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Rudnicki, Karla, 2018. Causes of trends in abundance of mesopredators in the Kattegat Sea. Second cycle, A2E. Uppsala: SLU, Dept. Of Aquatic Resources



It has come to attention that there is a mesopredator release effect present in the Kattegat Sea (northern Europe, between Sweden and Denmark). The areas in focus
here are Ringhals, a nuclear power plant zone, and Vendelsöarna, a undisturbed reference area. Mesopredator abundances like the Carcinus maenas (European Shore Crab) have increased over the years; while there have been a noticeable decreased population of Gadus morhua (Atlantic Cod) and a sea temperature increase since the 1970s.

The aim of this research in the Kattegat Sea is to analyze the potential causes for increasing abundance of mesopredators that could cause cascading effects and alter the ecosystem itself. Since 1976, data has been collected in the Kattegat Sea region where uni- and multivariate analysis, which can examine the idea that there is a correlation between diminished population of the Gadus morhua, (Atlantic Cod) and temperature rise with mesopredator increasing distributions.

Results suggest abundances of mesopredatory fish and crab were highest in areas where there were favourable habitat attributes, eg., in terms of increased temperature. Significant results stating the relationship between increased mesopredator’s abundance and Atlantic Cod deceased abundance. Smaller population of the piscivore Atlantic Cod advocates a cascading process. Adjacent
areas like the Baltic Sea, have and are also experiencing these effects and results can pose particular challenges for the ecosystem.

Main title:Causes of trends in abundance of mesopredators in the Kattegat Sea
Authors:Rudnicki, Karla
Supervisor:Bryhn, Andreas and Jansson, Maria and Piepho, Hans-Peter
Examiner:Östman, Örjan
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2018
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:Other
Supervising department:(NL, NJ) > Dept. Of Aquatic Resources
Keywords:shore crab, atlantic cod, mesopredator, Vendelsöarna, temperature, Ringhals, nuclear power plant
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Aquatic ecology
Deposited On:21 Jan 2019 12:31
Metadata Last Modified:20 May 2020 10:53

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