西印度群岛特立尼达地区甘蔗小蛀虫Diatraea spp.及其初级和次级寄生蜂的种群周期

G. Hughes , P.S. Hammond , W.G. Des Vignes
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引用次数: 4

摘要

对三种甘蔗蛾(Diatraea spp.)的幼虫计数和克拉帕旁蛾(Paratheresia clarpalpis)和立方毛蛾(trichopia cubensis)的继发寄生程度进行了种群数据分析。对数据的时间序列分析显示,人口密度有两个规律周期,一个周期约为四个月,另一个周期约为一年。4个月的寄生周期在所有3种蝇类中都很明显,但有2种蝇类(糖化蝇和拟拟蝇)受寄生,而有1种蝇类(centrella)不受寄生。对Diatraea-Paratheresia-Trichopria相互作用的年循环分析表明,这些种群的密度在雨季增加,在旱季减少。通过时间序列分析,估计了寄主-寄生蜂相互作用响应和寄生蜂种群生长率对寄主种群密度变化的响应的时滞。这样就可以估计出拟寄生物的世代时间。这些估计已与从直接观测中收集的独立数据进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Population cycles of the small moth-borers of sugar cane, Diatraea spp., and their primary and secondary parasitoids, in Trinidad, West Indies

Population data consisting of counts of larvae of three species of sugar cane moth-borer, Diatraea spp., and assessments of the extent of parasitism by Paratheresia claripalpis and secondary parasitism by Trichopria cubensis, have been analysed. Time-series analysis of the data revealed two regular cycles in population density, one with a period of about four months, the other with a period of about one year.

The four month cycle was apparent in all three species of Diatraea, although two species, D. saccharalis and D. impersonatella, were subject to parasitism and one, D. centrella, was not. Analysis of the annual cycle of the Diatraea-Paratheresia-Trichopria interaction indicated that the densities of these populations increased during the rainy season and decreased during the dry season.

From the time-series analysis, estimates of time-lags in host-parasitoid interaction responses and in the responses of parasitoid populations' growth rates to changes in their host populations' densities were made. Estimates of parasitoids' generation times could then be derived. These estimates have been compared with independent data collected from direct observations.

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