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In particular, the reporting of 47 possible mixed effect models using 15 [?] explanatory variables and 4 taxonomic classes produce, in my view, a very high risk of generating a mass of statistical artefacts of unclear meaning. Many, if not most of the variables are likely to be highly correlated and consequently, as the authors should know, the results of mixed effects modelling can be very unstable. Standardizing input data does not increase my confidence.
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