Janus Pannonius Múzeum Évkönyve 35 (1990) (Pécs, 1991)

Természettudományok - Nógrádi, U. Sára–Uherkovich, Ákos: Caddisflies of the Eastern Mecsek Mountains, Hungary (Trichoptera), II.

22 S. NÓGRÁDI-Á. UHERKOVICH years. We collected it again in January (on 7th Jan., 1988). The quantity of caddisflies in the two light traps differs from each other significantly (see Tables 1-2). Rhyacophilafasdata Hag. was the dominant species at Óbánya, it counted about a third of the total material. The quantity of all Hydropsyche species was only 10.27 p. с Two species of streams {Potamophylax nigricornis Pict., Chaetopteryx major McL.) was relatively frequent, and the ecological indifferent Limnephilus lunatus Curt, reached 7.4 p. с An interesting problem is the occurence of Chaetopteryx schmidi mecsekensis Nógrádi in the material of light trap and Malaise traps. As it is known, this species is unable to fly but it walks very much. It climbes up all high objects, e. g. plants, bushes, trees and, of course, light and Malaise traps, too. Thus it can fall into the killing jar of the traps. On the contrary, only one male of Rhyacophyla fasciata. Hag. was captured by the light trap at Püspökszentlászló. The most frequent species was Chaetopteryx majorMcL. here, and Potamophylax nigricornis Pict. reached a high dominancy. It is interesting, that Hydropsyche contubernalis McL. reached more than 25 p. с here (the total mass of Hydropsyche species exceeded 31 p. a). The origin of this big mass is unknown, as H. contubernalis McL. lives in mass in slow, muddy streams and rivers. The small brooks of the environs run quickly and they have stony bed. Maybe these numerous specimens immigrated from the South, along the valley, they might hatch in the slow streams at the southern foot of Mecsek Mountains. Most Hydropsyche are able to fly several kilometres. Close to the light trap of Püspökszentlászló there was a small artifical pond in the arboretum. Two leptocerid species might develop here. On Figs. 1-3 we show the activity graph of the most abundant species in the two light traps. Summary In the past years 46 caddisfly species were taken in the Eastern Mecsek Mountains. Two of them are new for the fauna of this region, Plectrocnemia minima Klap. proved to be new for the Hungarian fauna. This is the northernmost occurence of this species published from Southern Carpathians, Yugoslavia and Bulgaria. Other rare and characteristic species of the Mecsek Mountains were collected again. The most frequent species are Rhyacophilafasdata Hag. and Chaetopteryx major McL. on the strenght of Ä M J J ' A '• S ' О N Fig. 1. Activity graph of four species at Óbánya, in 1985-86. 1. ábra. Négy faj rajzásdiagramja Óbányán, 1985-86-ban.