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National Chung Hsing University Institutional Repository - NCHUIR > 農業暨自然資源學院 > 昆蟲學系 > 依資料類型分類 > 碩博士論文 >  蘇鐵白輪盾介殼蟲天敵Cybocephalus flavocapitis Smith之生命表與其於台灣之分布

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/153032

標題: 蘇鐵白輪盾介殼蟲天敵Cybocephalus flavocapitis Smith之生命表與其於台灣之分布
Temperature-dependent development and distribution of Cybocephalus flavocapitis Smith (Copeopetra: Cybocephalidae) predator of Aulacaspis yasumatsui Takagi(Hemiptera: Diaspididae) , in Taiwan
作者: 莎安娜
Samayoa, Ana
Contributors: 黃紹毅
Shaw-Yi Hwang
關鍵字: 蘇鐵屬;發育時間;有效積溫;發育臨界低溫;最大熵值;分布
Cycas;Development time;Degree-days;Thermal threshold;Maximum entropy;distribution
日期: 2012
Issue Date: 2013-11-18 11:47:23 (UTC+8)
Publisher: 昆蟲學系所
摘要: Cycas taitungensis Shen, Hill, Tsou & Chen (Cycadales: Cycadaceae) is an endangered species in Taiwan and it has been attacked by Aulacaspis yasumatsui Takagi (Hemiptera: Diaspididae), a mayor pest of Cycad plants. Its natural enemy, Cybocephalus flavocapitis Smith (Coleoptera: Cybocephalidae) development time was evaluated in this study, and egg duration, immature development time at five constant temperatures was also tested. Egg period ranged from 31 days at 15oC to 4 days at 35°C, no development was completed at 15 and 30°C. Immature development time ranges from 71 days at 20oC to 29 days at 30oC. Lower threshold temperature for all stages is between 11-15oC. For reach adulthood, 490 degree-days are necessary. Pre-pupae and pupae together are the longest period in which no predation occurs.
Occurrence data of C. flavocapitis and C. nipponicus at 34 localities were sampled in 10 counties across Taiwan. Five distribution maps were modeled using Maximum Entropy Modeling (Maxent). The number of C. flavocapitis collected is consistent with the Maxent model; Yilan and Kaohsiung are the counties with high percentage of better conditions and high number of beetles. Pingtung and Taichung counties have 57 - 91% of suitability and C. nipponicus was more abundant as well. The Taiwan Cycad Nature Reserve’s conditions are not favorable for C. nipponicus; the search of other control agents using predicting models, and evaluate the agent’s effectiveness must be done before the potential control agent is released.
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