Abstract
Habitat utilization patterns were studied in damselfly males,Mnais pruinosa, which have two male forms with different reproductive behaviors. The ‘esakii’ (orange-winged males) were territorial around oviposition sites, while the ‘strigata’ (hyaline-winged males) were non-territorial, often sneaking into theesakii's territory or loitering on the foliage of vegetation along stream banks. The place in the stream in the study area where females frequently appeared was covered by reeds and had abundant oviposition sites. It was difficult for the territorialesakii to stay there because the crowded reeds prevented them from defending their territory and discovering the females. Furthermore, there was competition for the limited territorial space with another species,Mnais nawai. Strigata males concentrated in this place in direct proportion to the number of females. Females frequently mated withstrigata males and probably deposited eggs fertilized bystrigata sperm rather thanesakii sperm. The density ofstrigata was higher than that ofesakii in this study area. If the average reproductive success ofesakii andstrigata males is equal, this may indicate that the equilibrious point between the two male forms is biased towardstrigata.
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Nomakuchi, S. Male reproductive polymorphism and form-specific habitat utilization of the damselflyMnais pruinosa (Zygoptera: Calopterygidae). Ecol. Res. 7, 87–96 (1992). https://doi.org/10.1007/BF02348487
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DOI: https://doi.org/10.1007/BF02348487