oa African Entomology - The reproductive activity of two Pseudagrion species in the same habitat (Odonata: Coenagrionidae)



The reproductive activity of two closely related species, Pseudagrion massoicum Sjostedt and P. solisburyense Ris was examined relative to environmental factors. The abundance of both species was positively correlated, suggesting a weak influence of interspecific competition. The most important abiotic factor influencing the activity of the two species was cloud cover. Males of the two species showed a strong spatial separation in perching position relative to vegetation type, perch height and distance to the banks. The proportion of males actively engaged in reproduction rose significantly with time of day but was independent of total male density and the relative importance of either patrolling or perching behaviour. Males of both species were found to be non-territorial, which is exceptional for the genus Pseudagrion. This is discussed relative to high territory retention costs at high dragonfly densities.


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