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Leander, Johan, 2015. Evaluating lake charr (Salvelinus namaycush) temperature use in a mountain lake using acoustic telemetry. Second cycle, A2E. Umeå: SLU, Dept. of Wildlife, Fish and Environmental Studies



Bathythermal distribution of lake charr (Salvelinus namaycush) was surveyed in a boreal lake located in northern Sweden. Based on acoustic telemetry, a high resolution dataset was acquired with more than 630 000 observations from eighteen tagged lake charr. The study was conducted during 2013 and 2014 and covered spring, summer and autumn with their contrasting thermal conditions. I found that temperature was a limiting factor for lake charr habitat selection. When given the possibility to choose temperature, i.e. during the thermally stratified summer, they had a preferendum around 8.2°C stretching from 7.5°C to 10.5°C and less than 2% of all detections exceeding 12ºC. Activity of lake charr were, however, at a minimum at these temperatures and instead at maximum levels at depths corresponding to less than 7 and more than 12. Given that activity is correlated to search for prey, this suggest a trade-off between preferred temperatures vs. prey availability.

Main title:Evaluating lake charr (Salvelinus namaycush) temperature use in a mountain lake using acoustic telemetry
Authors:Leander, Johan
Supervisor:Hellström, Gustav and Lundqvist, Hans
Examiner:Magnhagen, Carin
Series:Examensarbete i ämnet biologi / Sveriges lantbruksuniversitet, Institutionen för vilt, fisk och miljö
Volume/Sequential designation:2015:12
Year of Publication:2015
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:None
Supervising department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Keywords:lake charr, acoustic telemetry, habitat selection, temperature
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Subject. Use of subject categories until 2023-04-30.:Life sciences
Deposited On:21 Aug 2015 11:58
Metadata Last Modified:21 Aug 2015 11:58

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