Patterns of species association reveal that terrestrial plant and animal communities today are structured differently from communities spanning the 300 million years that preceded large-scale human activity. See Letter p.80
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Dietl, G. Different worlds. Nature 529, 29–30 (2016). https://doi.org/10.1038/nature16329
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DOI: https://doi.org/10.1038/nature16329
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Questioning Holocene community shifts
Nature (2016)
Silvio Pitlik
Let assume that Species 1 (S-1) is a crop and Species 2 (S-2) is a weed that looks very similar to S-1.The frequent association of of S-1 with S-2 may be caused by a common environmental factor needed for growth of both species or alternatively, by the persistence of S-2 during anthropological removal of weeds: S-2 hides and escapes removal thanks to its similarity to S-1.
Wen Smith
I am not really convinced that this result is not a statistical artefact. In particular there may be more statistical power to detect cooccurrence than segregation. So when sample sizes are smaller (presumably for the pre Holocene data) cooccurence could spuriously seem more common than segregation. It seems to me that the authors have not properly addressed this concern.