Janus Pannonius Múzeum Évkönyve 40 (1995) (Pécs, 1996)

Természettudományok - Nógrádi, Sára–Uherkovich, Ákos: Trichoptera communities of the river Fekete-Körös in Hungary

A Janus Pannonius Múzeum Évkönyve 40 (1995) 45- 52 Pécs, 1996 Trichoptera communities of the river Fekete-Körös in Hungary Sára NÓGRÁDI and Ákos UHERKOVICH NÓGRÁDI, S., UHERKOVICH, Á.: Trichoptera communities of the river Fekete-Körös in Hungary. Abstract. More than 31,000 specimens of 57 species were captured during 1989-1994 by a light trap set up along the river. Quantitative tables and analysis for each year are presented. Comparision of Trichoptera communities of some larger rivers of Hungary is made. Some remarks are given on the role of aquatic transport in the case of some caddisfly species. With 3 figures. Introduction The Trichoptera fauna of the Great Hungarian Plain was known very unsatisfactorily up to the year 1990, when we summarized all the knowledges of their fauna in a paper (UHERKOVICH, NÓGRÁDI 1990). The fauna of the Hortobágy National Park was elaborated by ÚJHELYI (1983) and the Trichoptera of Bátorliget, NE Hungary, a remarkable nature reserve of relict bogs and marshy places, was also one of our topic for faunistic studies (NÓGRÁDI et al. 1990). Some caddisfly data originated from the vicinity of the river Fekete-Körös have been already presented (UHERKOVICH and NÓGRÁDI 1990). The river Fekete-Körös („Black Körös") springs from Bihor Mts. (Muntii Bihorului, Bihar-hegység), Romania. Its total lenght is only 150 km, of which the Hungarian reach is 15 km. The catchment area covers 4645 km

2

. The average discharge of the river runs to about 30 m

3

.sec

_1 near its estuary, the discharge of average high-water runs to 280 m

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.sec~\ as well as the average low-water 2 m

3

.sec"\ consequently the fluctuation of discharge is quite remarkable. (The absolute maximum of discharge was 572, the minimum 0.4 m

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.sec

_1

!) The yearly water output runs up to 900 million m

3

. The river belongs to the most unpolluted waters of Hungary. Method and material After the publication of our paper cited above (UHERKOVICH, NÓGRÁDI 1990) the study of the caddisfly community in the river Fekete-Körös was carried on. The light trap, which was set up at Sarkad-Malomfok, southeast of the town Sarkad, was fitted by a 80 watt mercury vapour bulbs (Figs. 1-2). Fig. 1. The location of the collecting site on UTM grid map of Hungary. 1. ábra. A gyűjtőhely Magyarország hálótérképén. It captured 31,329 specimens (12,779 tfcf and 18,550 ? ?) of 57 Trichoptera species between 1989 and 1994 (Table 1, Fig. 3). The number of captured caddisfly specimens were increased by our personal activities, thus the summarized number of caddisflies specimens are not equivalent with the summary as presented on Table 1 (Table 2). The number of specimens and species captured in the mentioned years differs from each other considerably, as shown (Table 1).