Fluctuating selection: the perpetual renewal of adaptation in variable environments.

Philos Trans R Soc Lond B Biol Sci · 2010 · PMC2842698 · PMID 20008388

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an overall trendno p-value reported

Conditions will thereby change on all time-scales, and will fluctuate around an overall trend, no matter what period of time is chosen for a survey.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.