Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators
The survival of Baltic salmon Salmo salar during the first year at sea (post-smolt stage) has declined since the beginning of the 1990s. In this analysis, we complement previous studies on possible causes of this decline by considering a suite of environmental parameters, potential change in predati...
Published in: | ICES Journal of Marine Science |
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Online Access: | https://doi.org/10.1093/icesjms/fsw178 https://www.openagrar.de/receive/openagrar_mods_00034092 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00008473/dn057521.pdf |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00034092 2023-05-15T15:32:50+02:00 Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators Friedland, Kevin D. Dannewitz, J. Romakkaniemi, A. Palm, S. Pulkkinen, H. Pakarinen, T. Oeberst, Rainer 2017 https://doi.org/10.1093/icesjms/fsw178 https://www.openagrar.de/receive/openagrar_mods_00034092 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00008473/dn057521.pdf eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsw178 https://www.openagrar.de/receive/openagrar_mods_00034092 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00008473/dn057521.pdf only signed in user all rights reserved info:eu-repo/semantics/openAccess Text ddc:570 Atlantic salmon Baltic post-smolt survival recruitment temperature article Text 2017 ftopenagrar https://doi.org/10.1093/icesjms/fsw178 2023-03-06T00:12:11Z The survival of Baltic salmon Salmo salar during the first year at sea (post-smolt stage) has declined since the beginning of the 1990s. In this analysis, we complement previous studies on possible causes of this decline by considering a suite of environmental parameters, potential change in predation pressure, and post-smolt growth. Marine survival estimates were found to be negatively correlated with temperature, indicating that warming conditions have not favoured survival. Survival was also found to be positively correlated with dissolved oxygen levels and regionally related to shifts in salinity. These relationships were further studied in context to the potential predation on post-smolts by one of the main piscivores in the Baltic, Eastern Baltic cod (Gadus morhua callarias). Concomitant with changes in environmental conditions, Baltic cod has changed its latitudinal range, moving northward in the Baltic, possibly in response to warming conditions. These changes lead us to hypothesize that predation pressure on salmon may have increased in recent years as cod has now occupied habitats used by salmon post-smolts during their southward feeding migrations. This predation may have been intensified as a result of anoxic conditions in the central basin by concentrating predation interactions in coastal waters and/or the upper water column typically occupied by salmon postsmolts. Indicators of post-smolt growth were applied to test the alternate hypothesis that mortality is growth-mediated; these indicators lacked a time series trend, which supports the contention that shifting predation pressure rather than feeding opportunities is responsible for the decline in post-smolt survival in Baltic salmon. Article in Journal/Newspaper Atlantic salmon Gadus morhua Salmo salar OpenAgrar (OA) ICES Journal of Marine Science 74 5 1344 1355 |
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OpenAgrar (OA) |
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ftopenagrar |
language |
English |
topic |
Text ddc:570 Atlantic salmon Baltic post-smolt survival recruitment temperature |
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Text ddc:570 Atlantic salmon Baltic post-smolt survival recruitment temperature Friedland, Kevin D. Dannewitz, J. Romakkaniemi, A. Palm, S. Pulkkinen, H. Pakarinen, T. Oeberst, Rainer Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
topic_facet |
Text ddc:570 Atlantic salmon Baltic post-smolt survival recruitment temperature |
description |
The survival of Baltic salmon Salmo salar during the first year at sea (post-smolt stage) has declined since the beginning of the 1990s. In this analysis, we complement previous studies on possible causes of this decline by considering a suite of environmental parameters, potential change in predation pressure, and post-smolt growth. Marine survival estimates were found to be negatively correlated with temperature, indicating that warming conditions have not favoured survival. Survival was also found to be positively correlated with dissolved oxygen levels and regionally related to shifts in salinity. These relationships were further studied in context to the potential predation on post-smolts by one of the main piscivores in the Baltic, Eastern Baltic cod (Gadus morhua callarias). Concomitant with changes in environmental conditions, Baltic cod has changed its latitudinal range, moving northward in the Baltic, possibly in response to warming conditions. These changes lead us to hypothesize that predation pressure on salmon may have increased in recent years as cod has now occupied habitats used by salmon post-smolts during their southward feeding migrations. This predation may have been intensified as a result of anoxic conditions in the central basin by concentrating predation interactions in coastal waters and/or the upper water column typically occupied by salmon postsmolts. Indicators of post-smolt growth were applied to test the alternate hypothesis that mortality is growth-mediated; these indicators lacked a time series trend, which supports the contention that shifting predation pressure rather than feeding opportunities is responsible for the decline in post-smolt survival in Baltic salmon. |
format |
Article in Journal/Newspaper |
author |
Friedland, Kevin D. Dannewitz, J. Romakkaniemi, A. Palm, S. Pulkkinen, H. Pakarinen, T. Oeberst, Rainer |
author_facet |
Friedland, Kevin D. Dannewitz, J. Romakkaniemi, A. Palm, S. Pulkkinen, H. Pakarinen, T. Oeberst, Rainer |
author_sort |
Friedland, Kevin D. |
title |
Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
title_short |
Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
title_full |
Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
title_fullStr |
Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
title_full_unstemmed |
Post-smolt survival of Baltic salmon in context to changing environmental conditions and predators |
title_sort |
post-smolt survival of baltic salmon in context to changing environmental conditions and predators |
publishDate |
2017 |
url |
https://doi.org/10.1093/icesjms/fsw178 https://www.openagrar.de/receive/openagrar_mods_00034092 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00008473/dn057521.pdf |
genre |
Atlantic salmon Gadus morhua Salmo salar |
genre_facet |
Atlantic salmon Gadus morhua Salmo salar |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsw178 https://www.openagrar.de/receive/openagrar_mods_00034092 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00008473/dn057521.pdf |
op_rights |
only signed in user all rights reserved info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsw178 |
container_title |
ICES Journal of Marine Science |
container_volume |
74 |
container_issue |
5 |
container_start_page |
1344 |
op_container_end_page |
1355 |
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1766363322939080704 |