de Andrade Juliana Bartholo, Rocha Fabrícia Aparecida, Rodrigues Patrícia, Rosa Gisele Souza, Faria Lucas Del Bianco, Von Zuben Cláudio José, Rossi Marcelo Nogueira, Godoy Wesley Augusto Conde
Departamento de Parasitologia, Instituto de Biociências, Universidade Estadual Paulista, 18618-000 Botucatu, SP, Brasil.
Mem Inst Oswaldo Cruz. 2002 Dec;97(8):1137-40. doi: 10.1590/s0074-02762002000800013. Epub 2003 Jan 20.
In this study we investigated the larval dispersal associated with larval predation in experimental populations of Chrysomya albiceps and Cochliomyia macellaria. Frequency distribution of sampling units (G test) in the substrate was used to evaluate variation in larval dispersal. An experimental acrylic channel (1 x 0.1 x 0.2 m) covered with wood shavings was used to observe larval dispersal prior to pupation. The acrylic channel was graduated at 0.05 m intervals, each representing a sampling unit; hence, 20 sampling units were set up. A Petri dish containing third instar larvae of single and double species was deposited at one edge of the acrylic channel allowing larvae to disperse. The number of buried pupae (0, 1, 2, n) present in each sampling unit was recorded. For double species, the number of recovered larvae of C. albiceps was similar to the number initially released on the dish Petri. On the other hand, the number of recovered larvae of C. macellaria was significantly smaller than the initially released number. The results show that C. albiceps attacks C. macellaria larvae during the larval dispersal process. The larval distribution of C. albiceps did not differ significantly from C. macellaria in double species, but it differed significantly in single species. The larval aggregation level of C. macellaria decreased when C. albiceps was present and the larval aggregation level of C. albiceps increased when C. macellaria was present. The implications of such findings for the population dynamics of these species are discussed.
在本研究中，我们调查了在白纹伊蚊和蛆症金蝇的实验种群中与幼虫捕食相关的幼虫扩散情况。利用基质中采样单位的频率分布（G检验）来评估幼虫扩散的变化。使用一个覆盖有木屑的实验性丙烯酸通道（1×0.1×0.2米）来观察化蛹前的幼虫扩散。丙烯酸通道以0.05米的间隔进行刻度划分，每个间隔代表一个采样单位；因此，设置了20个采样单位。将一个装有单物种和双物种三龄幼虫的培养皿放置在丙烯酸通道的一端，让幼虫扩散。记录每个采样单位中埋入的蛹的数量（0、1、2、n）。对于双物种，回收的白纹伊蚊幼虫数量与最初放在培养皿上的数量相似。另一方面，回收的蛆症金蝇幼虫数量明显少于最初释放的数量。结果表明，白纹伊蚊在幼虫扩散过程中攻击蛆症金蝇幼虫。在双物种中，白纹伊蚊的幼虫分布与蛆症金蝇没有显著差异，但在单物种中则有显著差异。当有白纹伊蚊存在时，蛆症金蝇的幼虫聚集水平下降，而当有蛆症金蝇存在时，白纹伊蚊的幼虫聚集水平上升。本文讨论了这些发现对这些物种种群动态的影响。
