Suraci, Flavia, 2025. How does Eurasian minnow affect the diet of brown trout in streams in northern Sweden?. Second cycle, A2E. Umeå: SLU, Dept. of Wildlife, Fish and Environmental Studies
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Abstract
Brown trout and Eurasian minnow can compete for the same resources, but they may also predate on each other. Minnows are spreading in the Swedish mountain region and their introduction can lead to salmonid extinction. These two species have been studied mainly in lakes and this study aims to achieve a better understanding of their interaction in streams.
Eight streams in the Abisko area were investigated, where brown trout was found in seven out of 13 stretches, and in three of these, the trout were living in sympatry with minnows. We found intermediate/high diet overlap within the sympatric stretches but also between trout that live in allopatry and in sympatry with minnows. No specialization either on prey type or size was observed in sympatric trout compared to allopatric ones. We observed a trend towards lower trout densities when minnow was present. We did not find signs of predation on fish in any of the samples analysed.
Our results give a better insight about the interaction of the two species in steams fundamental for future investigations.
| Main title: | How does Eurasian minnow affect the diet of brown trout in streams in northern Sweden? |
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| Authors: | Suraci, Flavia |
| Supervisor: | Nilsson, Karin and Van Dorst, Renee and Öhlund, Gunnar |
| Examiner: | Mc Callum, Erin |
| Series: | Examensarbete / SLU, Institutionen för vilt, fisk och miljö |
| Volume/Sequential designation: | 2025:15 |
| Year of Publication: | 2025 |
| Level and depth descriptor: | Second cycle, A2E |
| Student's programme affiliation: | None |
| Supervising department: | (S) > Dept. of Wildlife, Fish and Environmental Studies |
| Keywords: | diet overlap, competition, streams |
| URN:NBN: | urn:nbn:se:slu:epsilon-s-21702 |
| Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-21702 |
| Language: | English |
| Deposited On: | 17 Sep 2025 11:37 |
| Metadata Last Modified: | 17 Sep 2025 11:37 |
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