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Predatorinducerad fekunditet hos Daphnia pulex vid simulerade årstidsbundna temperaturvariationer
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2015 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesisAlternative title
Predator induced fecundity in simulated seasonal temperature variations in Daphnia pulex (English)
Abstract [en]

Female growth, number of eggs and egg growth of Daphnia pulex were studied at four temperatures, 12, 16, 18 and 20°C. I hypothesized that female growth and number of eggs would be lower and the size of the eggs larger in the presence of a predator (kairomones) than in its absence. This effect was expected to be more evident at lower temperatures. I could not find any effect of kairomones on female growth, number of eggs or egg size, although there was a weak tendency for an effect on number of eggs. There was, however, an effect of temperature, regardless of predator treatment (i. e. presence vs absence of kairomones), on number of eggs, where females produced fewer numbers of eggs with increasing temperature. The effect temperature on the number of eggs was not anticipated. Two of the temperatures, 12 and 18°C, were carried out in darkness due to malfunctioning equipment. In addition, for some unknown reason, a high ratio between the number of ephippia and eggs occurred at at16 and 18°C, regardless of predator treatment. These complicating factors (darkness and ephippia) can have had a negative effect on detecting a response by Daphnia to kairomones.

Abstract [sv]

Honors tillväxt, antal ägg och äggens tillväxt hos Daphnia pulex studerades vid fyra olika temperaturer, 12, 16, 18 och 20°C. Min hypotes var att honorna tillväxer mindre och producerar färre ägg, men med större storlek vid närvaro av predator (kairomoner) än utan. Denna effekt förväntades bli tydligare med lägre temperatur. Jag kunde inte påvisa någon effekt av kairomoner varken på honors tillväxt, antal ägg eller storlek på ägg, men det fanns en svag effekt på antalet ägg. Det fanns dock en effekt av temperaturen på antalet ägg oberoende av predatorbehandling (med respektive utan kairomoner), där honorna bildade färre antal ägg med ökande temperatur. Effekten av temperatur på antalet ägg var inte som väntat. Två av temperaturerna, 12 och 18 oC, kördes i mörker pga icke fungerande utrustning. Dessutom, av okänd anledning, var förhållandet mellan antal ephippier och ägg högt vid 16 och 18 oC. Dessa komplicerande faktorer, mörker och andel viloägg, kan ha påverkat den uteblivna effekten av predatorbehandlingen.

Place, publisher, year, edition, pages
2015. , 19 p.
Keyword [sv]
limnologi, Daphnia pulex, predatorinducerad fekunditet, temperaturvariation
National Category
Other Biological Topics
Identifiers
URN: urn:nbn:se:kau:diva-36992OAI: oai:DiVA.org:kau-36992DiVA: diva2:833648
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2015-06-30 Created: 2015-06-30 Last updated: 2015-06-30Bibliographically approved

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