Survival rates, site fidelity and homing ability in territorial Calopteryx haemorrhoidalis (Vander Linden) (Zygoptera: Calopterygidae)

In a small isolated population along a small stream in NE Spain, a high proportion of the adults present were individually marked. During subsequent days, their locations were assessed by twice-daily surveys along the entire length of the stream. Mean daily survival rates in mature <J 3 and 2 2 and pre-reproductive 3 6 were similar, 94%. Only during the first day after marking were survival rates significantly lower (viz. 77 to 84% in the various groups). High proportions (around 90%) of mature 3 3 were found to return to the same (territory) site every morning once they had occupied that site for 2 or more days. Site fidelity was low in pre-reproductive 3 3 and intermediate in mature 2 2. In a displacement experiment, 67 territorial 3 3 were transferred one by one to distant locations (80 to 240 m along the stream). Half of them returned to their original territory, usually on the same day.