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Predation of Enallagma cyathigerum by an adult Cicindela hybrida (Odonata: Aeshnidae; Coleoptera: Carabidae) – On 26 July 2014 near Nuremberg, Germany, an adult Northern Dune Tiger Beetle Cicindela hybrida was observed capturing a mature male Enallagma cyathigerum and photographed devouring the prey. In contrast to Cicindela larvae adult beetles have not been recorded as predators of Odonata until now.
Reciprocal predation of dragonflies and grasshoppers (Odonata, Saltatoria) — On 14-VI-1998 a nearly full-grown larva of Tettigonia viridissima was observed catching a flying male Calopteryx splendens, and on 12-VI-2005 a male Ischnura elegans was photographed devouring a young larva of Phaneroptera falcata. The hitherto available records of corresponding predation events available to us are compiled and the nutritional interrelation between Odonata and Saltatoria (Ensifera, Caelifera) is discussed.
1998 •
23 tiger beetle species are reported from the study area covering approx. 10 km2. Cylindera lutaria, Habrodera nilotica, Lophyridia fimbriata and Myriochile flavidens are recorded for the first time from the Ivory Coast. Euryarthron planatoflavum is recorded for the first time from Upper Volta. One new species (Dromicoida elegantia) was discovered (Werner 1995). The study site supports a species-rich tiger beetle fauna, which is caused by a highly diverse habitat mosaic. Only very few species are restricted to the Ivory Coast and adjacent countries, many reach as far as Central or East Africa. Possible explanations for this pattern are discussed. Tiger beetles are members of a carnivorous arthropod guild, which hunt at very high temperatures. Because of the extreme environmental conditions there are very few competitors. Moreover, tiger beetles seem to compete mostly with sympatric congeners because of very similar life histories. The specific habitat preferences of each species are analysed and the Hutchinsonian ratios of sympatric tiger beetles in respect to mandible length compared. It is shown that species which occur in the same habitat and exhibit a similar behaviour generally follow the predicted character divergence. In contrast, sympatric species with different micro-habitat preferences show only minor divergence. These results are discussed as a response to reduce competition.
2006 •
The beginnings of Odonata studies in Wurttemberg, Germany — Literature investigations and a check of the collection of the ‘Staatliches Museum für Naturkunde Stuttgart’ (SMNS) revealed a number of early Odonata records from Wurttemberg that had been hitherto unknown or neglected. As the oldest faunistic work from this region, the 1802 publication of «Verzeichniss der Halbkaefer, Netzflügler, Wespen, ungeflügelten Insekten, Wanzen und Fliegen, welche um den Ursprung der Donau und des Nekars, dann um den untern Theil des Bodensees vorkommen» by the naturalist Friedrich Roth von Schreckenstein, was identified. Considering several other newly evaluated historic publications, such as the‚ ‘Oberamtsbeschreibungen’ or the ‘Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg‘ (1844-1900), the first steps of odonatology in the 19th century in Wurttemberg are documented. Apart from describing the start of Odonata species listing from Wurttemberg, hitherto neglected data concerning species that today are regarded as rare or extinct – Leucorrhinia albifrons and L. caudalis – are presented.
Kurzfassung In den Jahren 2008-2013 wurden an 13 ausgewählten Gewässern innerhalb des Stadtgebietes von Mainz Libellen kartiert. Es konnten 44 Libellenarten nachgewiesen werden, was einem Anteil von 66 % der in Rheinland-Pfalz vorkommenden 67 Arten entspricht. Chalcolestes viridis, Coenagrion puella, und Sympetrum striolatum erreichten eine Stetigkeit von über 90 %, S. sanguineum sogar von 100 %. Im Vergleich zu publizierten Daten aus 2006/07 kamen im Stadtgebiet von Mainz vier bodenständige Arten hinzu: Coenagrion scitulum, Erythromma lindenii, Lestes virens und Brachytron pratense. Als weitere Gäste konnten E. najas, Anax parthenope und Leucorrhinia pectoralis beobachtet werden. Aktuell konnten Orthetrum brunneum und Ophiogomphus cecilia nicht nachgewiesen werden. Die Zunahme der Artenzahl steht vermutlich mit aktuell klimabedingt stattfindenden Arealverschiebungen der Libellenfauna im Zusammenhang. Bemerkenswert ist jedoch, dass sowohl höhere Artenzahlen als auch höhere Stetigkei...
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