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Anderson, Marti J.; Crist, Thomas O.; Chase, Jonathan M.; Vellend, Mark; Inouye, Brian D.; Freestone, Amy L.; Sanders, Nathan J.; Cornell, Howard V.; Comita, Liza S.; Davies, Kendi F.; Harrison, Susan P.; Kraft, Nathan J. B.; Stegen, James C.; Swenson, Nathan G.
Ecology letters, 01/2011, Volume: 14, Issue: 1Journal Article
Ecology Letters (2011) 14: 19–28 A recent increase in studies of β diversity has yielded a confusing array of concepts, measures and methods. Here, we provide a roadmap of the most widely used and ecologically relevant approaches for analysis through a series of mission statements. We distinguish two types of β diversity: directional turnover along a gradient vs. non‐directional variation. Different measures emphasize different properties of ecological data. Such properties include the degree of emphasis on presence/absence vs. relative abundance information and the inclusion vs. exclusion of joint absences. Judicious use of multiple measures in concert can uncover the underlying nature of patterns in β diversity for a given dataset. A case study of Indonesian coral assemblages shows the utility of a multi‐faceted approach. We advocate careful consideration of relevant questions, matched by appropriate analyses. The rigorous application of null models will also help to reveal potential processes driving observed patterns in β diversity.
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