Urban heat island conditions experienced by the Western black widow spider (Latrodectus hesperus): Extreme heat slows development but results in behavioral accommodations.

Looking at the effect of this temperature difference on early spiderling development to the 3 rd molt (see Fig 2 ), we found that family had a highly significant effect (F 33,1010 = 254, p<0.0001), UHI temperatures slowed development by 5 days (approximately 25% of the interval between molts 2 and 3; F 1,1010 = 40.4, p<0.0001), and there was no significant interaction between family and temperature (F 33,1010 = 1.15, p = 0.26).

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