TEMPORAL VARIATION FAVORS THE EVOLUTION OF GENERALISTS IN EXPERIMENTAL POPULATIONS OF DROSOPHILA MELANOGASTER

被引:68
作者
Condon, Catriona [1 ]
Cooper, Brandon S. [2 ]
Yeaman, Sam [3 ,4 ]
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
基金
美国国家卫生研究院;
关键词
thermal adaptation; Acclimation; phenotypic plasticity; specialist-generalist trade-offs; experimental evolution; ADAPTIVE PHENOTYPIC PLASTICITY; ADDITIVE GENETIC VARIANCE; REACTION NORMS; ENVIRONMENTAL HETEROGENEITY; WING SHAPE; ADAPTATION; SELECTION; ACCLIMATION; TEMPERATURE; RESISTANCE;
D O I
10.1111/evo.12296
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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.
引用
收藏
页码:720 / 728
页数:9
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