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Effekter av höjd inkubationstemperatur på ventilationshastighet, som ett mått på metabolism, hos öring (Salmo trutta)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Effects of raised incubation temperatures on ventilation rate, as a proxy for metabolic rate, in brown trout (Salmo trutta) (English)
Abstract [en]

The average global temperature is expected to rise by 3-5 °C at the end of the century, as a consequence of global warming. Negative effects are expected on poikilothermic animals, including fish, with changes in their physiology including metabolism. Metabolism has earlier been proven to have an association with propensities to migrate, which might be affected by raised temperatures as a consequence of global warming. The purpose of this study was to investigate if raised temperatures during incubation of eggs has an effect on metabolism in a partly migrating species of fish. The hypotheses for this study were: (i) ventilation rate (VR) will decrease as a consequence of warmer incubation temperatures, and (ii) offspring of anadromous parents are expected to have a higher VR compared to offspring of residential parents. VR, as a proxy for metabolic rate, was measured on young-of-the-year brown trout (Salmo trutta) during trials in respiration chambers. Fertilized eggs from four different crossings of parents (anadromous x anadromous, residential x residential, anadromous male x residential female, residential male x anadromous female) underwent incubation in normal and warm (normal + 3 °C) water temperatures respectively. A Two-way ANOVA showed a significant interaction between incubation temperature and crossing on VR. Warmer incubation temperatures in 3 out of 4 crossings resulted in a higher VR, except for individuals with two anadromous parents. Individuals with an anadromous father had a higher VR than individuals with a residential father. Evidence that partly supports both hypotheses was therefore found. Metabolism might have a strong genetic component, and other factors that might have an effect on metabolism and VR are epigenetics, stress, egg size etcetera. Studies of this kind will be of importance in getting a greater understanding of the effects of global warming on migrating species of fish, and on poikilothermic vertebrates in general.

Place, publisher, year, edition, pages
2019. , p. 10
Keywords [en]
brown trout, salmo trutta, ventilation rate, incubation temperature, global warming
Keywords [sv]
öring, salmo trutta, ventilationshastighet, inkubationstemperatur, global uppvärmning
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-72934OAI: oai:DiVA.org:kau-72934DiVA, id: diva2:1329305
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2019-06-28 Created: 2019-06-24 Last updated: 2019-06-28Bibliographically approved

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Biological Sciences

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Citation style
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