The Behavior of Oviposition and Developmental Stages of Cybister sugillatus Erichson (Coleoptera: Dytiscidae).

• Main Authors: Yi-Tzai Lin, 林益在
• Other Authors: 楊平世
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/02302379782949487385

碩士 === 國立臺灣大學 === 昆蟲學研究所 === 93 === The behavior of oviposition, morphology and life history of Cybister sugillatus Erichson from Taiwan were studied. The females deposited 52.25 eggs in average in a copulation cycle. They reached the massovipositional phase in the third and fourth days after copulation, and laid 65.79% of the total number of eggs of a cycle. Females preferred to lay their eggs on clean plants than on egg-laid ones. It took 8.37 seconds in average to lay an egg in the massovipositional phase, and 17.81 seconds in the postovipositional phase. The development of Cybister sugillatus depended on various temperatures (16, 20, 24 and 28ºC). The developmental periods of egg, larvae and pupae at 28ºC required 13.16, 33.74, and 16.07 days in average respectively, which is the shortest among the four temperatures. The rates of hatching, pupation and emergence were also affected by temperatures. The threshold for development of egg, larval and pupal stages were 12.16, 10.59, and 11.44ºC, respectively. The total effective temperature required for these three stages were 204.66, 576.05, and 443.15 degree-days, and 1222.17 day-degrees to complete a life cycle. The survival rate for completing a life cycle was found highest as 53.68% at 24ºC, and lowest as 10.89% at 16ºC. The morphology of each developmental stage and the behaviors of courtship and copulation were also discussed.