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Kantzonsvegetationens inverkan på dieten hos öring (Salmo trutta) i en skogsbäck
Karlstad University, Faculty of Social and Life Sciences.
2008 (Swedish)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
Abstract [sv]

Effekterna på öringens (Salmo trutta) diet till följd av en avverkning av kantzonsvegetationen har undersökts i ett fältexperiment, där två av de potentiella effekterna av en skogsavverkning simulerades. Fokus låg på de två faktorerna ökad ljusinstrålning och minskat nedfall av terrestra evertebrater. Ökad ljusinstrålning har simulerats med hjälp av montage av lysrör och nedfall av terrestra evertebrater med hjälp av plasttält. Frågeställningarna rör andelen terrester föda i olika behandlingar och årstider, dietskillnader mellan äldre och yngre öringindivider, skillnader i mängden akvatisk föda vid ökad ljusinstrålning samt en taxonomisk översikt av dietens sammansättning. Signifikanta skillnader mellan behandlingarna fanns, där individerna i kontrollbehandlingen åt signifikant mer terrester föda än individer i tältbehandlingen och den kombinerade tält- och ljusbehandlingen. Signifikanta skillnader fanns även mellan provtagningstillfällena där en högre andel terrester föda återfinns senare på säsongen. Inga signifikanta skillnader fanns med avseende på andelen terrester föda mellan äldre och yngre individer, ej heller mellan mängd akvatisk föda mellan de olika behandlingarna. Den akvatiska födan var mer varierad och divers än den terrestra, och daggmaskar (Lumbriculidae) var en mycket vanlig födopartikel.

Abstract [en]

The effects on the diet of brown trout (Salmo trutta) of a clear cutting of the riparian vegetation has been investigated in a field-experiment, where two of the potential effects of a clear cut were simulated. The focus was placed on the two factors increased light and input of terrestrial invertebrates. The increase of ligth was manipulated by placing fluorescent lights over the brook and the input of terrestrial invertebrates was manipulated by placing plastic tents over the brook. Issues discussed are the percentage terrestrial food in the different treatments and at the different times of sampling, differences in the percentage terrestrial food between older and younger individuals of brown trout, differences in the amount of aquatic food in the light-treatment and a taxonomic summary of the composition of the diet. There were significant differences between the the different treatments, where the individuals in the control treatment ate significantly more terrestrial food as compared to the individuals in the tent and in the combined light and tent treatment. There was also a significant difference between the different times of sampling, more terrestrial food was consumed later in the season. No sigificant differences were detected between older and younger individuals concerning the percentage of terrestrial food eaten, nor between the different treatments concearning the amount of aquatic food consumed. The aquatic food showed a wider variation and was more diverse as compared to the terrestrial food, and earthworms (Lumbriculidae) was a very common food item.

Place, publisher, year, edition, pages
2008. , p. 15
Keywords [en]
Brown trout, Salmo trutta, diet, input of terrestrial invertebrates, light, riparian vegetation
Keywords [sv]
Öring, Salmo trutta, diet, nedfall av terrestra evertebrater, ljus, kantzonsvegetation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-1404OAI: oai:DiVA.org:kau-1404DiVA, id: diva2:5278
Presentation
2007-12-18
Uppsok
bio-/geovetenskap
Supervisors
Examiners
Available from: 2008-02-07 Created: 2008-02-07

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