Az Alpokalja természeti képe közlemények 4. (Praenorica - Folia historico-naturalia. Szombathely, 2001)

Czigány Boglárka–Ábrahám Levente: Nappali lepkék diverzitásának vizsgálata három jellegzetes göcseji élőhelyen (Lepidoptera: Rophalocera)

IV PRAENORICA FOLIA HISTORICO-NATURALIA 2001 NAPPALI LEPKÉK DIVERZITASANAK VIZSGÁLATA HÁROM JELLEGZETES GÖCSEJI ÉLŐHELYEN (LEPIDOPTERA: RHOPALOCERA) CZIGÁNY Boglárka

1 — ÁBRAHÁM Levente

2 Investigation on the diversity of the butterfly fauna in three characteristic habitats in Göcsej (Lepidoptera: Rhopalocera) — The authors carried out a spatial-temporal diversity investigation on the butterfly fauna of three different habitats in SW Hungary. The characteristic habitats in Göcsej'

s hilly area were a wet meadow, a semi dry meadow and an agricultural field. The line transect method, when the area is divided into 10x10 m quadrates was used to measure the sample material along an 100 metre line which consists of almost homogenous habitats. In the course of the survey 23 species of 387 specimens in the wet meadow, 34 species of 835 specimens in the semi dry meadow and 12 species of 120 specimens in the agricultural field were collected which were substantially fewer than in both previous cases. The Satyridae species (57%) were the most dominant among the butterfly families in the semi dry meadow while the dominant family in the wet meadow was Pieridae (56%). The dominance of Satyridae (48%), Pieridae (47%) were almost equal in the butterfly assemblages of the agricultural field. Considering the dominance of the species it can be stated that several species in the semi dry meadow have similar relative frequencies in relation to each other. Pieris napi (27%) was the most abundant species in both, the wet meadow and the agricultural field. By studying the dominance distribution curves of the different assemblages they show that the curve of the assemblage in the semi dry meadow fits theoretical lognormal curve best. SHANNON-WIENER formula was chosen to describe the diversity changes in time. This results show that the fluctuations of the diversity in time were fewer in the both semi natural assemblages, wet meadow and semi dry meadow than values of the assemblage in the agricultural field. The lowest evenness shows the assemblage in the agricultural field. The assemblage in semi dry meadow shows the highest values of diversity by the diversity ordering used by RÉNYI diversity formula at the every value of scale parameter. The assemblage in agricultural field has the lowest species richness and the lowest diversity. The reason of this was probably the monoculture and continuous disturbance (spraying, harvesting etc.). Besides, the authors analyse the reasons of the changes of diversity in the both semi natural habitats as well. 1 H-8956 Páka, Sugár út 34., Hungary 2 Somogy Megyei Múzeum, Természettudományi Osztály H-7401 Kaposvár, Pf. 70., Hungary