Change in the degree of infestation of parasitic nematodes in Grey Seals Halichoerus grypus from Froan, Norway

Change in nematode infestation in stomachs of Grey Seals caught at the breeding ground at Froan on the coast of Sør-Trøndelag county, Norway, is recorded. The abundance of nematodes decreased from 1977/78 to 1982/84. In the first period more than 50% of the seals had more that 1000 nematodes wherea...

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