关键词: 异色瓢虫, 白毛蚜, 功能反应, 寻找效应

Abstract: Laboratory studies show that the functional responses of 1-4 instar larvae andadult of Leis axyrtdis to wingless adult aphids Chaitophorus populialbae belong to Holling II type. The relationship between searching efficiency (E) and the adult ladybird density (P) is described by Hassell & Varley's model E=Qp^-m and Bed-dington's model E=aT/[1+bt_w(P-1)] as E=0.4286P^-0.6555 and E=0.4108/(0.6288+0.3712P), respectively. Both models demonstrate that the searching efficiency declines with increase of the ladybird density, but Beddington's model can describe the relationship better than Hassell & Varley's model. The relationship between searching efficiency (E) and the prey density (N) and the adult ladybird density (P) is described by Beddington's model E=aT/[1+at_kN+bt_w(p-1)]as E=0.4108/(0.6288+0.002846N+0.3712P), I.e. the searching efficiency declineswhen the adult ladybird and the prey densities increase.

Key words: Leis axyridis——Chaitophorus populialbae——functional response ——searching efficiency