橘园中重要天敌具瘤神蕊螨与其主要猎物的生态位

研究了柑橘园中具瘤神蕊螨(Agistemus exsertus)与其主要猎物柑橘皱叶刺瘿螨(Phyllocoptruta oleivora)、柑橘全爪螨(Panonychus citri)、柑橘粉虱(D ialeurodes citri)、黑刺粉虱(Aleurocanthus spiniferus)的生态位宽度、重叠和比例相似性。具瘤神蕊螨与其主要猎物相比,其时间和空间生态位宽度均最大,而其猎物中则以柑橘皱叶刺瘿螨的时间和空间生态位宽度最大,这表明具瘤神蕊螨和柑橘皱叶刺瘿螨的发生期较长,空间分布较广。具瘤神蕊螨与其猎物的生态位重叠在空间上与柑橘全爪螨的重叠值最大,在时间上与柑橘粉虱的重叠值最大。与其猎物相比,具瘤神蕊螨的时—空二维生态位宽度最大,在时空上占有明显的优势。

The niches of Agistemus exsertus and its primary preys in the citrus ecosystem

The niche breadth,overlap and proportion comparability of Agistemus exsertus Gouzalez and itsprimary preys,Phyllocoptruta oleivora (Ashmead),Panonychus citri(McGregor),Dialeurodes citri Ashmead and Aleurocanthus spiniferus(Quaintance),were studied in this paper.The spatial and temporal niche breadthes of A.exsertus were wider than those of its preys.The spatial and temporal niche breadthes of(P.oleivora) were wider than those of P.citri,D. citri and A.spiniferus.It was showed that A.exsertus and(P.oleivora) had longer(period) of occurrence and wider range of distribution.The value of spatial niche overlap of A.exsertus with P.citri was maximal and the value of temporal niche overlap of it with D.citri was the maximal.The value of spatial-temporal niche breadth of A.exsertus was higher than that of its preys.It meant that(A.exsertus) held distinct dominance in the space and time.