Invasive Species Compendium

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Abstract

The helminth fauna of an isolated Black Sea population of the common eider Somateria mollissima.

Abstract

23 Somateria mollissima of various ages, caught on islands in the Black Sea, Ukraine, were examined for helminths. 32 species of helminths were collected, and these are listed with information on prevalence, intensity of infection and other hosts. The core of the fauna included 15 species (9 digenean, 4 cestode and 2 nematode species) of which Microsomacanthus microskrjabini, Microphallus pygmaeus and Cryptocotyle concavum were dominant. In contrast to other species of local ducks, young S. mollissima had a low prevalence of infection and the main helminth population was concentrated in birds aged 1 to 1.5 years. Comparison of the helminth fauna of S. mollissima populations in the White and Barents Sea, with the Black Sea population showed that the Black Sea fauna comprised 3 groups: specific parasites of the eider imported by the founders of the colony (Fimbriarioides intermedia and Microsomacanthus heterospinus); 11 species common to eiders in Northern Europe and in the Black Sea; 17 species acquired by S. mollissima from local birds (12 representing new host records: Psilostomum longicirratus, P. oxyuris, P. skrjabini, Notocotylus seineti, N. skrjabini, Paramonostomum anatis, P. bucephalae, P. pseudoalveatum, Gynaecotyla longiintestinata, Maritrema echinocirrata, Apophallus muehlingi and Capillaria anatis).