Mobility of Epirrita autumnata (Lepidoptera, Geometridae), as indicated by altitudinal light trap sampling in Finnish Forest Lapland
Eleven light traps with a 500 W blended light lamp installed in virgin habitats in the Varriotunturi fell area, E Finnish Forest Lapland (67°44'N, 29°37'E), were operated daily over the years 1978-1992. The total catch of the autumnal moth Epirrita autumnata was 134787 individuals. The catch varied both between years and between traps, those located on the treeless summit hardly collecting any individuals at all. The most abundant catch was gained not from the mountain birch zone, but from lower altitudes, i.e. from the coniferous forest zone with a rich admixture of deciduous trees, especially birch, The reasons behind the differences are discussed in the light of the mobility of the moths involved.
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