Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss)
Abstract We observed the behaviour of juvenile steelhead trout (Oncorhynchus mykiss) in two rivers in British Columbia, Canada, to determine the importance of invertebrate drift abundance, intruder pressure, and body size of territory holders as correlates of territory size. Territory size increased...
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crbrillap:10.1163/156853998793066393 2024-09-15T17:56:24+00:00 Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) Keeley McPhail 1998 http://dx.doi.org/10.1163/156853998793066393 https://brill.com/view/journals/beh/135/1/article-p65_5.xml https://brill.com/downloadpdf/journals/beh/135/1/article-p65_5.xml unknown Brill Behaviour volume 135, issue 1, page 65-82 ISSN 0005-7959 1568-539X journal-article 1998 crbrillap https://doi.org/10.1163/156853998793066393 2024-07-01T04:07:59Z Abstract We observed the behaviour of juvenile steelhead trout (Oncorhynchus mykiss) in two rivers in British Columbia, Canada, to determine the importance of invertebrate drift abundance, intruder pressure, and body size of territory holders as correlates of territory size. Territory size increased with increasing fish size, but fish smaller than 5 cm had relatively large territories for their body size, in comparison to fish that were larger than 5 cm in length. After statistically controlling for the effect of body size, territory size was inversely related to the abundance of drifting invertebrates. Territory size was not related to the number of intrusions observed on a territory per hour, but was inversely related to local fish density, a second measure of intruder pressure. Steelhead trout appear to defend territory areas that are most similar in size to juvenile Atlantic salmon. This study provides evidence that stream-dwelling salmonids scale territory size to body size in a manner that allows them to capture a maximum daily ration of food on their territories. Article in Journal/Newspaper Atlantic salmon Brill Behaviour 135 1 65 82 |
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Abstract We observed the behaviour of juvenile steelhead trout (Oncorhynchus mykiss) in two rivers in British Columbia, Canada, to determine the importance of invertebrate drift abundance, intruder pressure, and body size of territory holders as correlates of territory size. Territory size increased with increasing fish size, but fish smaller than 5 cm had relatively large territories for their body size, in comparison to fish that were larger than 5 cm in length. After statistically controlling for the effect of body size, territory size was inversely related to the abundance of drifting invertebrates. Territory size was not related to the number of intrusions observed on a territory per hour, but was inversely related to local fish density, a second measure of intruder pressure. Steelhead trout appear to defend territory areas that are most similar in size to juvenile Atlantic salmon. This study provides evidence that stream-dwelling salmonids scale territory size to body size in a manner that allows them to capture a maximum daily ration of food on their territories. |
format |
Article in Journal/Newspaper |
author |
Keeley McPhail |
spellingShingle |
Keeley McPhail Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
author_facet |
Keeley McPhail |
author_sort |
Keeley |
title |
Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
title_short |
Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
title_full |
Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
title_fullStr |
Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
title_full_unstemmed |
Food Abundance, Intruder Pressure, and Body Size as Determinants of Territory Size in Juvenile Steelhead Trout (Oncorhynchus Mykiss) |
title_sort |
food abundance, intruder pressure, and body size as determinants of territory size in juvenile steelhead trout (oncorhynchus mykiss) |
publisher |
Brill |
publishDate |
1998 |
url |
http://dx.doi.org/10.1163/156853998793066393 https://brill.com/view/journals/beh/135/1/article-p65_5.xml https://brill.com/downloadpdf/journals/beh/135/1/article-p65_5.xml |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Behaviour volume 135, issue 1, page 65-82 ISSN 0005-7959 1568-539X |
op_doi |
https://doi.org/10.1163/156853998793066393 |
container_title |
Behaviour |
container_volume |
135 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
82 |
_version_ |
1810432609151352832 |