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The temperature dependence of predator/prey interactions: A comparative study of temperature and swimming velocities of Brown Trout (Salmo trutta) and Northern Pike (Esox lucius)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The attack rate of Northern Pike (Esox lucius) on brown trout (Salmo trutta) was found to decrease with temperature in an earlier study by Gunnar Öhlund. The hypothesis that the low attack rate in cold water was due to a decrease in swimming velocities of pikes was tested by measuring velocities from video recordings made in the attack rate study. A complementary scare experiment meant to measure the physiological maximum swimming capacity for both Brown Trout and Northern Pike was conducted to further evaluate the temperature dependence of swimming velocities. The swimming velocities in the encounter experiment did indeed decrease with decreasing temperature, but the scare experiment showed that the high swimming speeds was possible over the entire temperature range. This suggests that the low swimming velocities observed at low temperatures in the encounter experiment were due to choice or lack of motivation.

Place, publisher, year, edition, pages
2011. , 12 p.
National Category
URN: urn:nbn:se:umu:diva-61532OAI: diva2:570441
Educational program
Bachelor of Science in Biology and Earthscience
Life Earth Science
Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-19Bibliographically approved

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Norman, Sven
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Department of Ecology and Environmental Sciences

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