Odonatological Abstracts

(15517) GOHLERT, T, 1996. Bemerkenswerte faunistische Nachweise in der Radeburger Heide. Veroff. Mas. WLausilz Kamenz 19: 89-90. — (Schweriner Str. 30, D-01067 Dresden). Lestes barbarus and Orthetrum coerulescens are listed from the locality nr Grossdiltmansdorf, Saxony, E Germany. (15518) ROLFF, J., 1996. Experimented Untersuchungen zum Wirt-Parasit-System Coenagrion puella (L.) (Odonata: Coenagrionidae) Arrenurus spp. (Acari: Arrenuridae). DiplArb. Zool. Inst., Tech. Univ. Braunschweig. 95 pp., 3 graphs excl. – (Dept Anim. & Plant Biol., Univ. Sheffield, Sheffield, S10 2TN, UK). The study was conducted at Eckemkemp (Rieseberg, distr. Fleimstedt, Germany) in May and July 1995. It is shown that the ectoparasitic A. cuspidator mites return to water at the moment of C. puella oviposition. The infestation of the dragonfly by the mite was monitored throughout the emergence period. On 3 (out of 18) days, the $ $ were significantly more parasitised than 3 6. Based on the intensity of ectoparasite infestation, its influence on the dragonfly population dynamics is assessed. With the data gathered, a simple model could be constructed that simulates the success of the return of mites to the reproduction habitat, depending on the life history of the host.