チャバネゴキブリBlattella germanica成虫の潜伏習性について(2)

概要

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The harbouring hehaviour of adult German cockroaches was experimentally studied using two slit shelters vertically stood in each test container. The utilizable inner space of each shelter was 10×10×0.5cm. When 22 or 28 adults were released in one container, ungravid females splited into two shelters, in the same way as males did in previous experiments. The value of nearest neighbour distance (NND: in mm), however, was smaller, and the highest peak in the distribution of NND was not so clear as that of males. When the same number of males and ungravid females were mixed in a container, they also went into two shelters, even though the minimum group size of 16 cockroaches were used. When gravid females, ungravid females, and males were mixed, the mixed population splited into two shelters. However, the number of cockroaches in one of the two shelters swelled with greater aggregation, and that in another did not though the number of tested insects was increased.
1995-10-31