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Table 3.

Selected coefficients from partial correlation matrices

Species (N)Strength–toughnessYield stress–initial stiffnessStrength–final stiffnessToughness–final stiffnessInitial stiffness–final stiffness
Atrina rigida (13) 0.793 0.649 –0.068 0.311 0.054 
Ctenoides mitis (18) 0.758 0.126 0.883 – – 
Geukensia demissa (19) 0.955 0.410 0.706 –0.551 0.514 
Modiolus modiolus (13) 0.855 0.620 –0.159 0.549 0.091 
Mytilus californianus (21) 0.982 0.579 0.756 –0.641 – 
Mytilus edulis (12) 0.952 – 0.769 –0.603 0.563 
P-values <0.0001 <0.0001 <0.0025 <0.0004 <0.0446 
Species (N)Strength–toughnessYield stress–initial stiffnessStrength–final stiffnessToughness–final stiffnessInitial stiffness–final stiffness
Atrina rigida (13) 0.793 0.649 –0.068 0.311 0.054 
Ctenoides mitis (18) 0.758 0.126 0.883 – – 
Geukensia demissa (19) 0.955 0.410 0.706 –0.551 0.514 
Modiolus modiolus (13) 0.855 0.620 –0.159 0.549 0.091 
Mytilus californianus (21) 0.982 0.579 0.756 –0.641 – 
Mytilus edulis (12) 0.952 – 0.769 –0.603 0.563 
P-values <0.0001 <0.0001 <0.0025 <0.0004 <0.0446 

Byssal thread strength and toughness were highly correlated(R>0.75) for all species. Yield stress was well correlated with initial stiffness in most cases. The final stiffness of A. rigida and M. modiolus threads tended not to share the correlations seen in threads of other species (entries in bold). Non-significant correlations are not shown

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