Abstract
We studied aggregation of nymphs of the cockroach Leucophaea maderae . Sibling nymphs were found to cluster together more frequently than nonsibling nymphs. The tendency to associate with siblings is strongest in first-instar nymphs, begins to disappear in the molt period, and is absent in second-instar nymphs. This observation is consistent with previous reports of nymphs clustering around or being attracted to their mother in preference to other conspecific adult females. Association with the mother or with sibling nymphs may confer advantages in protection or passage of intestinal symbionts. We also present an alternative method to nearest neighbor techniques for determining the randomness of spatial patterns.
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