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Rearing environment affect important life skills in pikeperch (Sander lucioperca)
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2012 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 17, no 3-4, 291-304 p.Article in journal (Refereed) Published
Abstract [en]

The effect of rearing environment on the behaviour of young-of-the-year pikeperch (Sander lucioperca) bred at three different production facilities was investigated. Two groups were reared in semi-natural ponds and one group in indoor tanks. Exploratory, foraging and anti-predator behaviours were studied in aquarium experiments. There were no significant differences between pond- and tank-reared fish in reluctance to explore their new environment, but pond-reared fish spent significantly more time in macro-vegetation. Pond-reared fish were significantly faster to start foraging on live prey (Neomysis integer) that they had not encountered before. As compared with tank-reared fish, pond-reared fish were also significantly more active in their anti-predator response. Rearing environment obviously influences the development of important life skills. These differences may impact the success rate when stocking young-of-the-year pikeperch into natural waters.

Place, publisher, year, edition, pages
2012. Vol. 17, no 3-4, 291-304 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-75276ISI: 000306093600010OAI: oai:DiVA.org:su-75276DiVA: diva2:515878
Available from: 2012-04-16 Created: 2012-04-13 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Living in a predation matrix: Studies on fish and their prey in a Baltic Sea coastal area
Open this publication in new window or tab >>Living in a predation matrix: Studies on fish and their prey in a Baltic Sea coastal area
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis was written within the framework of a biomanipulation project where young-of-the-year (YOY) pikeperch (Sander lucioperca) were stocked to a Baltic Sea bay to improve water quality through a top-down trophic cascade. The aim of my doctorial studies was however focused on a broader ecological question, namely predation (the main driving force in a biomanipulation). Hence, this thesis consists of four papers where we study the interactions between predator and prey using fish and zooplankton and how these interactions can be measured.

In paper I we evaluated the performance of different diet analysis methods by individual based modelling and found that when having a nutritional gain perspective, mass based methods described diets best. Paper II investigated how the explorative, foraging and anti-predator behaviour of the YOY pikeperch used for stocking were affected by their rearing environment (pond vs. tank rearing). The more complex and varied environment in the semi-natural ponds seemed to promote a more flexible and active behaviour, better equipping young fish for survival in the wild. For paper III we studied the diel vertical migration in the six copepodite stages of the zooplankton Acartia spp. and Eurytemora affinis in relation to fish biomass, phytoplankton abundance and temperature. Both species migrated and in addition showed increased migration range with size within species, indicating evasion from visual predators. Paper IV addressed the movement of littoral Eurasian perch (Perca fluviatilis) via stable isotope signatures (13C and 15N) and body condition. We found clear indications of sedentarity and intra-habitat dietary differences. Interactions between predators and prey are complex and affected by both physiological and environmental characteristics as well as behavioural traits. The results in this thesis suggest that different species and even different life stages pursue different strategies to survive.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 32 p.
Keyword
diet analysis methods, Sander lucioperca, behaviour, rearing environment, diel vertical migration, Acartia spp., Eurytemora affinis, Perca fluviatilis, stable isotopes, body condition, sedentarity
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-75238 (URN)978-91-7447-508-1 (ISBN)
Public defence
2012-06-01, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 08:30 (English)
Opponent
Supervisors
Note
At the time of doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted.  Paper 2: In press.  Paper 4: Submitted.Available from: 2012-05-10 Created: 2012-04-12 Last updated: 2012-06-15Bibliographically approved
2. Trophic interactions and behaviour: Studies relevant to a Baltic Sea biomanipulation
Open this publication in new window or tab >>Trophic interactions and behaviour: Studies relevant to a Baltic Sea biomanipulation
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

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.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 31 p.
Keyword
zooplankton, non-indigenous species, selectivity; food web, rearing environment, fish stocking, Sander lucioperca, diel vertical migration, ontogeny, ovigerous
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-79075 (URN)978-91-7447-567-8 (ISBN)
Public defence
2012-10-05, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoraldefense, the following papers were unpublished and had a status asfollows: Paper2: In press. Paper 4: Manuscript.

Available from: 2012-09-13 Created: 2012-08-26 Last updated: 2012-08-27Bibliographically approved

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