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Table 3

R values from one-way (summer) and two-way (winter) ANOSIM tests in Dorset (Rivers Frome and Piddle) and London (Rivers Rib and Lee). The one-way ANOSIM tests for differences in community composition between heads and tails of riffles at one depth (35 cm) during summer. The two-way ANOSIM test for differences with depth (20 and 35 cm), in addition to the distribution of fauna between heads and tails of riffles. Significant values (P < 0.05) are in bold.

Position Dorset Dorset London London
Summer Winter Summer Winter
Head vs. tail 0.045 0.01 0.001 0.06
Depth 0.02 0.04

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