花角蚜小蜂对松突圆蚧的寄生功能反应

在实验室条件下,以松突圆蚧(Hemiberlesia pitysophilaTakagi)雌成蚧为寄主,研究了花角蚜小蜂(Coccobius azumaiTachikawa)的寄生功能反应.结果表明:寄生功能反应均符合HollingⅡ型方程,且功能反应受到温度、寄主密度和寄生物密度的影响.在同一温度下,寄生数量随寄主密度的增大而增加;在15℃~25℃范围内,随着温度的升高,被寄生的松突圆蚧雌成蚧数量增加,而在25℃~35℃之间呈相反趋势.花角蚜小蜂的寄生功能反应有较强的种内干扰作用,随自身密度的增加,寄生数量逐渐减少.Hassell(1969)模型E=QP-m和Bedding-ton(1975)模型E=aT/1 btw(P-1)]均能较好地反映花角蚜小蜂的寻找效应与其自身密度之间的关系,模拟结果分别为E=0.1659P-0.5597和E=0.1437T/1 0.2691(P-1)].

Parasitic functional response of Coccobius azumai Tachikawa (Hymenoptera: Aphelinidae) to Hemiberlesia pitysophila Takagi (Homoptera: Diaspididae)

With female Hemiberlesia pitysophila adult as the host, this paper studied the parasitic functional response of Coccobius azumai in laboratory. The results showed that the response of C. azumai fitted Holling Type II equation, and was affected by temperature and the densities of host and parasitoid. At the same temperature, the number of parasitized host increased with increasing host density. At 15 degrees C-25 degrees C, the parasitized number increased with temperature; while at 25 degrees C-35 degrees C, it was in adverse. There was a stronger intraspecific interference in the parasitic functional response of C. azumai, i.e., the number of parasitized host decreased with increasing C. azumai density. The relationship between searching efficiency (E) of C. azumai and its density (P) could be well simulated as E = 0.1659P(-0.5597) by Hassell (1969) model E = QP(-m) and as E = 0.1437T/ 1 + 0.2691 (P -1)] by Beddington (1975) model E = aT/1 + bt(w) (P-1)].