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

Fenyősi, László: Studies of avian communities along river Drava, between 2000-2004 (Aves) - Madárközösségek vizsgálata a Dráva somogyi szakasza mentén, 2001-2004-ben

120 NATURA SOMOGYIENSIS were several intensive studies done in Belső-Somogy, there are almost no references to the Drava region in publications about the southern Somogy region (e.g. VASVÁRI 1937, SZÉCHENYI 1942, MARIÁN 1958, KÁRPÁTI 1979, MARIÁN & PUSKÁS 1985, BANK 1989). As of the 1990s, an increasing number of shorter articles have dealt with the avian fauna of the Drava, e.g. FENYŐSI 1993a, 1993b, BÉCSY, FENYŐSI & HORVÁTH 1995, FENYŐSI 1995a, 1995b, FENYŐSI et al. 1995, FENYŐSI & STIX 1996, 1998, JUHÁSZ 1995. The avian fauna of the Hungarian area affected by the planned hydroelectric power plant at Durdevac was investigated by BANK (1990) who provided evidence of the occurence of 163 bird species from the region of Ortilos and Gyékényes. FENYŐSI 1996 provided a summary of observations along river Drava between 1983-1996, with faunal as well as population estimation data being presented. Since the mid-1990s, the more interesting observation data have been published in corresponding issues of the journal Túzok (HADARICS 1996-1999). Reports on Drava region populations were presented by FENYŐSI (1998a) and FENYŐSI & HORVÁTH (2000) on white storks, by FENYŐSI et al. (1998) on barn owls, and by HORVÁTH et al. 2002 on black storks. Short communications were released by FENYŐSI (1998b) on the little tern population nesting along river Drava, by FENYŐSI 1999 on Canada goose occurrence, and by HORVÁTH (2002) on lesser spotted eagle ocurrence. Organized by the Hungarian Water Wildlife Research Group, the waterfowl monitoring of the Drava reach between Bares and Szentborbás was launched in 1996. The results are found in the study volmes by FARAGÓ (1997, 1999, 2001) and in the papers by FENYŐSI (2000a, 2002), where it is reported that 27 water bird species occurred on the Barcs-Szentborbás Drava-reach in the studied period. The avian fauna of areas along the Hungarian section of river Drava was reported by PURGER (1998) to include 154 species based on observations between 1995-97, and 217 species based on available literature data. The results of bank swallow population surveys done between river kilometres 199-132 of Drava in 2000-2003 were presented by FENYŐSI (2003). Water birds occurring on the gravel-pit pond excavated in Gyékényes in the Drava gravel plateau were studied by MEZEI (2001, 2003). Further information is provided about the avian fauna of the Drava in the synthetic bibliographic study on the birds of the Bares Juniper Woodland (FENYŐSI 2000b), and by the work analysing the checklist and ornithological literature of birds having occurred in Somogy county before 2000, in PURGER & FENYŐSI 2001. Publications on the avian fauna of Croatian and Slovenian territories of the Drava are released in the leaflets Acrocephalus and Troglodytes, especially from the regions of Maribor-Ptuj, Ormoz-Légrád and Donji Miholjac. Results of ornithological research in areas affected by the planned hydroelectric power plant are published by RADOVIC (1996), reporting on the occurrence of 95 bird species. The avian fauna of Croatian territories of the Drava between Gyékényes and Bélavár is dealt with by RADOVIC (2004). The area investigated in this paper is primarily the 1-4 km wide stripe extending along Drava between Őrtilos-Gyékényes and Bélavár-Szentborbás, with data originating predominantly from these areas. Although the Drava section between Gyékényes and Bélavár is exclusively Croatian, some investigations were nevertheless done here too. The selected monitoring areas where regular sampling was done within Duna-Drava National Park are as follows: - the water body of river Drava, both Huungarian and Croatian, with gravel shoals and high banks - floodland forests near Őrtilos-Zákány and Vízvár - Jalszina-meadow in Berzence The Zákány hills in the westernmost pocket of the study area belong to the Zalaapátiplateau small region. The other small region, of 1-4 km width, extending on the left side