Temperature-induced shifts in selective pressure at a critical developmental transition |
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Authors: | Monica Gagliano Mark I McCormick Mark G Meekan |
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Institution: | (1) Australian Research Council Centre of Excellence for Coral Reef Studies, School of Marine and Tropical Biology, James Cook University, Townsville, QLD, 4811, Australia;(2) Australian Institute of Marine Science, Building 42, Northern Territory University, Darwin, NT, 0909, Australia |
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Abstract: | Selective mortality within a population, based on the phenotype of individuals, is the foundation of the theory of natural
selection. We examined temperature-induced shifts in the relationships among early life history traits and survivorship over
the embryonic and larval stages of a tropical damselfish, Pomacentrus amboinensis. Our experiments show that temperature determines the intensity of selective mortality, and that this changes with ontogeny.
The size of energy stores determined survival through to hatching, after which egg size became a good indicator of fitness
as predicted by theoretical models. Yet, the benefits associated with egg size were not uniform among test temperatures. Initial
egg size positively influenced larval survival at control temperature (29 °C). However, this embryonic trait had no effect
on post-hatching longevity of individuals reared at the higher (31 °C) and lower (25 °C) end of the temperature range. Overall,
our findings indicate that the outcome of selective mortality is strongly dependent on the interaction between environment
conditions and intrinsic developmental schedules. |
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Keywords: | Bigger is better hypothesis Early life history traits Egg size Selective mortality Coral reef fish |
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