Comment on “A keystone mutualism drives pattern in a power function


disrupts the power law distribution of scale insect abundances. However, reanalysis of the data reveals that ants cause an increase in the range of the power law and modify its exponent. We present a tentative, but more realistic, model that is suitable for quantitative predictions. S caling laws and their underlying mech-anisms pervade biological research (1, 2). In particular, several authors (3–5) have suggested that animal group sizes display a power law statistical distribution f ðxÞ 0 axjb ð1Þ where x is abundance, f is probability density, and a and b are constants, which corresponds to a straight line in a plot of log(x) versus logE f(x)^ (e.g., Fig. 1B). Vandermeer and Perfecto (6) compared th

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