Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar )
Abstract – Decreases in body growth with increasing population density may be caused by reduced prey delivery rate. However, changes in food quality because of an increasing inclusion of suboptimal prey in the diet may also contribute to such effects. Here, we test for density‐dependent diet composi...
Published in: | Ecology of Freshwater Fish |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2010
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1600-0633.2010.00468.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0633.2010.00468.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0633.2010.00468.x |
id |
crwiley:10.1111/j.1600-0633.2010.00468.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1600-0633.2010.00468.x 2024-04-14T08:09:08+00:00 Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) Martinussen, Pål A. Robertsen, Grethe Einum, Sigurd 2010 http://dx.doi.org/10.1111/j.1600-0633.2010.00468.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0633.2010.00468.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0633.2010.00468.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 20, issue 3, page 384-392 ISSN 0906-6691 1600-0633 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2010 crwiley https://doi.org/10.1111/j.1600-0633.2010.00468.x 2024-03-19T11:00:21Z Abstract – Decreases in body growth with increasing population density may be caused by reduced prey delivery rate. However, changes in food quality because of an increasing inclusion of suboptimal prey in the diet may also contribute to such effects. Here, we test for density‐dependent diet composition by creating spatial variation in Atlantic salmon young‐of‐the‐year (YOY) density in three replicate streams and obtain detailed information on individual positions (±1 m) and diet. Diet breadth with respect to prey size increased with increasing local density for the two most common prey types (Chironomidae and Ephemeroptera). For the largest prey type (Ephemeroptera), there was also an increase in mean prey size with increasing density, suggesting that YOY salmon preferentially utilise the smaller prey among those available. According to optimal foraging theory, changes in diet with increasing local density are likely to come at an energetic cost and hence may contribute to the commonly observed density‐dependent growth of juvenile salmonids. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Ecology of Freshwater Fish 20 3 384 392 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Martinussen, Pål A. Robertsen, Grethe Einum, Sigurd Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract – Decreases in body growth with increasing population density may be caused by reduced prey delivery rate. However, changes in food quality because of an increasing inclusion of suboptimal prey in the diet may also contribute to such effects. Here, we test for density‐dependent diet composition by creating spatial variation in Atlantic salmon young‐of‐the‐year (YOY) density in three replicate streams and obtain detailed information on individual positions (±1 m) and diet. Diet breadth with respect to prey size increased with increasing local density for the two most common prey types (Chironomidae and Ephemeroptera). For the largest prey type (Ephemeroptera), there was also an increase in mean prey size with increasing density, suggesting that YOY salmon preferentially utilise the smaller prey among those available. According to optimal foraging theory, changes in diet with increasing local density are likely to come at an energetic cost and hence may contribute to the commonly observed density‐dependent growth of juvenile salmonids. |
format |
Article in Journal/Newspaper |
author |
Martinussen, Pål A. Robertsen, Grethe Einum, Sigurd |
author_facet |
Martinussen, Pål A. Robertsen, Grethe Einum, Sigurd |
author_sort |
Martinussen, Pål A. |
title |
Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
title_short |
Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
title_full |
Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
title_fullStr |
Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
title_full_unstemmed |
Density‐dependent diet composition of juvenile Atlantic salmon ( Salmo salar ) |
title_sort |
density‐dependent diet composition of juvenile atlantic salmon ( salmo salar ) |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1600-0633.2010.00468.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0633.2010.00468.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0633.2010.00468.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ecology of Freshwater Fish volume 20, issue 3, page 384-392 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1600-0633.2010.00468.x |
container_title |
Ecology of Freshwater Fish |
container_volume |
20 |
container_issue |
3 |
container_start_page |
384 |
op_container_end_page |
392 |
_version_ |
1796306588172025856 |