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Table 1.

Mechanical properties of the core axial fibers of capture threads spun by three genera of cribellate spiders

SpeciesSingle axial fiber diameter (μm)Young's modulus (GPa)Stress at yield (MPa)Strain at yieldExtensibilityUltimate strength (MPa)Toughness (J m−3)
Deinopis spinosa (N=5, n=27) 1.03±0.10a 1.15±0.31a 55±23a 0.023±0.007a 0.73±0.14a 404±65a 92±19a 
Hyptiotes cavatus (N=3, n=22) 0.51±0.01b,c 7.04±0.37 121±5a 0.019±0.002a 0.44±0.04a,b 1439±15b 206±13b 
Hyptiotes gertschi (N=2, n=24) 0.78±0.11a,c 1.06±0.33a 129±113a 0.058±0.035a 0.41±0.04a,b 1171±227a,b 120±17a,b 
Uloborus diversus (N=11, n=81) 0.40±0.02b 1.05±0.33a 39±4a 0.026±0.001a 0.32±0.01b 1379±105b 118±11a,b 
SpeciesSingle axial fiber diameter (μm)Young's modulus (GPa)Stress at yield (MPa)Strain at yieldExtensibilityUltimate strength (MPa)Toughness (J m−3)
Deinopis spinosa (N=5, n=27) 1.03±0.10a 1.15±0.31a 55±23a 0.023±0.007a 0.73±0.14a 404±65a 92±19a 
Hyptiotes cavatus (N=3, n=22) 0.51±0.01b,c 7.04±0.37 121±5a 0.019±0.002a 0.44±0.04a,b 1439±15b 206±13b 
Hyptiotes gertschi (N=2, n=24) 0.78±0.11a,c 1.06±0.33a 129±113a 0.058±0.035a 0.41±0.04a,b 1171±227a,b 120±17a,b 
Uloborus diversus (N=11, n=81) 0.40±0.02b 1.05±0.33a 39±4a 0.026±0.001a 0.32±0.01b 1379±105b 118±11a,b 

All values are mean ± s.e.m.; N is the number of spiders for which silk was sampled. n is the total number of silk threads tested. s.e.m. was calculated using individual spiders (N) as the sampling unit.

Values that share superscripts within a column indicate lack of significant pairwise differences using Tukey's Honest Significant Difference tests at P<0.05.

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