modelling of habitat availability can improve our understanding of fish stock dynamics and may provide necessary biological knowledge for the development of marine spatial plans.
    Type: Article , PeerReviewed
    Format: text
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  • 5
    Publication Date: 2022-01-31
    Description: Aim: The interdependencies between trophic interactions, environmental factors and anthropogenic forcing determine how species distributions change over time. Large changes in species distributions have occurred as a result of climate change. The objective of this study was to analyse how the spatial distribution of cod and flounder has changed in the Baltic Sea during the past four decades characterized by large hydrological changes. Location: Baltic Sea. Taxon: Cod (Gadus morhua) and flounder (Platichthys flesus). Methods: Catch per unit of effort (CPUE) data for adult and juvenile cod and for adult flounder were modelled using Delta-Generalized additive models including environmental and geographical variables between 1979 and 2016. From the annual CPUE predictions for each species, yearly distribution maps and depth distribution curves were obtained. Mean depth and the depth range were estimated to provide an indication on preferred depth and habitat occupancy. Results: Adult and juvenile cod showed a contraction in their distribution in the southern areas of the Baltic Sea. Flounder, instead, showed an expansion in its distribution with an increase in abundance in the northern areas. The depth distributions showed a progressive shift of the mean depth of occurrence towards shallower waters for adult cod and flounder and towards deeper waters for juvenile cod, as well as a contraction of the species depth ranges, evident mainly from the late 1980s. Main conclusions: Our study illustrates large changes in the spatial distribution of cod and flounder in the Baltic Sea. The changes in depth distribution occurred from the late 1980s are probably due to a combination of expanded areas of hypoxia in deep waters and an increase in predation risk in shallow waters. The net effect of these changes is an increased spatial overlap between life stages and species, which may amplify cod cannibalism and the interaction strength between cod and flounder
    Type: Article , PeerReviewed
    Format: text
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  • 6
    Publication Date: 2024-05-23
    Repository Name: EPIC Alfred Wegener Institut
    Type: Other , notRev
    Format: application/pdf
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