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Hard and soft selection on phenology through seasonal shifts in the general and social environments: A study on plant emergence time
Author(s) -
Weis Arthur E.,
Turner Kyle M.,
Petro Bergita,
Austen Emily J.,
Wadgymar Susana M.
Publication year - 2015
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/evo.12677
Subject(s) - biology , selection (genetic algorithm) , phenology , adaptation (eye) , ecology , frequency dependent selection , climate change , computer science , neuroscience , artificial intelligence
The timing of transition out of one life‐history phase determines where in the seasonal succession of environments the next phase is spent. Shifts in the general environment (e.g., seasonal climate) affect the expected fitness for particular transition dates. Variation in transition date also leads to temporal variation in the social environment. For instance, early transition may confer a competitive advantage over later individuals. If so, the social environment will impose frequency‐ and density‐dependent selection components. In effect, the general environment imposes hard selection, whereas the social environment imposes soft selection on phenology. We examined hard and soft selection on seedling emergence time in an experiment on Brassica rapa . In monoculture (uniform social environment), early emergence results in up to a 1.5‐fold increase in seed production. In bicultures (heterogeneous social environment), early‐emerging plants capitalized on their head start, suppressing their late neighbors and increasing their fitness advantage to as much as 38‐fold, depending on density. We devised a novel adaptation of contextual analysis to partition total selection (i.e., cov( ω, z )) into the hard and soft components. Hard and soft components had similar strengths at low density, whereas soft selection was five times stronger than hard at high density.

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