Summary
The dragonfly nymph Mesogomphus lineatus satiated predating 21 larvae of Culex fatigans in 50 minutes; number of attack and predatory efficiency decreased precipitously from 2 attacks/min and 70% during the first 10 minutes of feeding to 0.04 attack/min and 0.01% efficiency respectively during the sixth 10 minutes interval. The nymphs fed after 6, 12, 18, 24, 36 or 42 hours of deprivation consumed 4, 13, 15, 20, 21 or 21 larvae; apparently, the maximum appetite is returned after about 36 hours of deprivation. Satiation time, which was 50 minutes at the density of 15 larvae/aquarium, decreased to 30 minutes in aquaria containing 200 larvae. The nymphs predated increased the number of prey when they were exposed to higher densities of C. fatigans and Anopheles stephansi larvae, and pupa of C. fatigans. They consumed equal weight (but different number) of Culex and Anopheles larvae at all the tested prey densities and selectively selected Culex larva over the pupa or Anopheles larva. Comparative analyses suggest that the dragonfly nymphs deserve serious consideration as larvivorous predators.
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Mathavan, S. Satiation time and predatory behaviour of the dragonfly nymph Mesogomphus lineatus. Hydrobiologia 50, 55–64 (1976). https://doi.org/10.1007/BF00016841
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DOI: https://doi.org/10.1007/BF00016841