Flight Activity and Sex Ratios of a Damselfly Platycnemis echigoana ASAHINA (Zygoptera Platycnemididae)

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Mark-and-recapture method was applied to a damselfly, Platycnemis echigoana, a rare species among the Platycnemididae in the cool temperate zone of Houshu, Japan. The peak activities of males were observed during 10 : 00-14 : 00, and those of females somewhat delayed. Tandems were also recognized during 11 : 00-14 : 00. Males defended a sunlit point, where the sunlight fell on the forest floor, by perching, and chasing conspecific males. Females encountered the male at the sunlit point, mated and then showed tandem behaviors. They oviposited into plant tissues on the water surface. The size of a mature egg was about 0.19 mm in diameter and 1.14 mm in length. A female seemed to have 250 mature eggs, and then laid about 170 eggs after a mating. A male showed strong residency perching at a sunlit point, while a female did not. Sexual differences in such behaviors were also reflected in the resident ratios.

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