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Trophic interaction...
Trophic interactions and behaviour : Studies relevant to a Baltic Sea biomanipulation
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- Holliland, Per B., 1984- (author)
- Stockholms universitet,Systemekologiska institutionen
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- Hansson, Sture, Professor (thesis advisor)
- Stockholms universitet,Systemekologiska institutionen
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- Gorokhova, Elena, Professor (thesis advisor)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)
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- Tiselius, Peter, Professor (opponent)
- Göteborgs universitet, Institutionen för biologi och miljövetenskap
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(creator_code:org_t)
- ISBN 9789174475678
- Stockholm : Department of Systems Ecology, Stockholm University, 2012
- English 31 s.
- Related links:
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https://su.diva-port... (primary) (Raw object)
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Abstract
Subject headings
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- The main theme of this thesis is the interactions of animals with the environment and each other. The thesis was written within the framework of a biomanipulation project “Pikeperch in Himmerfjärden”. With the aim to investigate possible trophic pit-falls, give the manipulation the best possible start, and find ways to monitor the progression of the manipulation. In Paper I the diet of the invader cladoceran Cercopagis pengoi is analysed with stable isotopes; conducted prior to stocking. C.pengoi has a preference for large copepods, indicating possible competition with fish. Paper II investigates the behavioural differences between pikeperch fingerlings reared in different environments (pond vs. tank). Results suggest that fish reared in semi-natural ponds are more likely to survive directly after stocking. In Paper III and IV, the diel vertical migrations (DVM) of copepods are in focus. In Paper III the migrations of two copepod species: Acartia spp. and Eurytemora affinis are studied over season and life stage. The amplitude of migration was found to increase with ontogeny for both species, indicating evasion of visual predators. Paper IV examines the varying migratory patterns of adult female E. affinis finding that these animals migrate more actively when feeding conditions deteriorate and growth decreases. The overall conclusions of the thesis are that behavioural, not only direct trophic interactions are key when studying ecosystems.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- zooplankton
- non-indigenous species
- selectivity; food web
- rearing environment
- fish stocking
- Sander lucioperca
- diel vertical migration
- ontogeny
- ovigerous
- Marine Ecology
- marin ekologi
Publication and Content Type
- vet (subject category)
- dok (subject category)
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