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Table 1.

Byssal thread diameter and shell length

SpeciesThread diameter (μm)Range in shell length (mm)
Geukensia demissa 37.6±2.3 (32)A 62.2–76.9 [69.1±1.6] (11) 
Modiolus modiolus 46.3±2.4 (28)A 49.2–72.3 [57.9±2.0] (12) 
Atrina rigida* 54.2±3.3 (20)A 119, 131 (2) 
Ctenoides mitis* 103.5±13.2 (30)B 43.3–59.3 [49.4±1.7] (10) 
Perna canaliculus 129.7±8.2 (34)B,C 50.0–70.0 [62.3±2.7] (7) 
Mytilus edulis 132.3±6.0 (55)B,C 58.6–88.4 [72.6±3.4] (10) 
Mytilus californianus 149.6±6.6 (30)C 49.4–91.4 [70.0±6.1] (7) 
SpeciesThread diameter (μm)Range in shell length (mm)
Geukensia demissa 37.6±2.3 (32)A 62.2–76.9 [69.1±1.6] (11) 
Modiolus modiolus 46.3±2.4 (28)A 49.2–72.3 [57.9±2.0] (12) 
Atrina rigida* 54.2±3.3 (20)A 119, 131 (2) 
Ctenoides mitis* 103.5±13.2 (30)B 43.3–59.3 [49.4±1.7] (10) 
Perna canaliculus 129.7±8.2 (34)B,C 50.0–70.0 [62.3±2.7] (7) 
Mytilus edulis 132.3±6.0 (55)B,C 58.6–88.4 [72.6±3.4] (10) 
Mytilus californianus 149.6±6.6 (30)C 49.4–91.4 [70.0±6.1] (7) 

Values given are means ± s.e.m., followed by the sample size(N). Data for species marked with an asterisk are from this study. All other data are from our previous study(Pearce and LaBarbera, 2009). There were significant differences in thread thickness between species (ANOVA: P<0.0001; Kruskal–Wallis: P<0.0001). Values marked with the same superscript letter are not significantly different from one another (Scheffe test). Each of the semi-infaunal species – first three rows – had significantly thinner threads than each of the epifaunal species – last four rows (Scheffe test: P<0.0120)

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