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Table 2.

Byssal thread material properties

Species (N)Yield stress (MPa)Strength (MPa)Initial stiffness (MPa)Final stiffness (MPa)ExtensibilityToughness (Jm–3)
Atrina rigida (13) 24.5±2.8A,B 90.2±12.8A 609.2±86.0A,B 167.8±33.7A 0.444±0.033A 24.1±4.3A,B 
Ctenoides mitis (18) 5.2±0.7C 55.1±06.0A 101.6±18.4C 210.0±30.3A 0.805±0.031B 15.9±2.0B 
Geukensia demissa (19) 23.9±4.2B 140.8±18.7A,B 324.7±60.8A,B,C 319.1±45.2A 0.637±0.018C 43.3±5.6A,B,C 
Modiolus modiolus (20) 35.5±5.8A,B 287.8±35.6C 593.3±94.6B 1039.6±129.0B 0.571±0.024C 67.4±8.5C 
Mytilus californianus (21) 33.0±2.9A,B 215.3±25.3B,C 432.3±45.5A,B 810.0±93.9B 0.640±0.016C 51.7±5.9A,C 
Mytilus edulis (25) 44.4±6.6A 216.9±18.8B,C 328.6±30.8A,C 784.4±62.7B 0.669±0.017C 56.9±6.3C 
Scheffe test, P-values <0.0327 <0.0369 <0.0475 <0.0034 <0.0302 <0.0347 
Species (N)Yield stress (MPa)Strength (MPa)Initial stiffness (MPa)Final stiffness (MPa)ExtensibilityToughness (Jm–3)
Atrina rigida (13) 24.5±2.8A,B 90.2±12.8A 609.2±86.0A,B 167.8±33.7A 0.444±0.033A 24.1±4.3A,B 
Ctenoides mitis (18) 5.2±0.7C 55.1±06.0A 101.6±18.4C 210.0±30.3A 0.805±0.031B 15.9±2.0B 
Geukensia demissa (19) 23.9±4.2B 140.8±18.7A,B 324.7±60.8A,B,C 319.1±45.2A 0.637±0.018C 43.3±5.6A,B,C 
Modiolus modiolus (20) 35.5±5.8A,B 287.8±35.6C 593.3±94.6B 1039.6±129.0B 0.571±0.024C 67.4±8.5C 
Mytilus californianus (21) 33.0±2.9A,B 215.3±25.3B,C 432.3±45.5A,B 810.0±93.9B 0.640±0.016C 51.7±5.9A,C 
Mytilus edulis (25) 44.4±6.6A 216.9±18.8B,C 328.6±30.8A,C 784.4±62.7B 0.669±0.017C 56.9±6.3C 
Scheffe test, P-values <0.0327 <0.0369 <0.0475 <0.0034 <0.0302 <0.0347 

Values given are means ± s.e.m. Data for species in the last four rows are from our previous study (Pearce and LaBarbera, 2009). For each material property listed, the null hypothesis of similar values across species was robustly rejected (ANOVA: P<0.0001; Kruskal–Wallis: P<0.0001). In each column, values marked with the same superscript letter are not significantly different from one another (Scheffe test). Because the yield point was not obvious in all tests, only 12 M. edulis, 13 M. modiolus and 20 M. californianus data points were used in the analysis for yield stress

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