Study On Bio-ecology Of The Two Dominant Spiders: Neoscona Scylla And Clubiona Corrugate

1. Study on bio-ecology of the spider Neoscona ScyllaThe bio-ecology of the spider Neoscona scylla were studied by field and laboratory observation. In the experiment, as expected, the spider overwintered with spiderlings, sub-adults and adults, and their distribution pattern belongs to aggegration. It had 3-4generations each year in region of Hunan province. The duration of the 4th generation was the longest, and that of 2nd and 3r generation was the shortest. Observed by the author, the spider usually is a weaving-net Female and male mated several times, and one female can lay 12 egg-sacs at the most and the number of eggs per egg-sac was 82.2 on an average. As expected, the hatched spiderlings made their way safely to the mother's back in aggregation mode. The spiderling stage was 40-120d. The adult period was 33-176d. The sex ratios of female to male were smaller than one in all generations except the second. The courtship and mating behaviors of the adult spiders and characteristics of the instars and sub-adult spiders are described in detail in this paper. Its starvation capability is stronger that dry capability in the laboratory.2. Study on bio-ecology of the spider Clubiona corrugataThis article dealed with the life history, reproduction, development and behavior of Clubiona corrugate in detail in Hunan province, China. Bio-ecology of Clubiona corrugate was studied under room temperature. They were reared with adults of Nilaparvata lugens serving as prey through their life cycle. In Hunan, the sec spider Clubiona corrugate has two or three generations each year. Both female and male mate several times, without cannibalistic behavior. One female lays 5-7 egg sacs and a mean of 371.5 eggs throughout its adult life. The spiderling required a mean of 158.2 days after hatching to reach maturity, became adults following 6-8 molts, and lived for an averge of 223.2 days as adults.