Abstract
This paper represents a field study of mites and collembola~is on the 32 year old eruptive island Surtsey, 30 km south of Iceland. The data were collected in July 1995. Five squares, each 3x3 m' were investigated, representing different successional co~ntnutlities 011 the island. Mites were the most numerous soil arthropods followed by collembolans. 80,000-240,000 mites and 68,000-97,000 collelnbolans per 111' were found ia and close to a gull (Lanix n~~e~z~alz~s) colony, dolni~~ated by the grasses Puccz~zellin ~etroJex~ the cornmon meaclo~v grass (Poa plnteluis) and the plant colnlnoll scurvy-grass (Corlzlewin offirz~zal~s). In a pioneer commuility domi~lated by the sea purlane (Honkenyo pe1)loides) and the sea lyine grass (L~I~~ZLS m-~na~zn) about 190,000 mites and 10,000 colle~~lbolalls per m' were collected. Oribatid mites (Oribatida) were unexpectedly I-epr-esentecl on Surtsey with 22 species, huo of the species inay have arrived Crom North America (Neal-ctic). All other species roui~d on Surtsey no st likely have spread from Iceland or Western Europe.
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