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Temperature-induced shifts in selective pressure at a critical developmental transition

Gagliano, M, McCormick, MI and Meekan, MG (2007). Temperature-induced shifts in selective pressure at a critical developmental transition. Oecologia,152(2):219-225.

Document type: Journal Article
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Title Temperature-induced shifts in selective pressure at a critical developmental transition
Author Gagliano, M
McCormick, MI
Meekan, MG
Journal Name Oecologia
Publication Date 2007
Volume Number 152
Issue Number 2
ISSN 1432-1939   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-34248142896
Start Page 219
End Page 225
Total Pages 7
Place of Publication Berlin
Publisher Springer
HERDC Category C1 - Journal Article (DEST)
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 degrees C). However, this embryonic trait had no effect on post-hatching longevity of individuals reared at the higher (31 degrees C) and lower (25 degrees 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.
Keywords bigger is better hypothesis
early life history traits
egg size
selective mortality
coral reef fish
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Created: Mon, 08 Sep 2008, 16:16:22 CST