Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts
<qd> Mäntyniemi, S., Romakkaniemi, A., Dannewitz, J., Palm, S., Pakarinen, T., Pulkkinen, H., Gårdmark, A., and Karlsson, O. Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts. – ICES Journal of Marine Science, doi:10.1093/icesjms/fss088. <...
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Oxford University Press
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fthighwire:oai:open-archive.highwire.org:icesjms:fss088v1 2023-05-15T18:09:56+02:00 Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts Mäntyniemi, Samu Romakkaniemi, Atso Dannewitz, Johan Palm, Stefan Pakarinen, Tapani Pulkkinen, Henni Gårdmark, Anna Karlsson, Olle 2012-05-15 03:01:31.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fss088v1 https://doi.org/10.1093/icesjms/fss088 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fss088v1 http://dx.doi.org/10.1093/icesjms/fss088 Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Salmon at Sea TEXT 2012 fthighwire https://doi.org/10.1093/icesjms/fss088 2013-05-26T22:47:31Z <qd> Mäntyniemi, S., Romakkaniemi, A., Dannewitz, J., Palm, S., Pakarinen, T., Pulkkinen, H., Gårdmark, A., and Karlsson, O. Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts. – ICES Journal of Marine Science, doi:10.1093/icesjms/fss088. </qd>The survival of wild and hatchery-reared post-smolts of salmon ( Salmo salar ) in the Baltic Sea has declined since the 1990s. Direct observations of the processes affecting survival are, however, lacking. Here, the importance of food availability and predation in regulating post-smolt survival is analysed. Based on previous studies, the following explanatory variables were selected: (i) availability of herring ( Clupea harengus membras ) recruits in the Gulf of Bothnia (Bothnian Sea, Bothnian Bay) in the northern Baltic Sea; (ii) sprat ( Sprattus sprattus balticus ) and herring abundance in the southern Baltic Sea; and (iii) abundance of grey seal ( Halichoerus grypus ) along the post-smolt migration route. Bayesian analysis was used to estimate the relative probability of each of the 32 combinations of these variables and revealed that the model including grey seal abundance and herring recruits per post-smolt had the highest posterior probability and a high coefficient of determination. The results suggest that the declining trend in post-smolt survival is explained by the increased number of grey seals, whereas the annual variation in survival coincides with variation in the recruitment of Bothnian Sea herring. However, it remains uncertain whether the observed correlations arise from direct causalities or other mechanisms. Text Salmo salar HighWire Press (Stanford University) Mäntyniemi ENVELOPE(25.624,25.624,66.469,66.469) Romakkaniemi ENVELOPE(24.667,24.667,66.700,66.700) ICES Journal of Marine Science 69 9 1574 1579 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Salmon at Sea |
spellingShingle |
Salmon at Sea Mäntyniemi, Samu Romakkaniemi, Atso Dannewitz, Johan Palm, Stefan Pakarinen, Tapani Pulkkinen, Henni Gårdmark, Anna Karlsson, Olle Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
topic_facet |
Salmon at Sea |
description |
<qd> Mäntyniemi, S., Romakkaniemi, A., Dannewitz, J., Palm, S., Pakarinen, T., Pulkkinen, H., Gårdmark, A., and Karlsson, O. Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts. – ICES Journal of Marine Science, doi:10.1093/icesjms/fss088. </qd>The survival of wild and hatchery-reared post-smolts of salmon ( Salmo salar ) in the Baltic Sea has declined since the 1990s. Direct observations of the processes affecting survival are, however, lacking. Here, the importance of food availability and predation in regulating post-smolt survival is analysed. Based on previous studies, the following explanatory variables were selected: (i) availability of herring ( Clupea harengus membras ) recruits in the Gulf of Bothnia (Bothnian Sea, Bothnian Bay) in the northern Baltic Sea; (ii) sprat ( Sprattus sprattus balticus ) and herring abundance in the southern Baltic Sea; and (iii) abundance of grey seal ( Halichoerus grypus ) along the post-smolt migration route. Bayesian analysis was used to estimate the relative probability of each of the 32 combinations of these variables and revealed that the model including grey seal abundance and herring recruits per post-smolt had the highest posterior probability and a high coefficient of determination. The results suggest that the declining trend in post-smolt survival is explained by the increased number of grey seals, whereas the annual variation in survival coincides with variation in the recruitment of Bothnian Sea herring. However, it remains uncertain whether the observed correlations arise from direct causalities or other mechanisms. |
format |
Text |
author |
Mäntyniemi, Samu Romakkaniemi, Atso Dannewitz, Johan Palm, Stefan Pakarinen, Tapani Pulkkinen, Henni Gårdmark, Anna Karlsson, Olle |
author_facet |
Mäntyniemi, Samu Romakkaniemi, Atso Dannewitz, Johan Palm, Stefan Pakarinen, Tapani Pulkkinen, Henni Gårdmark, Anna Karlsson, Olle |
author_sort |
Mäntyniemi, Samu |
title |
Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
title_short |
Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
title_full |
Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
title_fullStr |
Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
title_full_unstemmed |
Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts |
title_sort |
both predation and feeding opportunities may explain changes in survival of baltic salmon post-smolts |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fss088v1 https://doi.org/10.1093/icesjms/fss088 |
long_lat |
ENVELOPE(25.624,25.624,66.469,66.469) ENVELOPE(24.667,24.667,66.700,66.700) |
geographic |
Mäntyniemi Romakkaniemi |
geographic_facet |
Mäntyniemi Romakkaniemi |
genre |
Salmo salar |
genre_facet |
Salmo salar |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fss088v1 http://dx.doi.org/10.1093/icesjms/fss088 |
op_rights |
Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fss088 |
container_title |
ICES Journal of Marine Science |
container_volume |
69 |
container_issue |
9 |
container_start_page |
1574 |
op_container_end_page |
1579 |
_version_ |
1766182627522379776 |