Barrantes Gilbert, Eberhard William G, Weng Ju-Lin
Escuela de Biología, Universidad de Costa Rica, San José, Costa Rica,
Rev Biol Trop. 2008 Jun;56(2):749-54.
The rates of parasitism of Theridion evexum by the parasitoid wasp Zatypota petronae, and Allocyclosa bifurca by Polysphincta gutfreundi, were followed for two years. Parasitism of T. evexum was very low (mean 1.39 +/- 1.8%), and restricted to nearly seven months of the year. Parasitism of A. bifurca was higher (mean 7.8 +/- 7.6%), and did not show a seasonal pattern. Reproduction of the host spider T evexum was highly seasonal, with only one, highly coordinated generation per year, while adults of A. bifurca were present year round. Short-term autocorrelation on parasitism rates over time at different sites suggest that P. gutfreundi tend to return to the same sites to hunt hosts over periods of a few weeks.
对寄生蜂Zatypota petronae寄生Evexum球蛛以及Polysphincta gutfreundi寄生Allocyclosa bifurca蜘蛛的发生率进行了为期两年的跟踪研究。Evexum球蛛的寄生率非常低（平均为1.39%±1.8%），且一年中仅有近七个月有寄生现象。Allocyclosa bifurca蜘蛛的寄生率较高（平均为7.8%±7.6%），且没有季节性模式。宿主蜘蛛Evexum球蛛的繁殖具有高度季节性，每年只有一代且高度同步，而Allocyclosa bifurca蜘蛛的成蛛全年都有。不同地点随时间推移的寄生率短期自相关表明，Polysphincta gutfreundi倾向于在几周的时间内返回同一地点捕食宿主。
