Metabolic rate of Arctic charr eggs depends on their parentage |
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| Authors: | Susanna Pakkasmaa Olli-Pekka Penttinen Jorma Piironen |
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| Affiliation: | (1) Integrative Ecology Unit, Department of Ecology and Systematics, Division of Population Biology, University of Helsinki, P.O. Box 65, 00014 Helsinki, Finland;(2) Department of Ecological and Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140 Lahti, Finland;(3) Finnish Game and Fisheries Research Institute, Joensuu Game and Fisheries Research, Kauppakatu 18-20, 80100 Joensuu, Finland;(4) Present address: National Board of Fisheries, Institute of Freshwater Research, 178 93 Drottningholm, Sweden |
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| Abstract: | The metabolic rate (specific heat output) of individual eyed-stage eggs of Arctic charr Salvelinus alpinus (Linnaeus, 1758) originating from different families was measured with direct microcalorimetry. Metabolic rates varied between 2.3–7.9 μW ind−1 and 0.06–0.22 μW mg−1. Absolute heat output was unrelated to egg size, but size-scaled or specific heat output was negatively correlated with egg size, measured as diameter, dry mass or fresh mass. Metabolic rates varied significantly between families, suggesting that genetic and/or maternal effects affect embryonic metabolism in Arctic charr. Heat output increased almost linearly from 3.4 to 16.7 μW ind−1 (0.09–0.67 μW mg−1) during the embryonic development. Although the metabolic rate varied between the families and egg metabolic rate increased during development, there was an unexpected disconnect between metabolic rate and hatching time. |
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| Keywords: | Direct calorimetry Egg size Genetic and maternal effects Salmonids Specific heat output |
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