4265275600

DIPTERON 26 Tom 26:11-26    | Wrocław, 31 XII2010

Hoverflies (Diptera: Syrphidae) of the Naturę Reserve Aluvium Żitavy (SW Slovakia)

Bzygowate (Diptera: Syrphidae) rezerwatu przyrody Aluvium Żitavy (Płd-Zach Słowacja)

Adrianna Kralikoya¹, Stanislav David², Ladislav Szekeres³

¹ Department of Environmentalism and Zoology, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Trieda A. Hlinku 2 SK-949 76 Nitra, Slovakia e-mail: [e-mail]

² Department of Ecology and Environmentalistics, Faculty of Natural Sciences Constantine the Philosopher University in Nitra Trieda Andreja Hlinku 1, SK-949 74 Nitra, Slovakia

³ Institute of Natural Science and Informatics, Faculty of Central European Studies Constantine the Philosopher University in Nitra Drażovska 4, SK-949 74 Nitra, Slovakia

ABSTRACT. The taxocenoses of hoverflies (Diptera: Syrphidae) of the Natural Reserve Aluvium Zitavy (SW Slovakia) were studied in 2007-2009. The examined area is the part of European network of Natura 2000 sites (SKUEV0159). In total 1047 specimens of hoverflies of 59 species were collected on three sampling sites. The sites represent the ecotone of the grassland dams and the floodplain forest, and wetland macrophyte vegetation. The eudominant species were Episyrphus balteatus (22.35% of specimens sampled), Sphaerophoria scripta (13.37%), Eristalis tenax (12.89%) and Melanostoma mellinum (10.79%). The only dominant was Syritta pipiens (7.74%). In total 19 identified species are ecologically associated with wetland habitats, with the only dominant S. pipiens (7.74%). A rare species in the area is Anasimyia lunulata. The permanent grassland of the dam with the dominant common reed and white willow was evaluated as the best site regarding diversity (H' = 2.14 to 2.83) and equitability (e = 0.73 to 0.86)). Principal components analysis (PCA) was used for the study of the taxocenoses hoverflies structure. By factor analysis, we found a statistically significant effect of two environmental variables. We assume that the main environmental factor is the humidity gradient. The second factor is the type of riparian vegetation (trees, bushes and the permanent grasslands).

KEY WORDS: Diptera, Syrphidae, ecology, taxocenoses. Naturę Reserve Aluvium Zitavy, Slovakia

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