Full-text - Norsk entomologisk forening

Dicranomyia (Me/anolimonia) rufiventris(Strobl, 1900)Dieranomyia (Sphaeropyga) autumnalis(Staeger, 1840)Dicranomyia (Sphaeropyga) stigmatiea(Meigen, 1830)Metalimnobia zetterstedti Tjeder, 1968Limonia macrostigma (Schummel, 1829)Limonia sy/vieo/a (Schummel, 1829)HABITATSOf the 45 species recorded, only 9 seem to beof terrestric origin. The remaining specieslive in aquatic or semiaquatic habitats. Speciesof terrestric origin are: Phyllo/abis maeroura,Limonia maerostigma, Dicranomyiamodesta (?), Limonia sy/vieo/a, Ula mollissima,U. sy/vieo/a, Rhiphidia duplieata, Metalimnobiazetterstedti, and Chionea araneoides.The dominant spcecies in the low andsubalpine zones is a terrestric species.DISTRIBUTION AND ABUNDANCEOF SPECIES IN THE STUDY AREATab. 1 shows the number of species collectedat different sites during 1980 to 1983. Tab. 2gives species collected at different altitudes,and Tab. 3 relative abundance in the low andsubalpine zones.In the middle alpine zone, three species,Dicranota querini, Dicranomyia incisurataand Phyllo/abis maeroura were collected. D.querini is certainly a true inhabitant of thisbiotic zone, but because only one specimen ofeach of D. incisurata and P. macroura wasrecorded, these species may have flown orblown in from lower altitudes.In the low alpine zone, 36 species werecollected. The very dominating species wasPhyllo/abis macroura, which occurred at allsites and outnumbered other species at mostsites. Of 1125 specimens examined from thelow alpine zone,P. macroura made up 72.6%,and the remaining species had each a lowerpercentage than 3.6, which was estimated forIdioptera macropteryx.Thirty-seven species were caught in thesubalpine zone, and again Phyllo/abis maerourawas the dominant species, counting51.4% of 1006 individuals collected here. P.macroura was present at all sites investigatedin this zone. The second dominant specieswas Dicranomyia hyalinata, which represen­67