蒙古花蟹蛛生物学特性及对棉铃虫幼虫捕食作用的初步研究

BIOLOGICAL CHARACTERISTICS OF Xysticus mongolicus AND ITS PREDATION EFFICACY

蒙古花蟹蛛在乌鲁木齐和玛纳斯一年发生一代,以初龄幼蛛越冬,3月底4月初出蛰,8月中旬始见成蛛雌雄比约1∶0.87。交配大都在白天,可多次交配。抗逆性极强,三龄幼蛛耐饥、渴可达80天。在棉田其发生(?)与棉铃虫明显相关,r=0.7969。捕食棉铃虫幼虫的功能反应属Holling Ⅱ型,其捕食率随自身密度的增大而(?)小,m=0.5949。

X. mongolicus appears one generation a year in Urumqi and Manasi. Observations showed that mongolicus overwinters as early instar spiderling from mid October to late March or early April, and adult Spiders have a sex ratio of 1: 0.87 (female: male). Mating behavior usually occurs in day—time. In the absence of food and water, the spiderlings of 3rd—instar could support their life 80 days, but couldn't complete their physical development, and their body sizes were shorter than normal. It has a habit of roving about as a predater and can prey on many kinds of pests. The seasonal fluctuation of Ⅹ. mongolicus population in cotton fields was found to be correlation with that of cotton bollwarm, r=0.7969. The functional response of Ⅹ. mongolicus to cotton bollwarm were determined as Holling's type Ⅱ in the experimental condition. Its efficiency of prey was decreased with its own density, m=0.5949.