Fróðskaparrit - 01.01.1993, Page 121

Fróðskaparrit - 01.01.1993, Page 121
125 Invasion afadmiralen (Vanessa atalanta L.) og andre sommerfugle pá Færøerne i 1992 Svend Kaaber, Peter Gjelstrup, Dorete Bloch og Jens-Kjeld Jensen Úrtak I 1992 vóru nógvar firvaldaflytingar skrásettar í Føroy- um. Um leið 20. mei var ein víðfevnandi innrás av kálmølum, Plutella xylostella L. og admiralum, Vanessa atalanta L. I hesi innrás varð eisini rakt við Pieris brassicae L. (2 ferðir), Colias crocea Fourcr. (eina ferð), páfirvaldar, Inachis io L. (4 ferðir), notufirvaldin, Aglais urticae L. (eina ferð) og randafirvaldar, Nymphalis antiopa L. (tvær ferðir). Tíðliga í juni varð rakt við eina lftla innrás av tistilfirvaldum, Cynthia cardui L. I sep- tember vóru aðrir ferðandi langvegisfrá funnir í m.ø. ljósfellum, teirra millum 2 kongafirvaldar, Agrius con- volvuli L. og 1 Mythimna unipuncta Haw., saman við 5 Agrochola circellaris Hfn. og 2 Rhizedra lutosa Hb. Hesi trý síðst nevndu sløgini, C. crocea, P. brassicae og innførdi Pieris rapae L. eru skrásett í Føroyum á fyrsta sinni. Grundað á veðurfrøðiligt tilfar frá tíðarskeiðinum, tá ið innrásin var, hevur verið kjakast um, í hvussu stór- an mun sløgini úr Suður-og Miðeuropa eru flutt til Før- oya. Tá ið flytifirvaldurin, admiralurin, V. atalanta var eygleiddur úti um landið, eftir at hann var komin higar, kom týðiliga til sjóndar, at hann hevði lyndi til at amast upp á fjallatindar, ið eru 400-650 m oman fyri sjóvar- málan. Sum summarið leið, kom eitt sterkt ættarlið av ormverum sitandi á notu, Urtica dioeca fram nógva- staðni, har væl vart tilhald var. Kortini var í august og tíðliga í september bara komið fram á 9 fullvaksnar inn- lendskar firvaldar av hesum slag. Tá ið seinni varð rakt við munandi fleiri firvaldar av hesum slag í Føroyum, varð mett, at hesir vóru vindbornir firvaldar frá heyst- flytingini suðuri í Miðeuropa. Abstract In 1992 several lepidoptera migrations were registrated on the Faroe Islands. A large-scale invasion of Plutella xylostella L. and Vanessa atalanta L. occurred around May 20 , which also included Pieris brassicae L. (2 observations), Colias crocea Fourcr. (one observation), Inachis io L. (4 observations), Aglais urticae L. (one ob- servation) and Nymphalis antiopa L. (2 observations). In early June a small-scale invasion of Cynthia cardui L. was observed. In September other long-distance migrants were found a.o. in light traps, including 2 Agrius convolvuli L. and 1 Mythimna unipuncta Haw., together with 5 Agrochola circellaris Hfn. and 2 Rhizedra lutosa Hb. The three lastmentioned species, C.crocea, P.brassicae and an introduced Pieris rapae L. are recorded from the Faroe Islands for the first time. Based on meteorological data during the period of invasion, the spreading of the species from Southern and Central Europe to the Faroes have been discussed. Field observations on the migrant V. atalanta after arrival demonstrated a distinct hill-topping behavior on mountain peaks 400-650 m above sea level. During the summer a strong larval generation evolved in many places with sheltered stands of Urtica dioeca. However, in August and early September only 9 indigenous adult specimens were encountered. A later increase in the Faroese observations was ascribed to wind-spread specimens from the southward autumn migration in Continental Europe. Fróðskaparrit 41. bók. 1994(1993): 125-149
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