Conservation biology of the giant water bug (Kirkaldyia deyrollei (Vuillefroy), Hemiptera: Belostomatidae)
Date Issued
2015
Date
2015
Author(s)
Teng, Yih-Harn
Abstract
The giant water bug, kirkaldyia deyrollei is a gradually endangered aquatic insect thought out the East Asia. They are known for its brood - caring behavior and the infanticide behavior of the female. Ecological studies in Japan and Korea showed they are univoltine species and their food habit mainly depend on frog populations in traditional paddy fields. In order to know the biology information of the giant water bug, we examined their life cycle under 15℃,18℃,20℃,23℃,25℃,28℃,30℃,33℃ and 35℃ in laboratory. The results showed nymphs development cannot successfully in 15℃ and 35℃. The average egg stage is 7.1 ± 1.52 days and nymph stage show that the development rate increases with rising temperature between 18℃ - 33℃. In 18℃(male only),20℃,23℃,25℃,28℃,30℃,33℃, the nymphal stage was 119.5, 67.29, 51.06, 42.58, 40.32, 35.79, 33.26 days respectively. The developmental threshold of the nymphal stage from 1st instar to 5th instar was 6.27, 6.27, 4.74, -1.66, 9.26, 6.27℃. The thermal summation was 911.17 DD. Experimental results show that the nymphal stage was 35.79 days in 30℃, we were wondering why the giant water bug is only one generation in a year. So we focus on the reproduction impact of light length, water temperature and overwintering behavior. We found that the reproduction behavior mainly depends on water temperature, light length and overwintering behavior is not necessary for the reproduction success of k. deyrollei. The criteria degree of conservation was also evaluated for the giant water bug, the result indicated the evaluated credit fitted to suggest as an endangered species of animals in Taiwan.
Subjects
kirkaldyia deyrollei Vuillefroy
life history
total effective temperature.
Type
thesis
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