TEMPORAL VARIATION FAVORS THE EVOLUTION OF GENERALISTS IN EXPERIMENTAL POPULATIONS OF DROSOPHILA MELANOGASTER
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作者:
Condon, Catriona
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Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USAArizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
Condon, Catriona
[1
]
Cooper, Brandon S.
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Indiana Univ, Dept Biol, Bloomington, IN 47405 USAArizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
Cooper, Brandon S.
[2
]
Yeaman, Sam
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Univ British Columbia, Dept Forestry, Vancouver, BC V6T 1Z4, Canada
Univ British Columbia, Dept Bot, Vancouver, BC V6T 1Z4, CanadaArizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
Yeaman, Sam
[3
,4
]
Angilletta, Michael J., Jr.
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Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USAArizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
Angilletta, Michael J., Jr.
[1
]
机构:
[1] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
[2] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
[3] Univ British Columbia, Dept Forestry, Vancouver, BC V6T 1Z4, Canada
[4] Univ British Columbia, Dept Bot, Vancouver, BC V6T 1Z4, Canada
In variable environments, selection should favor generalists that maintain fitness across a range of conditions. However, costs of adaptation may generate fitness trade-offs and lead to some compromise between specialization and generalization that maximizes fitness. Here, we evaluate the evolution of specialization and generalization in 20 populations of Drosophila melanogaster experimentally evolved in constant and variable thermal environments for 3 years. We developed genotypes from each population at two temperatures after which we measured fecundity across eight temperatures. We predicted that constant environments would select for thermal specialists and that variable environments would select for thermal generalists. Contrary to our predictions, specialists and generalists did not evolve in constant and spatially variable environments, respectively. However, temporal variation produced a type of generalist that has rarely been considered by theoretical models of developmental plasticity. Specifically, genotypes from the temporally variable selective environment were more fecund across all temperatures than were genotypes from other environments. These patterns suggest certain allelic effects and should inspire new directions for modeling adaptation to fluctuating environments.
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页码:720 / 728
页数:9
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[1]
Angilletta MJ, 2009, BIO HABIT, P1, DOI 10.1093/acprof:oso/9780198570875.001.1