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Effekter av inkuberingstemperatur på kroppsform och fenstorlek hos juvenil atlantlax (Salmo salar L.)
Karlstad University.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Effects of incubation temperature on body shape and fin size in juvenile Atlantic salmon (Salmo salar L.) (English)
Abstract [en]

Global warming, a consequence of the ongoing climate change, is expected to increase the mean global temperature by up to 5°C this century. This is predicted to have various impacts on the earth's ecosystems and especially on ectotherms which cannot regulate body temperature by endogenous heat production. There is an intensified interest in investigating the outcomes of climate change and the role of developmental phenotypic plasticity in relation to environmental conditions experienced early in life. Here I compare the body shape and fin size of juvenile Atlantic salmon that had been incubated at two different temperature regimes during embryogenesis. Morphometric methods were used to compare body size through a box-truss network of Euclidean distances and the data were then analyzed using discriminant analysis. Fin size was analyzed by comparing fin area using analysis of covariance with body size as the covariate. The fish incubated in ambient (cold) temperatures differed from the fish incubated in ca. 4°C warmer temperatures by having a deeper body shape and bigger pectoral fin area. There was no significant difference for dorsal fin area. My findings support the notion that Atlantic salmon are morphologically plastic when exposed to different temperature regimes during embryogenesis, but additional studies are needed to determine the ecological consequences of these changes.

Abstract [sv]

Global uppvärmning, en konsekvens av pågående klimatförändringar, förväntas öka den globala medeltemperaturen med upp till 5°C det här århundradet. Det här förväntas ha stor påverkan på jordens ekosystem och speciellt ektotermer som inte kan reglera sin kroppstemperatur genom endogen värmeproduktion. Intresset har intensifierats för att undersöka klimatförändringarnas utfall och rollen som fenotypisk plasticitet har som svar på tidiga miljöförhållanden. Kroppsform och fenstorlek jämfördes hos juvenil atlantlax som inkuberats i två olika temperaturbehandlingar under embryogenesen. Morfometri användes för att undersöka kroppsformen genom ett box-truss nätverk av euklidiska avstånd som sedan analyserades med en diskriminant funktionsanalys. Fenstorleken analyserades genom att mäta fenornas area som sedan användes i en kovariansanalys med kroppsstorlek som kovariat. Fiskarna som inkuberades i normal (kall) temperatur skiljde sig från fiskarna som inkuberats i ca 4°C varmare temperatur genom att ha en djupare kroppsform och större area på bröstfenorna. Det fanns ingen signifikant skillnad mellan ryggfenornas area. Mina resultat stödjer idén att atlantlaxen är morfologiskt plastisk när den utsätts för olika temperaturbehandlingar under embryogenesen, men ytterligare studier behövs för att identifiera de ekologiska konsekvenserna av dessa förändringar.

Place, publisher, year, edition, pages
2017. , p. 13
Keywords [en]
Salmon, Salmo salar, fish, incubation temperature, egg, temperature, incubation, climate change, morphology, body shape, fin size
Keywords [sv]
Lax, Salmo salar, fisk, inkuberingstemperatur, ägg, rom, temperatur, inkubering, klimatförändringar, morfologi, kroppsform, fenor
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-65117OAI: oai:DiVA.org:kau-65117DiVA, id: diva2:1154950
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2017-11-24 Created: 2017-11-06 Last updated: 2017-11-24Bibliographically approved

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