3S techniques application on ant population survey and temperature factor to lethal assayof Solenopsis invicta

• Main Authors: Chih-Jay Hsu, 徐稚傑
• Other Authors: Mei-Hwa Kuo
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/17949518448854162568

碩士 === 國立中興大學 === 昆蟲學系所 === 96 === The red imported fire ant (Solenopsis invicta) has invaded Taiwan in 2003, and distributed at some areas in Hsinchu county. Utilizing 500m x 500m large area in this research to investigate ant population in Sinfong, Sinpu, and Guansi townships of Hsinchu county. The 3S techniques (GIS, RSS, GPS) were applied to select 983 sampling sites and investigated by GPS navigation. Fifteen ant genera were sampled, inclusive of three subfamilies, Formicinae, Myrmicinae, and Ponerinae. Ant forage activity is very active during March and October. Myrmicinae is the most dominate population among three subfamilies and occupied 87.7% of attracted tubes. Moreover, Pheidole is the most population among fifteen genera and occupied 45.57% of attracted tubes. There were 1061 numbers of S. invicta detected in s789 sampling site in Guansi township. There were 56 buffer areas divided in seven fire ant reported sites among three townships, and Pheidole was also the most dominate population in buffer areas. We also monitored ant population variation in Hesing village fire ant reported site, Monomorium and Pheidole ants emerged while S. invicta was extinct. Survivival days of S. invicta in room temperature was tested. S. invicta could survive about 35.25 ± 6.39 days added with 5μl water, while control was about 23 ± 4.76 days. Lethal temperature assay of S. invicta demonstrated that mortality increased as temperature rose. The mortality reached to 100% under 52 oC without water for 1 minute, while the mortality was beneath 50% under 46 oC for 10 minutes. Lethal time assay of S. invicta demonstrated that LT50 decreased as temperature rose. LT50 of 43 oC was 72.9 minutes, 44 oC was 38.1 minutes and 45oC was 11.6 minutes.