蚊幼对狼蛛的营养作用研究

研究蚊子幼虫（子孓）以拟水狼蛛（Ｐｉｒａｔａｓｕｂｐｉｒａｔｉｃｕｓ）的营养，繁殖作用，结果表明狼蛛对蚊幼的捕食符合ＨｏｌｌｉｎｇⅡ型功能反应，喂以蚊幼和不喂蚊幼处理狼蛛的体重增长率和生殖有极显著差异，在相同蚊幼密度下，狼蛛初始体重越小，增长率越大，经计算狼蛛每增重１ｍｇ，需消耗１０．５８ｍｇ蚊幼，这基本符合生态系统营养级能量流动的１／１０法则，狼蛛体重大小对褐飞虱的捕食量有明显差异，体重大的个体

A STUDY ON TROPHIC EFFECT OF NEUTRAL INSECT(WRIGGLER) FOR PIRATA SUBPIRATICUS

Mosquitoes (adults and larvae) and wolf spiders are representatives of dominantgroups for neutral insects and predators in arthropod community in the rice field, respectively.Trophic and reproductive effects of the wrigglers for wolf spider, Pirata subpiraticus werestudied in this paper The result showed that predation of the wolf spider for the wrigglers wascoincident with functional response of Holling II. There was a significant difference betweenfeeding on wrigglers and no feeding on increase rate of the wolf spider weight. Under the samewriggler density, the less initial weight of the spider was and the greater increase rate. Thespider increased 1 mg of weight and needed to consume about 10 mg of wrigglers by calcula-tion, that value approaches 1: 10 raw of energy flow between trophic hierarchy of ecosystem.Heavy wolf spider individuals consumed more brown planthoppers than little ones, the instan-taneous discovery rate of the former was greater than that of the later. Those results confirmedthat a great number of wrigglers during rice early stage, about 30 day after transplantation,supplied abundant trophic for growth and reproduction of predaceous natural enemies, andthen population construction of the predators played an important role of natural control ofplanthoppers in rice late stage.