Do juvenile Atlantic salmon parr track local changes in water velocity?
When given a choice of two flows and constant food availability, salmon parr should choose the lower flow if they are to optimize their net energy gain. In a two-choice test carried out in a recirculating flume, there was no significant selection for ranges of naturally occurring high (mean mid-colu...
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ftsouthampton:oai:eprints.soton.ac.uk:39472 2023-07-30T04:02:26+02:00 Do juvenile Atlantic salmon parr track local changes in water velocity? Kemp, P.S. Gilvear, D.J. Armstrong, J.D. 2003 https://eprints.soton.ac.uk/39472/ unknown Kemp, P.S., Gilvear, D.J. and Armstrong, J.D. (2003) Do juvenile Atlantic salmon parr track local changes in water velocity? River Research and Applications, 19, 569-575. (doi:10.1002/rra.727 <http://dx.doi.org/10.1002/rra.727>). Article PeerReviewed 2003 ftsouthampton 2023-07-09T20:47:56Z When given a choice of two flows and constant food availability, salmon parr should choose the lower flow if they are to optimize their net energy gain. In a two-choice test carried out in a recirculating flume, there was no significant selection for ranges of naturally occurring high (mean mid-column velocities of 19.5-25.2 cm s(-1)) or low (7.2-10.0 cm s(-1)) summer flows. To test whether this result might indicate that only a proportion of the population chose optimal flows, the positions of the flows were reversed. All fish that initially chose low flow remained site-attached when the flows were reversed. A significant proportion of the fish that initially chose high flow moved when the flows were reversed. Hence, there is no evidence that salmon can integrate energy costs and gains to optimize their feeding positions. However, the behaviour of some individual fish was consistent with a 'rule of thumb' of following high flows, which may improve foraging efficiency in natural streams above random in the long but not short term. The findings show that only a fraction of the parr in a population redistribute themselves in response to changes in discharge and therefore a fundamental assumption of some instream flow models is questioned. Article in Journal/Newspaper Atlantic salmon University of Southampton: e-Prints Soton Thumb ENVELOPE(-64.259,-64.259,-65.247,-65.247) |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
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description |
When given a choice of two flows and constant food availability, salmon parr should choose the lower flow if they are to optimize their net energy gain. In a two-choice test carried out in a recirculating flume, there was no significant selection for ranges of naturally occurring high (mean mid-column velocities of 19.5-25.2 cm s(-1)) or low (7.2-10.0 cm s(-1)) summer flows. To test whether this result might indicate that only a proportion of the population chose optimal flows, the positions of the flows were reversed. All fish that initially chose low flow remained site-attached when the flows were reversed. A significant proportion of the fish that initially chose high flow moved when the flows were reversed. Hence, there is no evidence that salmon can integrate energy costs and gains to optimize their feeding positions. However, the behaviour of some individual fish was consistent with a 'rule of thumb' of following high flows, which may improve foraging efficiency in natural streams above random in the long but not short term. The findings show that only a fraction of the parr in a population redistribute themselves in response to changes in discharge and therefore a fundamental assumption of some instream flow models is questioned. |
format |
Article in Journal/Newspaper |
author |
Kemp, P.S. Gilvear, D.J. Armstrong, J.D. |
spellingShingle |
Kemp, P.S. Gilvear, D.J. Armstrong, J.D. Do juvenile Atlantic salmon parr track local changes in water velocity? |
author_facet |
Kemp, P.S. Gilvear, D.J. Armstrong, J.D. |
author_sort |
Kemp, P.S. |
title |
Do juvenile Atlantic salmon parr track local changes in water velocity? |
title_short |
Do juvenile Atlantic salmon parr track local changes in water velocity? |
title_full |
Do juvenile Atlantic salmon parr track local changes in water velocity? |
title_fullStr |
Do juvenile Atlantic salmon parr track local changes in water velocity? |
title_full_unstemmed |
Do juvenile Atlantic salmon parr track local changes in water velocity? |
title_sort |
do juvenile atlantic salmon parr track local changes in water velocity? |
publishDate |
2003 |
url |
https://eprints.soton.ac.uk/39472/ |
long_lat |
ENVELOPE(-64.259,-64.259,-65.247,-65.247) |
geographic |
Thumb |
geographic_facet |
Thumb |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
Kemp, P.S., Gilvear, D.J. and Armstrong, J.D. (2003) Do juvenile Atlantic salmon parr track local changes in water velocity? River Research and Applications, 19, 569-575. (doi:10.1002/rra.727 <http://dx.doi.org/10.1002/rra.727>). |
_version_ |
1772813233061625856 |