Fitness consequences of early life conditions and maternal size effects in a freshwater top predator

The Journal of Animal Ecology
Yngvild VindenesL Asbjørn Vøllestad

Abstract

Conditions experienced in early life stages can be an important determinant of individual life histories. In fish, environmental conditions are known to affect early survival and growth, but recent studies have also emphasized maternal effects mediated by size or age. However, the relative sensitivity of the mean fitness (population growth rate λ) to different early life impacts remains largely unexplored. Using a female-based integral projection model (IPM) parameterized from unique long-term demographic data for pike (Esox lucius), we evaluated the relative fitness consequences of different early life impacts, including (i) maternal effects of length on egg weight, potentially affecting offspring (first year) survival, and (ii) effects of temperature on offspring growth and survival. Of the seven vital rates defining the model, offspring survival could not be directly estimated and four scenarios were defined for this rate. Elasticity analyses of the IPM were performed to calculate (i) the total contribution from different lengths to the elasticity of λ to the projection kernel, and (ii) the elasticity of λ to underlying variables of female current length, female offspring length at age 1, and temperature. These elasticities ...Continue Reading

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Citations

Jan 25, 2017·Proceedings of the National Academy of Sciences of the United States of America·Leif Christian StigeGeir Ottersen
Dec 4, 2019·Ecology and Evolution·Marlene Wæge StubberudØystein Langangen

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