At stony sites, overall mean taxon richness was
higher at sites without crayfish (F = 7.55, d.f. = 1,
P = 0.01) (Fig. 3a), but a significant interaction between
crayfish status and depth (F = 5.53, d.f. = 2, P < 0.01)
suggested that the effect of crayfish on taxon richness
was related to depth.
At stony sites, overall mean taxon richness washigher at sites without crayfish (F = 7.55, d.f. = 1,P = 0.01) (Fig. 3a), but a significant interaction betweencrayfish status and depth (F = 5.53, d.f. = 2, P < 0.01)suggested that the effect of crayfish on taxon richnesswas related to depth.
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