Ábrahám Levente (szerk.): Válogatott tanulmányok IV. - Natura Somogyiensis 15. / Miscellanea 4. (Kaposvár, 2009)

Csordás Lilla et al.: Újabb adatok a ritka hegyiszitakötő (Cordulegaster haros, Theischinger, 1979) zselici elterjedéséhez

Csordás L., Ferincz A., Lőkkös A., Rozner Gy.: Cordulegaster heros

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Fig. 1: Larva and imago collected data in Zselic hills

Discussion

There are several significant differences between brooks of the Northern and the Southern Zselic. The Southern brooks have high and constant flowrate till the Northerns have low and fluctuating, most of them get dry time by time. Since the larva of Cordulegaster heros has long, even 5 years development period, the species has need brooks with constant waterflow.- The dragonfly populations are strong in the brooks of South Zselic like Sormás-patak or Sándor-árok. In future, further habitats are likely to be discovered in this region. .- In the northern area, waterflows have fluctuating flowrates and frequently dries out. Protection of these habitats are still important, since minor populations were also detected here and in wet climatic periods, these habitats may maintain small populations. Good example for this the Márcadó-árok. This brook is very small, its water-depth is only few centimeters, 20-30 cms wide and its total length on surface is not longer than 100 m. Even in this small brook, we were succeed to find exuvium and larva as well. Based on the small number of larvae and exuviums found, the population density could not be larger than 1 or 2 specimens in this 100 m section. In spite of small population density, the protection and conservation of these minor habitats is still important. This finding