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|標題:||捕食者-食餌關係：溫氏捕植滿(Amblyseius womersleyi Schicha)對二點葉滿(Tetranychus urticae Koch)(Acarina：Phytoseiidae;Tetranychidae)不同齡別、食餌量及給餌時間間隔之數量反應
Predator-prey interaction:Numerical responses of Amblyseius womersleyi Schicha on different stages, quantities and feeding intervals of Tetranychus urticae Koch(Acarina:Phytoseiidae;Tetranychidae)
Feeding with different stages combinations (eggs ─ larvae and adnits ─ nymphs), different prey-volume (0.02g, 0.01g and 0.05g) of Tetranychus urticae at different feeding intervals (1, 2 and 4 days), I tested the variations of predator density, age structure, sex ratio and population increase of Amblyseius womersleyi on a 15 x 5 x 0.05 cm PE-tilt arena. The predatory populations daily fed with 0.01 gm and 0.005 gm of T. urticae eggs ─ larvae increased to higher density level than those fed on the same volume and feeding interval but not those fed on different food resources of adults ─ nymphs. The higher the prey volume supplied the higher the predatory population density reached. The utilization rate of predators on conversion of food resources to population growth were found high in low food volume supplied plots (0.005g per day per arena). A high predatory population density was demonstrated in the daily 0.01g of T. urticae eggs and larvae supplied plots which was higher than those with same food supply but with 2 or 4 days feeding intervals. A higher population increase rate and longer duration of the higher density level of predators were also found in daily 0.01 gm food supply. Whenever the higher frequency of adult among all the stage groups of predatory populations was found; A. womersleyi demonstrated to be a senescent population, the population was inclined to be a decrement phase afterward (χ2=7.76, p>0.05 ). With Chi-square test, I could not prove the incremental and decrement phase of population growth associated with the female sex ratio in A. womersleyi population. In order to mass rear A. womersleyi with PE-tilt arena I evaluated the better rearing methods for predator from higher density, higher increase rate, longer duration of the highest density, a higher total population numbers, and a higher rate of prey utility- efficiency. I found that daily 0.005g and 0.01g of T. urticae eggs and larvae was the best among all tested food-supply volumes, feeding interval and prey stages. When the predatory population was daily fed with 0.01g of eggs and larvae of T. urticae, the population would increase at a higher rate and reach a higher density level on PE-tilt arena. However, the predators would decrease to lower density level after 23 days of rearing which demonstrated that population fed with 0.01g was less stable than that fed on 0.005g. The sigmoid and modified sigmoid regression analyses were better fitted for the predator population on rearing duration than those with linear and disc equation models, in terms of goodness of fit. The regression equation showed the same results as fore interpretations. However, the estimated highest density of predator (800 mites/arena) from the regression is lower than that of real obsessed, the population increase rate is lower and duration of the high density reached is extended, too.
以二點葉滿(Tetranychus urticae)不同齡期(卵─幼滿，若滿─成滿)、不同食餌餵食量(0.02g，0.01g，0.005g)及不同餵食間隔(每天、每兩天、每四天)分別飼育溫氏捕植滿(Amblyseius womersleyi)，觀察捕植滿族群數童、齡期比例、性比之變化情形。每天餵食二點葉滿卵─幼滿(0.01g及0.005g)之捕植滿族群總滿數比每天餵食二點葉滿若滿─成滿(0.01g及0.005g)高。食餌餵食量愈高可達到較高之族群總滿數，但餵食量較少之處理度食餌之利用率較高。每天、每兩天及每四天分別餵食二點葉滿卵─幼滿0.01lg，以每天餵食之捕植滿族群總滿數最高，每四天餵食一次之處理組為最低，並且其族群增殖率亦以每日餵食者為最高，最高族群密度維持時間亦最長及穩定(χ2=9.76, p>0.05)。捕植滿族群中成滿期佔全部齡其之頻度值為最大時，為老化之族群，之後族群數量則顯著逐漸減少。捕植滿族群中性比大於0.5時族群總滿數仍會上昇，性比小於0.5時，則族群總數呈顯著下降趨勢。
|Appears in Collections:||昆蟲學系|
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