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Dominans hos juvenila lax (Salmo salar L.): betydelsen av rommens inkuberingstemperatur
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The Earth's temperature is predicted to increase by 3-5 °C, the warmer climate is expected to have major effects on aquatic ectotherms. Water temperature is an important environmental factor as it has indirect and direct effects on morphological traits and behaviour of salmonid fishes. Studies have shown that salmon whose eggs have been incubated at higher water temperatures grow faster and have lower metabolic rates than those incubated in colder water temperatures. Metabolic rates and changes in growth may affect behaviour such as dominance and aggression. Salmon that had been incubated in natural temperatures (cold) and elevated temperatures (warm) were studied to investigate if there were any differences in aggression and dominance between treatment groups. The results showed that there was no significant difference between individuals experiencing different temperature treatments during embryogenesis in terms of dominance and aggressive behaviours. However, temperature during embryogenesis may impact other types of behaviour and characteristics of salmonids. Since previous studies have shown that a lower metabolic rate affects fish behaviour, other factors may have a greater influence on temperature.

Abstract [sv]

Då ett varmare klimat förutspås att öka jordens temperatur med 3–5 °C kommer det ha stora effekter hos vattenlevande ektotermer. Vattentemperaturen är en viktig miljöfaktor då den påverkar indirekta och direkta fysiologiska egenskaper hos laxfiskar, som morfologiska egenskaper och beteenden. Studier har visat att lax vars ägg som har inkuberats i högre vattentemperaturer växer snabbare och har en lägre ämnesomsättning än fiskar vars ägg inkuberats vid lägre vattentemperaturer. Ämnesomsättningen och förändringar i tillväxt har visats påverka beteenden som dominans och aggression. Laxfiskar som inkuberats i naturliga temperaturer och förhöjda temperaturer studerades för att undersöka om det fanns några skillnader i aggression och dominans. Resultatet visade att ingen signifikant skillnad fanns i beteende som aggression och dominans mellan individer från de olika temperaturbehandlingarna. Det är dock möjligt att vattentemperatur under embryogenes kan påverka andra beteenden och egenskaper hos laxfiskar. Då tidigare studier har visat att en lägre ämnesomsättning påverkar fiskens beteenden, är det möjligt att andra faktorer kan ha en större påverkan av vattentemperatur. 

Place, publisher, year, edition, pages
2017. , p. 13
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kau:diva-55120OAI: oai:DiVA.org:kau-55120DiVA, id: diva2:1111043
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2017-09-14 Created: 2017-06-16 Last updated: 2017-09-14Bibliographically approved

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