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Predation på evertebrater under tidig vår i sjön Tåkern
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology.
2012 (Swedish)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
Abstract [en]

Benthic invertebrates play important roles as feeding resources for many organisms in different food webs. Shifts in predation of these organisms can generate cascading effects and potentially lead to the disappearance of one or more species from a site. Cascading effects can bring impacts to organisms who aren’t even directly involved, why studies in this field are important for understanding sudden changes in ecosystems. I examined the predation from fish and waterfowl on benthic invertebrates in the shallow and eutrophic Lake Tåkern in the plains of Östergötland County, southern Sweden. The study was experimental and used exclosures (three types, eight replicates) in the shape of 130-liter cages to examine the composition of invertebrates. It was conducted during early spring, a relatively unexamined period for this kind of study. I found no significant differences in the control treatment compared to any of the other treatments regarding biodiversity. The invertebrate fauna was dominated by a small number of species, with a relatively patchy spread throughout the sediment area. Furthermore, the results indicate that the fish hadn’t had the time to properly activate their predatory habits due to prolonged winter temperatures. The waterfowl were considered too absent during the test period to affect the invertebrate community. Future studies in this area are recommended to work with a greater sampling area, to reduce the influence of extreme values.

Place, publisher, year, edition, pages
2012. , 13 p.
Keyword [en]
Predation, Predator-prey interactions, Benthic invertebrates, Exclosures, Tåkern, Benthivorous fish, Waterfowl
National Category
URN: urn:nbn:se:liu:diva-79044ISRN: LiTH-IFM-EX-G-12/2666--SEOAI: diva2:537959
Subject / course
Life Earth Science
Available from: 2012-06-28 Created: 2012-06-28 Last updated: 2012-06-28Bibliographically approved

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