Fig. 8. Mussel tenacity vs thread production. Thread production values are the least square means (± s.e.m.) of pooled data from each simulated wave action experiment. Tenacity in the corresponding months was estimated as mean (± s.e.m.) of 6 years of measurements at Bass Rock (see text for details). A linear regression of the data was not significant (P=0.18, r²=0.24; y=–0.17x+8.89).