Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden
In this study I use a 56 years long dataset to study the migratory behaviours of a land-locked population of Brown trout (Salmo trutta) in the river Dammån, positioned in central Sweden. I found that there was a mean female-to-male sex ratio in the spawning-run of approximately 2.31 with an average...
| Autor principal: | |
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| Formato: | Second cycle, A2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2018
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| Acceso en línea: | https://stud.epsilon.slu.se/13906/ |
| _version_ | 1855572321481261056 |
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| author | Vigren, Carl |
| author_browse | Vigren, Carl |
| author_facet | Vigren, Carl |
| author_sort | Vigren, Carl |
| collection | Epsilon Archive for Student Projects |
| description | In this study I use a 56 years long dataset to study the migratory behaviours of a land-locked population of Brown trout (Salmo trutta) in the river Dammån, positioned in central Sweden. I found that there was a mean female-to-male sex ratio in the spawning-run of approximately 2.31 with an average 50% run date on the 29th of July.
I principally investigated if there were any trends in 3 different temporal scales: diel, seasonal and interannual. The model investigating diel effect was not significant, likely due to the light summer nights at this latitude. I found that there was a seasonal trend, where the probability of an observation being female increased by 54.33% during the season, indicative of a protandric trait where males gain from an early arrival to the spawning-grounds. The interannual model displayed a decline of 13.85% in the proportion of females migrating over the 56 years investigated. |
| format | Second cycle, A2E |
| id | RepoSLU13906 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2018 |
| publishDateSort | 2018 |
| record_format | eprints |
| spelling | RepoSLU139062019-02-28T08:15:25Z https://stud.epsilon.slu.se/13906/ Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden Vigren, Carl Aquatic ecology In this study I use a 56 years long dataset to study the migratory behaviours of a land-locked population of Brown trout (Salmo trutta) in the river Dammån, positioned in central Sweden. I found that there was a mean female-to-male sex ratio in the spawning-run of approximately 2.31 with an average 50% run date on the 29th of July. I principally investigated if there were any trends in 3 different temporal scales: diel, seasonal and interannual. The model investigating diel effect was not significant, likely due to the light summer nights at this latitude. I found that there was a seasonal trend, where the probability of an observation being female increased by 54.33% during the season, indicative of a protandric trait where males gain from an early arrival to the spawning-grounds. The interannual model displayed a decline of 13.85% in the proportion of females migrating over the 56 years investigated. 2018-10-31 Second cycle, A2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/13906/1/vigren_c_181031.pdf Vigren, Carl, 2018. Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden : a study at three temporal scales. Second cycle, A2E. Umeå: (S) > Dept. of Wildlife, Fish and Environmental Studies <https://stud.epsilon.slu.se/view/divisions/OID-251.html> urn:nbn:se:slu:epsilon-s-9918 eng |
| spellingShingle | Aquatic ecology Vigren, Carl Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title | Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title_full | Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title_fullStr | Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title_full_unstemmed | Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title_short | Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden |
| title_sort | sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (salmo trutta) in central sweden |
| topic | Aquatic ecology |
| url | https://stud.epsilon.slu.se/13906/ https://stud.epsilon.slu.se/13906/ |