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• W2212227478 abstract "Aim Approaches to calculating beta diversity (β) include classical measures based on alpha (α) and gamma (γ) diversity, and multivariate distance-based measures. Species–area relationships cause measurements of γ to vary, making comparisons of classical β among regions contingent on sampling effort. A recent null-modelling approach has attempted to account for variation in γ by calculating the degree to which β deviates from a random expectation. Here, we clarify the mathematical links between classical and multivariate approaches to measuring β, to derive predictions regarding the reliability of classical, null-model and multivariate approaches. Next, we use four ecological datasets and simulated data to test the consistency of these approaches across sampling effort and γ. We focus on an issue that arises when making comparisons among regions, namely that even small changes to the area sampled can differentially increase measured γ in each region, potentially causing artefacts in β that are driven by methodology rather than biology. Innovation Comparisons among regions using classical and null-model measures change dramatically as sampling effort and γ increase. This change is understood for classical β because of species–area relationships, but not for null-model measures, making comparisons among regions impossible using the null-model approach. Multiple-site dissimilarity shows a similar sensitivity to γ as classical measures. In contrast, pairwise multivariate distances show no systematic effect of sampling effort and γ: increasing the number of sample plots decreases variability but does not alter mean β. Main conclusions Multivariate pairwise distances are independent of sample size, offering the most robust comparison among regions. The widespread influence of sampling effort and γ indicate that only scale-dependent measures of classical and multiple-site β are comparable, whereas null-model β may not be comparable among regions. However, in cases where γ is well known, multiple-site dissimilarity metrics offer several advantages, and should be strongly considered." @default.
• W2212227478 created "2016-06-24" @default.
• W2212227478 creator A5031152684 @default.
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• W2212227478 date "2015-12-23" @default.
• W2212227478 modified "2023-10-17" @default.
• W2212227478 title "Contrasting beta diversity among regions: how do classical and multivariate approaches compare?" @default.
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• W2212227478 doi "https://doi.org/10.1111/geb.12413" @default.
• W2212227478 hasPublicationYear "2015" @default.
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