Life in the ice lane: the winter ecology of stream salmonids
Identifieur interne : 000769 ( Main/Exploration ); précédent : 000768; suivant : 000770Life in the ice lane: the winter ecology of stream salmonids
Auteurs : Ari Huusko [Finlande] ; Larry Greenberg [Suède] ; Morten Stickler [Norvège] ; Tommi Linnansaari [Canada] ; Mari Nyk Nen [Finlande] ; Teppo Vehanen [Finlande] ; Saija Koljonen [Finlande] ; Pauliina Louhi [Finlande] ; Knut Alfredsen [Norvège]Source :
- River Research and Applications [ 1535-1459 ] ; 2007-06.
English descriptors
Abstract
Despite the common view that conditions in winter strongly influence survival and population size of fish, the ecology of salmonids has not been as extensively studied in winter as in other seasons. In this paper, we review the latest studies on salmonid winter survival, habitat use, movement and biotic interactions as they relate to the prevailing physical and habitat conditions in rivers and streams. The majority of research conducted on the winter ecology of salmonids has been carried out in small rivers and streams, where temperatures are above zero and where there is no ice. Investigations in large rivers, regulated and dredged rivers, and under conditions of different ice formations are almost totally lacking, presumably related to sampling difficulties with these systems. The studies‐at‐hand indicate that a multitude of physical and biological factors affect the survival, behavior, and habitat use of salmonids in winter. The general concept that winter functions as a critical period for the survival of young salmonids is not well supported by the literature. Instead, overwinter survival of juvenile fish appears to be context‐dependent, related to specific habitat characteristics and ice regimes of streams. In general, over wintering salmonids prefer sheltered, low velocity microhabitats, are mainly nocturnal, and interact relatively little with conspecifics or interspecifics. Specific descriptions of microhabitat preferences of salmonids are difficult to make due to highly disparate results from the literature. We suggest that future research should be directed towards (1) being able to predict the dynamics of freezing and ice processes at different scales, especially at the local scale, (2) studying fish behavior, habitat use and preference under partial and full ice cover, (3) evaluating the impacts of man‐induced environmental modifications (e. g. flow regulation, land‐use activities) on the ecology of salmonids in winter, and (4) identifying methods to model and assess winter habitat conditions for salmonids. Copyright © 2007 John Wiley & Sons, Ltd.
Url:
DOI: 10.1002/rra.999
Affiliations:
- Canada, Finlande, Norvège, Suède
- Finlande-Centrale, Trøndelag
- Jyväskylä, Trondheim
- Université de Jyväskylä
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Instead, overwinter survival of juvenile fish appears to be context‐dependent, related to specific habitat characteristics and ice regimes of streams. In general, over wintering salmonids prefer sheltered, low velocity microhabitats, are mainly nocturnal, and interact relatively little with conspecifics or interspecifics. Specific descriptions of microhabitat preferences of salmonids are difficult to make due to highly disparate results from the literature. We suggest that future research should be directed towards (1) being able to predict the dynamics of freezing and ice processes at different scales, especially at the local scale, (2) studying fish behavior, habitat use and preference under partial and full ice cover, (3) evaluating the impacts of man‐induced environmental modifications (e. g. flow regulation, land‐use activities) on the ecology of salmonids in winter, and (4) identifying methods to model and assess winter habitat conditions for salmonids. Copyright © 2007 John Wiley & Sons, Ltd.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Finlande</li><li>Norvège</li><li>Suède</li></country><region><li>Finlande-Centrale</li><li>Trøndelag</li></region><settlement><li>Jyväskylä</li><li>Trondheim</li></settlement><orgName><li>Université de Jyväskylä</li></orgName></list><tree><country name="Finlande"><noRegion><name sortKey="Huusko, Ari" sort="Huusko, Ari" uniqKey="Huusko A" first="Ari" last="Huusko">Ari Huusko</name></noRegion><name sortKey="Koljonen, Saija" sort="Koljonen, Saija" uniqKey="Koljonen S" first="Saija" last="Koljonen">Saija Koljonen</name><name sortKey="Louhi, Pauliina" sort="Louhi, Pauliina" uniqKey="Louhi P" first="Pauliina" last="Louhi">Pauliina Louhi</name><name sortKey="Nyk Nen, Mari" sort="Nyk Nen, Mari" uniqKey="Nyk Nen M" first="Mari" last="Nyk Nen">Mari Nyk Nen</name><name sortKey="Vehanen, Teppo" sort="Vehanen, Teppo" uniqKey="Vehanen T" first="Teppo" last="Vehanen">Teppo Vehanen</name></country><country name="Suède"><noRegion><name sortKey="Greenberg, Larry" sort="Greenberg, Larry" uniqKey="Greenberg L" first="Larry" last="Greenberg">Larry Greenberg</name></noRegion></country><country name="Norvège"><region name="Trøndelag"><name sortKey="Stickler, Morten" sort="Stickler, Morten" uniqKey="Stickler M" first="Morten" last="Stickler">Morten Stickler</name></region><name sortKey="Alfredsen, Knut" sort="Alfredsen, Knut" uniqKey="Alfredsen K" first="Knut" last="Alfredsen">Knut Alfredsen</name></country><country name="Canada"><noRegion><name sortKey="Linnansaari, Tommi" sort="Linnansaari, Tommi" uniqKey="Linnansaari T" first="Tommi" last="Linnansaari">Tommi Linnansaari</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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