Table 2.

Dynamic material properties of silk spun by Argiope argentata and the western black widow Latrodectus hesperus

Loss tangent Storage modulus (GPa)
SilkInitialMaxFinalInitialAt max. loss tanFinalSource
Major ampullate (N=4, n=27)0.077±0.0030.172±0.0090.054±0.0026.2±0.37.8±0.240.4±0.9This study
    Latrodectus hesperus (n=12)0.063±0.0070.197±0.0090.075±0.0038.7±1.110.6±0.847.6±3.3(Blackledge et al., 2005c)
Tubuliform (N=1, n=6)0.031±0.0030.113±0.0100.068±0.0066.5±0.57.5±0.712.8±1.0This study
Minor ampullate (N=2, n=6)0.054±0.0090.160±0.0050.072±0.00110.5±0.610.0±0.848.0±2.2This study
Aciniform (N=1, n=2)0.043±0.0070.149±0.0210.023±0.01324.6±3.024.4±4.154.7±0.0This study
Capture spiral (N=1, n=6)0.057±0.01124.5±1.8This study
  • All values are mean ± s.e.m. For these data only, s.e.m. was calculated using the total number of fibers tested (n) as the sampling unit rather than individual spiders (N). —, data were not obtained.

    All silks are from Argiope argentata, except major ampullate silk from Latrodectus hesperus.