Räumliche und Zeitliche Aufteilung des Paarungsplatzes bei Großlibellen (Odonata, Anisoptera)

Abstract

Adult dragonflies visit ponds and rivers only for mating and for oviposition. Oviposition sites serve as mating places. The male dragonflies of a population partition their presence at the mating place either spatially or temporally. Inthe former case the males perch at the bank and stay there for longer visits (e.g. Onychogomphus forcipatus , Fig. 1). In the latter case the males keep on the wing all day long and pay successive short visits to the mating place relieving one another (e.g. Aeschna juncea, Fig. 2). Some Libellulid species have additionally an individual site tenacity and therefore territorial behaviour. In Aeschnids the intermale aggressiveness causes a reduction of visit length in crowded situations resulting in a regulation of mean density at the mating place (Fig. 4).

Mit Unterstützung durch die Deutsche Forschungsgemeinschaft