The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry
We conducted semi-natural experiments to measure the relative contribution of various environmental factors and intraspecific and interspecific competition with an exotic invader on the daytime and crepuscular activity levels of Atlantic salmon ( Salmo salar ) fry. We demonstrated that interspecific...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2008
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f08-079 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-079 |
id |
crcansciencepubl:10.1139/f08-079 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f08-079 2024-05-19T07:37:15+00:00 The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry Blanchet, Simon Loot, Géraldine Bernatchez, Louis Dodson, Julian J. 2008 http://dx.doi.org/10.1139/f08-079 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-079 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 8, page 1545-1553 ISSN 0706-652X 1205-7533 journal-article 2008 crcansciencepubl https://doi.org/10.1139/f08-079 2024-05-02T06:51:27Z We conducted semi-natural experiments to measure the relative contribution of various environmental factors and intraspecific and interspecific competition with an exotic invader on the daytime and crepuscular activity levels of Atlantic salmon ( Salmo salar ) fry. We demonstrated that interspecific competition with the exotic rainbow trout ( Oncorhynchus mykiss ) significantly increases the daytime activity of Atlantic salmon. The effect of intraspecific competition on the daytime activity of salmon was half that of interspecific competition. This indicates that the effect of rainbow trout was a combination of increasing density and the identity of the competitor. We also demonstrated that the effect of rainbow trout was probably the result of territorial interference between species. Moreover, we showed that water temperature simultaneously played an important role in explaining daytime activity of Atlantic salmon. During twilight, we observed no effect of competition on salmon activity, but environmental cues other than temperature (e.g., invertebrate drift, cloud cover) became significant predictors of activity. Feeding and growth rates of Atlantic salmon were not affected by the different levels of competition. Nevertheless, the exotic species may have a major impact by exposing the native species to increased risks of daytime predation. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 65 8 1545 1553 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
We conducted semi-natural experiments to measure the relative contribution of various environmental factors and intraspecific and interspecific competition with an exotic invader on the daytime and crepuscular activity levels of Atlantic salmon ( Salmo salar ) fry. We demonstrated that interspecific competition with the exotic rainbow trout ( Oncorhynchus mykiss ) significantly increases the daytime activity of Atlantic salmon. The effect of intraspecific competition on the daytime activity of salmon was half that of interspecific competition. This indicates that the effect of rainbow trout was a combination of increasing density and the identity of the competitor. We also demonstrated that the effect of rainbow trout was probably the result of territorial interference between species. Moreover, we showed that water temperature simultaneously played an important role in explaining daytime activity of Atlantic salmon. During twilight, we observed no effect of competition on salmon activity, but environmental cues other than temperature (e.g., invertebrate drift, cloud cover) became significant predictors of activity. Feeding and growth rates of Atlantic salmon were not affected by the different levels of competition. Nevertheless, the exotic species may have a major impact by exposing the native species to increased risks of daytime predation. |
format |
Article in Journal/Newspaper |
author |
Blanchet, Simon Loot, Géraldine Bernatchez, Louis Dodson, Julian J. |
spellingShingle |
Blanchet, Simon Loot, Géraldine Bernatchez, Louis Dodson, Julian J. The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
author_facet |
Blanchet, Simon Loot, Géraldine Bernatchez, Louis Dodson, Julian J. |
author_sort |
Blanchet, Simon |
title |
The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
title_short |
The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
title_full |
The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
title_fullStr |
The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
title_full_unstemmed |
The effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of Atlantic salmon (Salmo salar) fry |
title_sort |
effects of abiotic factors and intraspecific versus interspecific competition on the diel activity patterns of atlantic salmon (salmo salar) fry |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/f08-079 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-079 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 8, page 1545-1553 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f08-079 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
65 |
container_issue |
8 |
container_start_page |
1545 |
op_container_end_page |
1553 |
_version_ |
1799476503217438720 |