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Table 1.

Diameter, shell length and breaking force

SpeciesThread diameter (μm)Range in shell length (mm)Breaking force (N)
Geukensia demissa (S) 37.6±2.2 (32) 62.2–76.9 [69.1±1.6] (11) 0.074±0.008 (19)A 
Modiolus modiolus (S) 46.3±2.4 (28) 49.2–72.3 [57.9±2.0] (12) 0.218±0.009 (20)A 
Mytilus californianus (E) 149.6±6.6 (30) 49.4–91.4 [70.0±6.1] (7) 1.636±0.129 (21)B 
Mytilus edulis (E) 132.3±6.0 (55) 58.6–88.4 [72.6±3.4] (10) 1.018±0.074 (25)C 
Perna canaliculus (E) 129.7±8.2 (34) 50.0–70.0 [62.3±2.7] (7) – 
SpeciesThread diameter (μm)Range in shell length (mm)Breaking force (N)
Geukensia demissa (S) 37.6±2.2 (32) 62.2–76.9 [69.1±1.6] (11) 0.074±0.008 (19)A 
Modiolus modiolus (S) 46.3±2.4 (28) 49.2–72.3 [57.9±2.0] (12) 0.218±0.009 (20)A 
Mytilus californianus (E) 149.6±6.6 (30) 49.4–91.4 [70.0±6.1] (7) 1.636±0.129 (21)B 
Mytilus edulis (E) 132.3±6.0 (55) 58.6–88.4 [72.6±3.4] (10) 1.018±0.074 (25)C 
Perna canaliculus (E) 129.7±8.2 (34) 50.0–70.0 [62.3±2.7] (7) – 

Values are means ± s.e.m., followed by the sample size (N). The threads of semi-infaunal species, marked `S', were significantly thinner than those of epifaunal species, marked `E' (ANOVA, Scheffe test: P<0.0001; Kruskal–Wallis: P<0.0001). Shell length ranges of sampled individuals were strongly overlapping. In the`Breaking force' column, values marked with the same superscript letter are not significantly different from one another (Scheffe test: P<0.0001). M. californianus threads broke at significantly higher forces than M. edulis threads

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