Study on the starvation endurance of the different instars of Tetragnatha nitens and Tetragnatha maxillosa
Author of the article:LUO Mao-Hai** LIU Yu-Di*** HOU Mao-Lin
Author's Workplace：State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection,Chinese Academy of Agricultural Sciences, Beijing 100193, China
Key Words：Tetragnatha nitens, Tetragnatha maxillosa, survival time, population survival rate, starvation endurance ability
Abstract： [Objectives] This study aimed to test the starvation endurance of different instars of Tetragnatha nitens and Tetragnatha maxillosa. [Methods] Three different instars of these spiders were kept without prey in a laboratory at25℃. Three treatment groups and three control groups for each instar were established according to mortality statistics recorded every three days. [Results] There was a marked correlation between larval weight and survival time of T. nitens and T. maxillosa and survival times of the three different instars were significantly different. The relationship between instar survival rate (y) and survival time (t) fitted a parabolic curve. The t50 and t95 starvation endurance thresholds for T. nitens were 22 and 32 days. The t50 and t95 starvation endurance thresholds for T. maxillosa were 20 and 28 days. [Conclusion] T. nitens and T. maxillosa can effectively survive a sudden drop in prey numbers in paddy fields following pesticide application or tilling.