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The Functional Response and Fecundity of Delphastus catalinae (Coleoptera: Coccinellidae) Feeding on Bemisia argentifolii
小黑粉蝨瓢蟲（Delphastus catalinae）（以下簡稱瓢蟲）為輸入之捕食性瓢蟲，捕食在台灣屬重要經濟害蟲之銀葉粉蝨（Bemisia argentifolii）。在實驗室中，研究瓢蟲捕食銀葉粉蝨卵之功能反應及產卵數量。在定溫28℃，溼度70〜80％，14L:10D，瓢蟲一至四齡幼蟲和雌雄成蟲，以及在五種定溫（16℃∼32℃）下，雌成蟲對不同密度銀葉粉蝨卵之捕食量，均隨銀葉粉蝨卵密度之增加而上升。瓢蟲對不同密度銀葉粉蝨卵之功能反應，均符合圓盤型或S型模式。依所獲S型方程式換算瓢蟲一至四齡幼蟲和雌雄成蟲之處理食餌時間（Th）及每日最大捕食量(Nmax)，其處理食餌時間（Th）以一齡幼蟲最長(0.0126)，雌成蟲最短(0.0063)；每日最大捕食量以一齡幼蟲最少 (79粒銀葉粉蝨卵/天)，雌成蟲最多(159粒銀葉粉蝨卵/天)。而在五種不同定溫（16、20、24、28及32℃）下，瓢蟲雌成蟲之攻擊成功率(a)隨著溫度之升高而上升（0.0229、0.0230、0.0243、0.0276及0.0287）。已交尾瓢蟲雌成蟲，必須捕食銀葉粉蝨卵才會產卵。瓢蟲雌成蟲之產卵量隨銀葉粉蝨卵密度(50、100、150、200、250、300及450粒銀葉粉蝨卵/天)增高而上升。每日供飼粉蝨卵密度達200∼300粒/天及連續供餌三天時，瓢蟲雌成蟲之產卵量可達1.1∼2.4粒卵/天。每日飼育500粒銀葉粉蝨卵，不同密度瓢蟲雌成蟲（1、2及3隻雌成蟲/500粒卵）之產卵數量隨瓢蟲密度之增加而減少，單隻瓢蟲在試驗第3∼7天，其產卵量達到穩定數量（3.1∼3.8粒卵/天）。
Delphastus catalinae is an imported predator for controlling of B. argentifolii, an economically important pest in Taiwan. The functional response and fecundity of D. catalinae feeding on eggs of B. argentifolii were assessed under 28℃, 7 0∼80％RH, 14L:10D. The daily predation rate of 1st to 4th instar larvae, female and male adults of D. catalinae increased with increasing density of B. argentifolii eggs. At five different temperature regimes, the predation rate of female D. catalinae also increased with increasing density of B. argentifolii eggs. Results of the functional response experiments showed that the relationships between the predation of both larval and adult stages of D. catalinae and the egg density of B. argentifolii under different laboratory conditions fit the disc and sigmoid equation model. Non-linear regression model was used to fit the sigmoid equation model to determine the theoretical attack rate (a) and handling time (Th) under various laboratory conditions. At 28℃, 1st instar D. catalinae exhibited higher attack rate (0.0126) than female adults (0.0063), and the theoretical maximum predation rate of 1st instar (79 B. argentifolii eggs/day) is less than that of female adults (159 B. argentifolii eggs/day). Among five different temperatures, attack rate of mated female D. catalinae increased with increase of temperature (0.0229, 0.0230, 0.0243, 0.0276 and 0.0287). In addition, results of the fecundity experiments revealed that mated female D. catalinae laid eggs only when reared on eggs of B. argentifolii. The numbers of eggs laid by mated female D. catalinae increased with the increase of the number of B. argentifolii eggs provided. Since the third day, when the density of B. argentifolii eggs is between 200 and 300, the numbers of eggs laid by mated female D. catalinae were between 1.1∼2.4/day. However obtain the number of B. argentifolii eggs offered reached 500, the number of eggs laid by mated female D. catalinae decreased with the increase of the density of D. catalinae. On the 3rd to 7th day of the experiment, the number of eggs laid by individual mated female D. catalinae reached its maximal, stable amount.
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