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±0.10a1.15±0.31a55±23a0.023±0.007a0.73±0.14a404±65a92±19a
Hyptiotes cavatus (N=3, n=22)0.51±0.01b,c7.04±0.37121±5a0.019±0.002a0.44±0.04a,b1439±15b206±13b
Hyptiotes gertschi (N=2, n=24)0.78±0.11a,c1.06±0.33a129±113a0.058±0.035a0.41±0.04a,b1171±227a,b120±17a,b
Uloborus diversus (N=11, n=81)0.40±0.02b1.05±0.33a39±4a0.026±0.001a0.32±0.01b1379±105b118±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.