Habitat selection in the larvae of two species of Zygoptera (Odonata): biotic interactions and abiotic limitation

摘要: Field and laboratory experiments were set up to obtain data on the reasons for different habitat selection of Enallagma cyathigerum Platycnemis pennipes. (1) Rearing larvae in two ponds showed that while P. pennipes was not able survive conditions low oxygen content, 50% E. survived. (2) In field predation with sticklebacks dragonflies as predators, we found suffered highest by fish. pennipes, mortality Anax imperator. (3) Experiments regarding larval behaviour generally more active had higher foraging success than Both species reduced activity presence fish, but did so a minor extent. contrast escaping behaviour. (4) laboratory, growth faster