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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: SLU, Dept. of Wildlife, Fish and Environmental Studies

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Abstract

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.

Main title:Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden
Subtitle:a study at three temporal scales
Authors:Vigren, Carl
Supervisor:Hellström, Gustav and Leonardsson, Kjell
Examiner:Alanärä, Anders
Series:Examensarbete / SLU, Institutionen för vilt, fisk och miljö
Volume/Sequential designation:2018:17
Year of Publication:2018
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SY001 Forest Science - Master's Programme 300 HEC
Supervising department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Keywords:trout, salmonid, salmo, trutta, migration, upstream, Storsjon, Storsjön, Damman, Dammån, regulated, fish ladder, behaviour, protandry
URN:NBN:urn:nbn:se:slu:epsilon-s-9918
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-9918
Subjects:Aquatic ecology
Language:English
Deposited On:08 Nov 2018 14:24
Metadata Last Modified:28 Feb 2019 08:15

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