Janus Pannonius Múzeum Évkönyve 36 (1991) (Pécs, 1992)

Természettudományok - Uherkovich, Ákos–Nógrádi, Sára: The Trichoptera fauna of Magyarszombatfa, West Hungary

TRICHOPTERAOFMAGYARSZOMBATFA 23 known localities are: Bakony Mts.: Cuha Valley (Újhelyi 1979), Budapest, Sopronhorpács, Tanakajd, Tarhos (Újhelyi 1971) and Barcs (Nógrádi 1985b). Only single or very few specimens were collected at these sites. Setodespunctatus Fabricius, 1793. E 1 6 5 9 9. July 7,1983 1 9, July 20,1983 1 6, July 11,1984 4 9 9 (It). In some slowly running waters S. punctatus is frequent species. Setodes viridis Forcroy, 1795. £ 34 в 6 9 9 9. June 13—

July 19,1983 31 6 6 9 9 9, July 25,1984 1 cî, July 31,1984 2 d J (It). Nógrádi (1984) reported it from Magyarszombatfa as a new species for Hungarian fauna. Since that time no other locality of this species has been found. In Austria this species has not been collected yet (Malicky 1989). Leptocerus tineiformis Curtis, 1834. Z 12 6 6 40 9 9. June 20,1984 1 9 (U); June 27—

July 23,1983 2 o*d 7 9 9, June29—

July 12,19848 6 6 27 9 9, July 14—

Aug. 17,1985 2 6 6 5 9 9 (It). It is a common species everywhere, in some stagnant water it lives in rather large mass. Adicella filicornis Pictet, 1834. Z 1 6. Aug. 21, 1984 1 6 (U). It live s in mountainous streams usually, rare species. Known localities are: Jósvafó (Oláh 1967); Gyöngyös (Nógrádi 1989c, 1989d); Szóce (Nógrádi 1989a); Kőszeg (Nógrádi—Vherkovich 1992). Sericostomatidae Notidobia ciliaris Linnaeus, 1758. S 19 6 6 24 9 9. Újhelyi (1981a); May 22,1984 6 6 6 (N, U). It is frequent along small native water courses of West and Southwest Transdanubia and Northern Mountains. Diurnal species, it does not fly onto light. Beraeidae Beraeapullata Curtis, 1834. Z5 6 6 7 9 9. Ujhelyi (1981a); May 16,1983 1 9, May 22,1984 16 1 9 (N, U); June 2, 1984 1 6 1 9, May 22,1985 1 6 2 9 9 (U). Frequent species of small streams and creeks of hilly and mountainous regions. Beraeodesminutusbinmeus, 1758.LI 6.May

21, 1985 1 6 (U). It is frequent along small streams running in forests

, in alder stands, or marshy meadows. Discussion Faunistical results This is the point of Hungary where the most caddisfly species were collected: these 99 ones represent 50.2 p. с of the total Hungarian fauna. (197 species have been known from our country.) Some examples for other rich collecting sites as it follow: Kisdobsza — 64 species, Szőce — 84 species, Lipótfa, Zselic Downs — 59 species, Kőszeg, Chernel's Arboretum 53 species, etc. In the environment of the collecting site (see Fig. 2) further species were collected which did not occur at Magyarszombatfa (e. g. Chaetopteryx fusca Brau., С h. rugulosa Kol.,Ptilocolepus granulatus Pict.

, Synagapetus mosely Ulm., W

ormaidia occipitalisPict.,see also Nógrádi 1989a). Together these species the region of southern part of the Hungarian Praealpine Zone is the richest region of Hungary in caddisfly species surpassing some of our mountains, too. Thus 100 species have been known from the Bakony Mountains (Uherkovich—

Nógrádi 1988), 84 species from the Zselic Downs (Nógrádi—Uherkovich 1990), 88 species from the Kőszeg Mountains (Nógrádi—Uherkovich 1989), about 85 species from the whole territory of the Graet Hungarian Lowland (authors' unpublished examinations.) At Magyarszombatfa any species of Philopotamidae, Brachycentridae and Odontoceridae do not occur. Philopotamids live in quickly running brooklets, one of them (Wormaldia occipitalis Pict.) lives nearby Szőce, but it was not captured at Magyarszombatfa. The number of collected species and their ratio in the Hungarian fauna is shown in Table 3. Analyzing the composition of Trichoptera fauna of Magyarszombatfa, first we may establish that two species are known only from this site (Oecetis testacea Curt., Setodes viridis Fourcr.). Other species (Limnephilus elegáns Curt., Hydroptila tineoides Dalmann, Glossosoma boltoni Curt.) have only two localities in Hungary, one of them is just this site. Beside these species we must mention some others, which are very rare in Hungary having more (3 to 5) collecting sites. Such species aiePolycentropus irroratus Curt., Oligotricha striata L., Platyphylaxfrauenfeldi Brau., Adicella filicornis Pict. These unique or very rare species develop in small, non-polluted, natural brooks or in bogs (marshes). Mostly the species of bogs are in the final stage of becoming extinct. Change of caddisfly fauna In the eighties a quick reduction of species has started. The number of species was also on the decline at Magyarszombatfa. In 1985 less species were collected than either in 1983 or in 1984. Such trend was observed at several other places, too. Various reasons could cause this process, three of them will be sketched here. 1. In the past years the annual rainfall decreased. Thus the level of stagnant waters and bogs have deminished, some of them became dry. For example: the small ponds and bogs in Bares Juniper Woodland are