Author(s): Papp, L.
Title: Drosophilid assemblages in mountain creek valleys in Hungary (Diptera: Drosophilidae) 1.
Year: 1992
Volume: 53
Pages: 139-153.
Abstract: In 1988-90 apple-bait collection of Drosophilidae were made in four sites of low mountain creek valleys in N and NE Hungary (yielding more than 9000 ex.). Representatives of 40 species were caught (31, 31, 36 spp./year), some of them are new to Hungary (1988 n=12: 6 to 18 spp./sample, 1989 n=13: 7 to 16 spp./sample, 1990 (n=10): 5 to 21 spp./sample); 8,8, and 9 spp. were caught only once, 6, 5 and 7 spp. were represented by a single specimen. The population frequencies in the assemblages changed profoundly from one year to another as a natural process. The population size ratio of the rare and the dominant species is supposed to be 1 to 103-104 or even higher. The S.-W. diversity index values are not high, evenness is highly variable (from medium to low). The differences in the assemblages of the collecting sites were analysed by some quantitative methods (Berger-Parker index, similarity indices: Czekanowski, Renkonen indices, dendograms of the similarity index). It was found that a good part of the drosophilid species is so rare, that only an indefinite part of the extant rare species is to be detected at all in a given area. However, ratios of the populations of the dominant-subdominant, constant-subconstant species are hypothesised, with which more non-detected species are to be expected than behind population frequencies deformed, by human activity.Journal: Folia entomologica hungaricaJournal abbreviation: Folia ent. hung.ISSN: 0373-9465Publisher: , Editor(s): Mahunka, S.