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Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem
Temporal differences in habitat use and foraging specialisms between ecomorphs represent aspects of behavioural phenotype that are poorly understood with regard to the origin and maintenance of ecological diversity. We tested the role of behaviour in resource use divergence of two Arctic charr (Salv...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4838883/ https://www.ncbi.nlm.nih.gov/pubmed/27098197 http://dx.doi.org/10.1038/srep24369 |
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author | Hawley, Kate L. Rosten, Carolyn M. Christensen, Guttorm Lucas, Martyn C. |
author_facet | Hawley, Kate L. Rosten, Carolyn M. Christensen, Guttorm Lucas, Martyn C. |
author_sort | Hawley, Kate L. |
collection | PubMed |
description | Temporal differences in habitat use and foraging specialisms between ecomorphs represent aspects of behavioural phenotype that are poorly understood with regard to the origin and maintenance of ecological diversity. We tested the role of behaviour in resource use divergence of two Arctic charr (Salvelinus alpinus) phenotypes, a slim, putatively pelagic-dwelling morph and a robust, putatively littoral-dwelling generalist morph, over an annual cycle, using biotelemetry and stable isotopes. Pelagic morph charr exhibited significantly greater δC(13) depletion, concordant with increased zooplanktivory, than for the Littoral morph. Although three-dimensional space-use of the morphs strongly overlapped, on average, the Littoral morph used that habitat 19.3% more than the Pelagic morph. Pelagic morph fish were significantly more active, further from the lake bed and at greater depth than Littoral fish (annual means respectively, Pelagic, 0.069BLs(−1), 8.21 m and 14.11 m; Littoral, 0.047BLs(−1), 5.87 m and 10.47 m). Patterns of habitat use differed between ecomorphs at key times, such as during autumn and at ice break, likely related to spawning and resumption of intensive foraging respectively. Extensive space-use overlap, but fine-scale differences in habitat use between charr ecomorphs, suggests the importance of competition for generating and maintaining polymorphism, and its potential for promoting reproductive isolation and evolution in sympatry. |
format | Online Article Text |
id | pubmed-4838883 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-48388832016-04-27 Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem Hawley, Kate L. Rosten, Carolyn M. Christensen, Guttorm Lucas, Martyn C. Sci Rep Article Temporal differences in habitat use and foraging specialisms between ecomorphs represent aspects of behavioural phenotype that are poorly understood with regard to the origin and maintenance of ecological diversity. We tested the role of behaviour in resource use divergence of two Arctic charr (Salvelinus alpinus) phenotypes, a slim, putatively pelagic-dwelling morph and a robust, putatively littoral-dwelling generalist morph, over an annual cycle, using biotelemetry and stable isotopes. Pelagic morph charr exhibited significantly greater δC(13) depletion, concordant with increased zooplanktivory, than for the Littoral morph. Although three-dimensional space-use of the morphs strongly overlapped, on average, the Littoral morph used that habitat 19.3% more than the Pelagic morph. Pelagic morph fish were significantly more active, further from the lake bed and at greater depth than Littoral fish (annual means respectively, Pelagic, 0.069BLs(−1), 8.21 m and 14.11 m; Littoral, 0.047BLs(−1), 5.87 m and 10.47 m). Patterns of habitat use differed between ecomorphs at key times, such as during autumn and at ice break, likely related to spawning and resumption of intensive foraging respectively. Extensive space-use overlap, but fine-scale differences in habitat use between charr ecomorphs, suggests the importance of competition for generating and maintaining polymorphism, and its potential for promoting reproductive isolation and evolution in sympatry. Nature Publishing Group 2016-04-21 /pmc/articles/PMC4838883/ /pubmed/27098197 http://dx.doi.org/10.1038/srep24369 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Hawley, Kate L. Rosten, Carolyn M. Christensen, Guttorm Lucas, Martyn C. Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title | Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title_full | Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title_fullStr | Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title_full_unstemmed | Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title_short | Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
title_sort | fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4838883/ https://www.ncbi.nlm.nih.gov/pubmed/27098197 http://dx.doi.org/10.1038/srep24369 |
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