Abstract
Abstract We investigated the species composition and prevalence of seabird (final hosts) trematodes in periwinkles (mainly Littorina saxatilis and L. obtusata; first intermediate hosts) in two different areas near Tromso, North-Norway. The environmental conditions at the two sites were different. The first area was a large sheltered mudflat with high density of common eider Somateria mollissima broods, while the other consisted of exposed rocky shores, with a high density of breeding gulls Larus sp. We found a total of eight species of trematodes. At the first site, the prevalence of trematodes with autonomic life-cycles (microphallids of the pygmaeus group), and with the common eider as the most frequent final host, was significantly higher than in the other study area. There were no significant differences between the areas for most trematodes with two intermediate hosts and one or two free living larval stages, most of which have gulls as final hosts. We argue that for eider trematodes the density of f...
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