Studies on Biology of Laccoterphes grossus and Laccoterphes robustus
| Autor: | Sing-yu lin, 林幸鈺 |
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| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 The development of Laccotrephes grossus were studied at 15℃, 20℃, 25℃, and 30℃. The developmental rate increased as the temperatures rose. All eggs failed to hatch at 15℃. The longest egg stage was found under 20℃, 32 days, and the shortest under 30℃, 12.12 days. The nymphal stages could not to finish at 20℃. The longest nymphal stages was found under 25℃, 76.65 days, and the shortest under 30℃, 45.53 days. The developmental threshold of the egg stage was 8℃ and the thermal summation was 266.6 DD. The developmental threshold of the nymphal stages was 17.08℃ and the thermal summation was 599.66 DD. The development of Laccotrephes robustus were studied at 15℃, 20℃, 25℃, and 30℃. The developmental rate increased as the temperatures rose. The longest egg stage was found under 15℃, 54.94 days, and the shortest under 30℃, 13.42 days. The nymphal stages could not to finish at 15℃. The longest nymphal stages was found under 20℃, 96.03 days, and the shortest under 30℃, 50.26 days. The developmental threshold of the egg stage was 10.47℃ and the thermal summation was 259.81 DD. The developmental threshold of the nymphal stages was 8.7℃ and the thermal summation was 1052.61 DD. The prey consumption of nymphal and adult stages increased along with the increasing prey density at 30 ℃. The percentages of preys killed by the nymphs of L. grossus per day were 100、100、100、58.20及91.17 % at prey density 48.35、46.24、51.04、15.67及23.33 % at prey density I~Ⅵ, respectively. According to the analysis, it is recognized as type II functional response. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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