Oviposition behaviour of Sympetrum frequens (Selys) (Odonata: Libellulidae)

Oviposition behaviour by Sympetrum frequens, a species endemic to Japan, has been observed throughout its entire breeding season, which extended for about one month after the harvest of rice. Approximately 50% of oviposition events occurred during the first week of the reproduction period. Sunny oviposition sites were preferentially selected by ovipositing pairs. The starting time…

Ovipositor morphology and egg laying behaviour in the dragonfly Lestes macrostigma (Zygoptera: Lestidae)

Lestes macrostigma is a stenotopic dragonfly species of Western Palaearctic distribution that has high conservation status almost throughout its range. It inhabits mainly brackish water with a typical plant species, sea club-rush Bolboschoenus maritimus. Due to the absence of special investigations, the nature of this insect–plant association is not clearly understood, but it was supposed…

Parthenogenetic Ischnura hastata revisited: present status and notes on population ecology and behaviour (Odonata: Coenagrionidae)

Populations of Ischnura hastata found in the Azores archipelago represent the only known example of parthenogenesis in the order Odonata. In this paper, we present results from fieldwork done on the islands of São Miguel, Pico, Santa Maria, and Graciosa, aimed at characterizing population ecology and habitat preferences of this species. Sampling of several ponds…

Taxonomy, behaviour, and habitat of Mesopodagrion and Sinocnemis. Notes on Old World Megapodagrionidae 3 (Odonata)

Published records of Mesopodagrion are reviewed and the distributions of M. tibetanum and M. yachowensis are given. Sinocnemis henanese is considered a junior synonym of S. yangbingi. Based on morphological and behavioural characters Sinocnemis is removed from Platycnemididae and placed in Megapodagrionidae. Species of Sinocnemis show a general resemblance to species of Mesopodagrion but it…

Reproductive behaviour of Neurobasis kaupi (Odonata: Calopterygidae)

The reproductive behaviour of Neurobasis kaupi was studied for the first time in Central and South Sulawesi. The species was recorded in a wide variety of clear and fast flowing creeks, streams and rivers, mostly in forested areas. The males were territorial and defended potential oviposition sites, a limited resource. Territory owners demonstrated their presence…

Effects of male harassment on females’ oviposition behaviour in Libellulidae (Odonata)

I investigated whether the level of male harassment affects females’ oviposition behaviour, such that females oviposit unguarded under suboptimal conditions and/or vary oviposition duration, dip number, dip frequency or number of oviposition site changes. The study species were the libellulids Crocothemis erythraea, Ortbetrum chrysostigma, Pantala flavescens, Sympetrum fonscolombii, Trithemis annulata and T. kirbyi ardens. Only…