B. Papp szerk.: Studia Botanica Hungarica 35. 2004 (Budapest, 2004)
Gönczöl, János; Révay, Ágnes: Aquatic Hyphomycetes in two streams differing in discharge and distribution of leaf litter
Table 1. Physicochemical and hydrological data of the sampling sites at the Deszkametsző (Desz) and Bagolyb ükk (Bag) streams (* = P < 0.05; ** = P<0.01, t = Desz v. Bag). Desz-1 Des z-2 Bag-1 Bag-2 t altitude (m) 305 235 408 293 distance from the spring (km) 1.3 3.2 3.0 5.6 temperature (°C) 3.5-9.2 1.0-9.4 2.0-8.1 4.0-9.8 discharge (L s 1 ) mean 0.8 8.8 9.2 5.0 pH, mean 7.9 8.2 7.4 7.4 2.69* conductivity (pS cm-1 ), mean 260 270 117 127 5.17** total hardness (°d), mean 11.6 9.8 5.5 6.3 3.64* RESULTS The physicochemical and hydrological characteristics of the two streams at the sampling sites are given in Table 1. The chemical data show that the Deszkametsző is a moderately hardwater stream, whereas the Bagolybükk is a typical softwater stream. The means for pH, conductivity and total hardness were significantly different between the streams. Stream discharge was generally the lowest at the upper site of the Deszkametsző and the highest at the upper site of the Bagolybükk. The analysis of the leaf substratum collected from the streambed above the study sites showed differences in the composition of leaf litter not only between the two streams but also between the sites along each stream, especially in the Bagolybükk stream (Table 2). The leaves of hornbeam (Carpinus betulus), beech (Fagus sylvatica) and linden (Tilia cordata) were the main components of the litter in the streambed at both sites of the Deszkametsző. The leaves of hornbeam and beech were most abundant at the upper site of the Bagolybükk, while maple (Acer campestre) and alder (Alnus glutinosa) were the most frequent tree species at the lower site of this stream. The fungal species encountered in the streams are listed in Table 3. A total of 66 fungal species was distinguished, 11 of which could not be identified at the generic level. Significantly higher numbers of species were observed in the Deszkametsző than in the other stream, however the species number of the samples collected in November were closely similar to each other (Table 4). The total number of species was 58 in the Deszkametsző and 49 in the Bagolybükk (Table 3). The average numbers of conidia per litre of stream water were always considerably higher in the Deszkametsző than in the Bagolybükk. The highest conidial
