Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 84. (Budapest 1992)

Gönczöl, J. ; Révay, Á.: Aquatic Hyphomycetes in softwater and hardwater streams of the Aggtelek National Park, NE Hungary

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Tomus 84. Budapest, 1992 p. 17-31 Aquatic Hyphomycetes in softwater and hardwater streams of the Aggtelek National Park, NE Hungary by J. GÖNCZÖL & Á. RÉVAY, Budapest GöNCZöL, J. & RÉVAY, Á.: Aquatic Hyphomycetes in softwater and hardwater streams of the Aggtelek National Park, NE Hungary. -Annls hist.-nat Mus. natn. hung. 1992, 84: 17-31. Abstract - The aquatic hyphomycete flora in eight hardwater and one softwater stream of the Aggtelek National Park was investigated by examination of submerged decaying leaves, wood and foam. Species number in the hardwater and softwater streams was almost the same whereas the species composition differed distinctly. A somewhat higher species number was found in the hardwater streams passing through beech forest as compared with hardwater streams with alder riparian vegetation and a distinct difference between species composition of the two stream types was obtained. Some rare and recently described species were encountered in this region of Hungary. With 30 figures. INTRODUCTION During the past two decades studies on Ingoldian Hyphomycetes of Hungary have been concentrated on the Morgó-stream system in the Börzsöny Mts. (Northern Hungary). There have been a few further attempts to study the regional distribution of these fungi in Hungary as well as their occurrence in different aquatic environments, but only few of these investigations have been published so far. Observations on aquatic and aero-aquatic Hyphomycetes in hollows of living trees from SW Hungary have been reported (GÖNCZÖL 1976). The aquatic hyphomycete flora of two softwater and two hardwater streams of the Bükk Mts. was investigated and discussed later (GÖNCZÖL 1987). During a research programme on Hungarian National Parks there has been some opportunity to study some streams of the Aggtelek National Park. The present paper gives a further contribution to the distribution of aquatic hyphomycetes in Hungary. CHARACTERISTICS OF THE AREA AND THE STREAMS The geographical location of the Aggtelek National Park: N 48° 26'-48° 34'; E 20° 3O'-20° 48'. This area belongs to the Central Hungarian Range and is formed in considerable part by limestone and dolomite of Triassic origin but this structure is replaced by clastic sediment of Oligocène, Miocene and Pliocene origin on the southern margins of the area. Chemical characteristics and a list of the dominant riparian vegetation of the nine investigated streams are given in Table 1. Two of the streams (Patkós and Kecskekút) are typical deeply cut canyon-streams with shallow water and medium flow, and a thick litter layer in the bed, situated 300-450 m a. s. 1. In both of the streams widespread travertine formation has been observed. The other seven streams are more or less meandering, with generally larger and deeper bed, medium flow and without thick deposition of leaf litter in the bed, situated ca. 200-300 m a. s. 1. Only one (Hidegvfz-stream) of the streams has typical softwater (total hardness 1-3 °d), all the others have medium to hardwater (total hardness 15-23 °d).