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Distribution and seasonal abundance of adult.stoneflies (Plecoptera) in the Dovrefjell NationalPark, South Norway*JOHN O. SOLEM, JARLE STEINKJER AND SIMEN BRETTENSolem, J.O., Steinkjer, J. & Bretten, S. 1987. Distribution and seasonal abundance ofadult stoneflies (Plecoptera) i n the Dovrefjell National Park, South Norway. Faunanorv. Ser. B, 34, 45-50.Emergence traps and Malaise traps used at 12 sites in the Dovrefjell National Parkcaught 24 species of adult stoneflies. Their relative abundance and the number of siteseach species were collected at, showed that 13 species, Arcynopteryx compacta, Diurananseni, Isoperla obscura, Brachyptera risi, Amphinemura standfussi, A. sulcicollis,Nemoura cinerea, Nemurella pictetU, Protonemura meyeri, Capnia atra, Leuctrafusca,L. hippopus and L. nigra were widespread and common in the National Park. Theremaining II species had a restricted distribution, but may be locally abundant. Diurabicaudata, Dinocras cephalotes, Siphonoperla burmeisteri, Amphinemura borealis,Nemoura avicularis, and Capnia pygmaea were collected at one site only.John O. Solem and Jarle Steinkjer, University of Trondheim, The Museum ErlingSkakkesgt. 47A, N-7000 Trondheim, Norway.'Simen Bretten, University of Trondheim, Kongsyoll Biological station, N-7340 Opp­dal, Norway.INTRODUCTIONconsidered a reference area, and the presentIn a large scale the stonefly fauna of Norwaypaper give data on the distribution, abuniswell known, and the greatest contributiondance and flight periods ofthe stonefly faunato the occurrence and distribution is given by in the Dovrefjell National Park.Lillehammer (1973, 1974). However, thestonefly fauna, or for that matter, the insect STUDY AREA AND METHODSfauna of our. national parks is almost unstudyarea was the surroundings ofknown. From general knowledge of the dis­ Thetribution ofinsect species, we can predict that Kongsvoll Biological Station (62 0 ITN, 09 0a given species will be present in e.g. the 59'E) between the elevations 870 m and 1452Dovrefjell National Park, but nothing is m in the Dovrefjell National Park, Southknown about the actual number of species, Norway (Fig. 1). The River Driva is the mainwhich species are common and widespread, water course into which all the smallerwhich are locally distributed, which are rare, streams empty. In general, the streams arespecies abundances and composition of inplingwas made at eight streams and the Riverfastflowing, except for Jerosbekken. Sam­sect communities. This holds for all the nationalparks in Norway. Our national parks Driva. Two-sided Malaise traps (Fig. 2) andare protected against major disturbances and emergence traps ofthe tent type (Fig. 3) werethey should be excellent reference areas for used, and the sampling covered the periodlife sciences. Today our national parks are late May to October. Solem (1985) gives areference areas of spectacular topography, a table of thl' number of Malaise traps at thefew for vegetation, birds and mammals, but streams and the years they were used. Atnone for insects. Scientific documentation is Vestbekken and Kvernbekken only emeranecessary requisite before an area can be gence traps were used, 16 and 4 traps, respec­tively. Following the definitions of the biotic• Printing grant given by Kongsvoll biological zones in Sjors (1967) and Ronning (1972),station.the sampling covered the sub-alpine, low andFauna noTV. Ser. B, 34: 45-50. Oslo 1987. 45