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

Ábrahám, Levente.: Biomonitoring of the butterfly fauna in the Drava region (Lepidoptera: Diurna) - Nappali lepkék biomonitoring vizsgálata a Dráva mentén (Lepidoptera: Diurna)

70 NATURA SOMOGYIENSIS Fig. 8: Number of the protected and endangered species in the Drava region Zerynthia polyxena The time trend of this species during the four year of the investigation reflects a relative stability (Fig. 7.). However, the caterpillar population examined was small therefore any changes in the environment implies danger to its stability (ei. get dry). Because of the construction of the dam, the butterfly fauna of the examined area is highly at risk. Numerous species can be found in the region that are classified as endangered species even in the European Union (Fig. 8). In order to evaluate the results of the teamwork investigation on the butterfly species of the area, at least a decade of collecting work is necessary. It would require at least a decade of research to give a comprehensive evaluation of the international/community level survey results that has been carried out to investigate the species of butterfly fauna of the region. Discussion The biomonitoring research work on the butterflies at the River Drava has surveyed the specific, endangered species of this fauna based on a hydro-ecological gradient. The distribution of Apatura metis population along the River Drava is not even: the highest number of the population lives in the Palinai forests at Bélavár. The first generation is larger in number than the second generation. The variability is significant comparing the results of the sampling from year to year; the stronger the population the less the variability is.