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Species ecological similarity modulates the importance of colonization history for adaptive radiation [Evolution]

Keywords : adaptive radiation, colonization history, fitness difference, niche difference

par Frédéric Magné - publié le

Adaptive radiation is an important evolutionary process, through which a single ancestral lineage rapidly gives rise to multiple newly formed lineages that specialize in different niches. In the first-arrival hypothesis, David Lack emphasized the importance of species colonization history for adaptive radiation, suggesting that the earlier arrival of a diversifying species would allow it to radiate to a greater extent. Here, we report on the first rigorous experimental test of this hypothesis, using the rapidly evolving bacterium Pseudomonas fluorescens SBW25 and six different bacterial competitors.(...)

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