The distribution of the invasive non-native gastropod Crepidula fornicata in the Milford Haven Waterway, its northernmost population along the west coast of Britain

Table 3 Distribution of Crepidula fornicata in the subtidal zone of the Milford Haven Waterway in South Wales, UK

	SS	SS/MS_total	df	p
Site	99,977.3	95.4	3	<0.001
Distance to 0 m a. C.D.	476.0	0.5	1	0.500
Site × distance	2048.0	2.0	3	0.582

Results of nonparametric two-way crossed Scheirer–Ray–Hare test and Mann–Whitney pairwise comparisons to test for differences in C. fornicata densities between two parallel transect with varying distance to 0 m above C.D. at four study sites (BR Beggars Reach, CO Cosheston, HA Hazelbeach, PE Pennar). Nonparametric tests were chosen due to heterogeneity in variances that could not be removed with data transformations. Significant differences are shown in bold

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