Stream habitat use and diet of juvenile (0+) brown trout and grayling in sympatry
Identifieur interne : 000C63 ( Main/Exploration ); précédent : 000C62; suivant : 000C64Stream habitat use and diet of juvenile (0+) brown trout and grayling in sympatry
Auteurs : E. Degerman [Suède] ; I. N Slund [Suède] ; B. Sers [Suède]Source :
- Ecology of Freshwater Fish [ 0906-6691 ] ; 2000-12.
English descriptors
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Abstract
Abstract – Electrofishing survey data and experiments carried out in a semi‐natural stream were used to test the hypothesis that interactions between underyearling (0+) trout and grayling during their first summer affect habitat use and diet. The survey data revealed a general difference in habitat use, with 0+ grayling being more common than 0+ trout in large streams and deeper sections. It was also found that in the presence of trout, finer substrate and shallower sections were utilised more by grayling. Field experiments were carried out with three treatments; trout alone, grayling alone and the two species together. In both the July and September experiments grayling tended to occupy deeper sections than trout. Trout abundance was higher in shallow areas in sympatry, while no such difference was found in allopatry. The rate of disappearance of grayling from the study sections was significantly higher in sympatry in July, while no difference was found in September. In July the size difference between species and the degree of dietary overlap were small and non‐significant, respectively, indicating that the two species were strongly competing.Note
Url:
DOI: 10.1111/j.1600-0633.2000.eff090401.x
Affiliations:
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The survey data revealed a general difference in habitat use, with 0+ grayling being more common than 0+ trout in large streams and deeper sections. It was also found that in the presence of trout, finer substrate and shallower sections were utilised more by grayling. Field experiments were carried out with three treatments; trout alone, grayling alone and the two species together. In both the July and September experiments grayling tended to occupy deeper sections than trout. Trout abundance was higher in shallow areas in sympatry, while no such difference was found in allopatry. The rate of disappearance of grayling from the study sections was significantly higher in sympatry in July, while no difference was found in September. In July the size difference between species and the degree of dietary overlap were small and non‐significant, respectively, indicating that the two species were strongly competing.Note</div></front></TEI><affiliations><list><country><li>Suède</li></country></list><tree><country name="Suède"><noRegion><name sortKey="Degerman, E" sort="Degerman, E" uniqKey="Degerman E" first="E." last="Degerman">E. Degerman</name></noRegion><name sortKey="N Slund, I" sort="N Slund, I" uniqKey="N Slund I" first="I." last="N Slund">I. N Slund</name><name sortKey="Sers, B" sort="Sers, B" uniqKey="Sers B" first="B." last="Sers">B. Sers</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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