Does rock type account for variation in mussel attachment strength? A test with Brachidontes rodriguezii in the southwestern Atlantic

Table 4 Results of t-tests evaluating the effect of rock type on mean byssal tread counts, mean mussel attachment strength, and the mean proportion of four thread failure locations per individual mussel

Variable	df	t	P
Byssal thread counts^a	28	4.28	< 0.01
Attachment strength	64	0.90	0.37
Thread failure (%)	28	0.49	0.63
Plaque failure (%)^a	28	3.22	< 0.01
Rock failure (%)	28	2.99	< 0.01
Loose particle failure (%)	28	1.97	0.06

ISSN: 1438-3888