Uherkovich Ákos: A Dráva mente állatvilága II. (Dunántúli Dolgozatok Természettudományi Sorozat 9., 1998)

Nógrádi S. Uherkovich Á.: Újabb eredmények a Duna-Dráva Nemzeti Park Dráva menti területei tegzes (Trichoptera) faunájának kutatásában. - Further results of the study on the caddisflies (Trichoptera) of Dráva river and environments in the Duna-Dráva National Park, Southwest Hungary

358 DUNÁNTÚLI DOLGOZATOK (A) TERMÉSZETTUDOMÁNYI SOROZAT 9. (1998) adult in the North Borsod Karst (Jósvafő), but this data had been unpublished until recent days. The most interesting result of this decade was to find Helicopsyche bacescui Orghidan & Botosäneanu along the Dráva river. In small spring moors, nearby Somogyudvarhely several specimens (mostly males) were swept daytime by ourselves. The species described from Romania has small and isolated population in Romania and Bulgaria. Its nearest known population lies in Southern Banat (Romania), 800 km away from this newly discovered site. Further nine species that had not been known earlier were pointed out (NÓGRÁDI, UHERKOVICH 1995) from the area examined: Oligostomis reticulata (L.), Limnephilus binotatus Curt., Potamophylax luctuosus (Piller & Mitterp.), Lithax obscurus (Hag.), Triaenodes simulans Tjeder, Adicella balcanica Bots. & Novak, Notidobia ciliaris (L.). Beraea pullata (Curt.) and Ernodes articularis (Pict.). Some of them are rarities all over Hungary, while others have many distribution data. As it is already well-known, single and ultimate world population of Platyphylax frauenfeldi also breeds in the Dráva River. We have published about its distribution, activity and habitats earlier. By today altogether 107 caddisfly species are known from the Dráva Region of Duna-Dráva National Park. We studied some characteristic habitats of caddisflies and we analyze thier caddisfly communities or stands. The most important habitats in this area are: 1. The main river with a very rich caddisfly community. Dráva is the less polluted large river of Hungary, due to this and to the fast-running water (high oxygen content) many caddisflies breed in it. 2. The oxbow lakes have a general stagnant water fauna. Most of them have become anglers' ponds with all their problems. 3. The smaller and larger gravel pit ponds and lakes originally had rather clear water poor in soluted ions. An interesing though not diverse caddisfly community could form in them. Regrettably, the bulk of these lakes have been destroyed by anglers: their water has become polluted, and the neighbourhood of the lakes is covered by litter. 4. The small tributaries were not examined exhaustively. Some species live only along these ones. 5. Smaller and larger forest moors also have characteristic caddisflies (Trichostegia minor, Limnephilus stigma. Limnephilus subcentralis, Holocentropus stagnalis etc.) 5. The small spring moors are the most interesting aquatic biotope of Dráva Region, with only a few caddisfly species (Plectrocnemia conspersa, Lype reducta, Beraea pullata, Ernodes articularis and Helicopsyche bacescui). Three out of these five caddisflies were collected only here, and, through by the occurrence of Helicopsyche bacescui here it is one of the most important habitats of the National Park. Authors' address: Dr. Sára NÓGRÁDI, Dr. Ákos UHERKOVICH Natural History Department Janus Pannonius Museum P. O. Box 347. H-7601 Pecs E-mail: uhu@ipisun.jpte.hu