Ábrahám Levente: Biomonitoring a Dráva folyó magyarországi szakasza mentén 2000-2004 - Natura Somogyiensis 7. (Kaposvár, 2005)

Uherkovich, Ákos - Nógrádi, Sára: Middle-term changes in caddisfly (Trichoptera) communities of the Hungarian part of Drava river during the years 1992–2004 - Tegzes együttesek középtávú változásai a Dráva magyarországi szakasza mentén, 1992-2004 folyamán

Natura Somogyiensis 7 49-62 Kaposvár, 2005 Middle-term changes in caddisfly (Trichoptera) communities of the Hungarian part of Dráva river during the years 1992-2004 UHERKOVICH ÁKOS & NÓGRÁDI SÁRA H-7633 Pécs, Építők útja 3/b. I. 6., Hungary, uhu@ipisun.pte.hu UHERKOVICH Á. & NÓGRÁDI S.: Middle-term changes in caddisfly (Trichoptera) communities of the Hungarian part of Dráva river during the years 1992-2004. Abstract: 113 species are known from the Dráva region. All the collections were quantitative. Some sites were examined during a longer period (i.e. middle term), thus the change of caddisfly communities or collectives are to be studied. The longest and most complete series of data is from Vízvár, the most abundant caddisflies of this site are presented and analysed. Key words: Trichoptera, Dráva river, communities, quantitive samples Introduction The study of caddisfly (Trichoptera) fauna of Dráva region dates back to the beginning of the eighties, when ÚJHELYI (1981) and NÓGRÁDI (1985a) went on to collect materials at the waters of the Bares Juniper Woodland. Their papers introduced 65 caddisfly species from that area. Later - mostly after 1991 - we could extend our activity over the whole area of the Dráva region, mainly around the river and its tributaries. Between 1992 and 2004 we examined the caddisfly fauna and communities of the river systematically. Four papers were published about the results (NÓGRÁDI, UHERKOVICH 1995, 1998, UHERKOVICH 2005, UHERKOVICH, NÓGRÁDI 1992). Altogether 113 species were recorded out during these years from the whole region, some of them occured here first: Orthotrichia tragetti Mosely, Oxyethira flavicornis (Pictet), Micrasema setiferum (Pictet) (NÓGRÁDI 1985b); Orthotrichia angustella (McLachlan), Hydroptila forcipata (Eaton), Adicella syriaca Ulmer (NÓGRÁDI 1986); Helicopsyche bacescui Orghidan & Botosaneanu, Limnephilus stigma Curtis (NÓGRÁDI 1988); Limnephilus subcentralis Brauer (NÓGRÁDI 1992) and Hydroptila pulchricornis (Pictet) (NÓGRÁDI 2001). It is unquestionable that the fauna of Dráva river and its region is rather rich in species. We can remark that only 85 species have been detected so far from the well-known 'Szigetköz', upper Danube region (UHERKOVICH, NÓGRÁDI 2004), or 74 species from the Szatmár-Bereg Plain (UHERKOVICH, NÓGRÁDI 1998). Not only the species but the quantitative relations were also recorded in all samples as well. Thus we could study the change of composition of caddisfly communities or collectives of each sites.