Molecular analyses reveal high species diversity of trematodes in a sub-Arctic lake

International Journal for Parasitology
By: , and 



To identify trematode diversity and life-cycles in the sub-Arctic Lake Takvatn, Norway, we characterised 120 trematode isolates from mollusc first intermediate hosts, metacercariae from second intermediate host fishes and invertebrates, and adults from fish and invertebrate definitive hosts, using molecular techniques. Phylogenies based on nuclear and/or mtDNA revealed high species richness (24 species or species-level genetic lineages), and uncovered trematode diversity (16 putative new species) from five families typical in lake ecosystems (Allocreadiidae, Diplostomidae, Plagiorchiidae, Schistosomatidae and Strigeidae). Sampling potential invertebrate hosts allowed matching of sequence data for different stages, thus achieving molecular elucidation of trematode life-cycles and exploration of host-parasite interactions. Phylogenetic analyses also helped identify three major mollusc intermediate hosts (Radix balthica, Pisidium casertanum and Sphaerium sp.) in the lake. Our findings increase the known trematode diversity at the sub-Arctic Lake Takvatn, showing that digenean diversity is high in this otherwise depauperate sub-Arctic freshwater ecosystem, and indicating that sub-Arctic and Arctic ecosystems may be characterised by unique trematode assemblages.

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Publication type Article
Publication Subtype Journal Article
Title Molecular analyses reveal high species diversity of trematodes in a sub-Arctic lake
Series title International Journal for Parasitology
DOI 10.1016/j.ijpara.2016.12.008
Volume 47
Issue 6
Year Published 2017
Language English
Publisher Elsevier
Contributing office(s) Western Ecological Research Center
Description 19 p.
First page 327
Last page 345
Country Norway
Other Geospatial Lake Takvatn
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