Effect of immersion in water on egg survival in the grasshopper Fruhstorferiol a tonkinensis
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Key Words:Fruhstorferiola tonkinensis, egg, diapause, water immersion
Abstract: Fruhstorferiola tonkinensis Will.(Orthoptera: Catantopidae) is a dominant gr asshopper species along Beijiang River bank, Guangdong, China. Influences of sim ulated flooding on F. tonkinensis eggs were investigated. Eggs in diapause w ere immersed in water for 5 to 95 days, and eggs in embryonic developmental stage we re treated for 1 to 30 days. Hatching success decreased and incubation time incr eased with the duration of immersion increased. After immersed 30 days, all eggs in embryonic developmental stage died. The survival rate of diapause eggs treat ed 95 days was still 8。01%. It indicated that there was higher immersionresis ta nt in diapause eggs than those in embryonic developmental stage. It implied that egg diapause of F. tonkinensis is one of the adaptation strategies to the a dverse conditions in its lifecycle.