Ábrahám Levente: Válogatott tanulmányok II. - Natura Somogyiensis 9. (Kaposvár, 2006)

Körmendi Sándor: Somogy megyei lápok hidroökológiai vizsgálata - Hydroecological investigation in different moors of Somogy county

140 NATURA SOMOGYIENSIS Hydroecological investigations in different moor of Somogy county SÁNDOR KÖRMENDI According to the water quality examinations the salinity and organic matter (COD) of water is increasing in moors in line with the lapse of period of vegetation. The primer production of these water bodies is not limited by the concentration nitrogen and phosphorus. The occuring Rotatoria and Crustacea taxons were generally euryec, cosmopolite, poly cyclic organisms. The number of the euplanctonic taxons is under 20 %, the most significant ones are the metaphytic and benthic organisms, and only a few of these taxons indicate the moors (for example: Mytilina ventralis, Beauchampielle eudactylota, Platyias quadricornis, Trichocerca weberi, Simocephalus exspinosus, Daphnia curvirostris). Comparing the results of the investigation series of four years, also taking the prior (1965, 1985) data into consideration, based on the quality test it can be stated that in the examined moors extensive modification of Rotatoria and Crustacea fauna - decrease in number of species, disappearance of species, emergence of new species, small amount of indicator taxons - is observable. The causes of these tendencies are primarily the succesion accelerated by the change of water quality and water amount, and also the unfavorable environmental effects (drought, desiccation, extinction of forest in the alder of Lankóci, the illegal liquid manure placement near the alder of komiósdi). On the grounds of the researches it is necessary to attract attention to the importance of the continuation of biomonitoring examinations, because the change of water quality in water bodies necessitates conservationist intervention.