Canals and invasions: a review of the distribution of Marenzelleria (Annelida: Spionidae) in Eurasia, with a key to Marenzelleria species and insights on their relationshipsстатья
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Дата последнего поиска статьи во внешних источниках: 6 июля 2022 г.
Аннотация:Recent invasions of the North and Baltic Seas by three Marenzelleria species haveextensively altered benthic communities in the region. Despite several studies onthe morphology and biology of the worms, their morphological identifications are oftenchallenging. Here we summarize and map the available records of Marenzelleriafrom Eurasia, distinguishing those based on morphology versus molecular data.Based upon the genetic similarity (p = 0.08% for COI) between individuals fromthe Baltic Sea and individuals from the Barents and White Seas we propose, for thefirst time, a possible route for the invasion of the Baltic Sea by M. arctia from theWhite Sea through the White Sea–Baltic Sea Canal. At the same time, our analysisof the sequences of COI fragments showed a significant genetic distance (p = 4.28–4.29%) between individuals identified as M. arctia from the Baltic, Barents andWhite Seas and those from the Kara Sea. This genetic distance, as well as the isolatedestuarine habitats of these Arctic worms, and the large geographic distance betweenthe type locality of M. arctia in the Beaufort Sea (Alaska) and northern Europe,raise doubts about the conspecificity of North American, North European andNorthwest Pacific populations. We report M. neglecta for the first time for theBritish Isles (River Thames). We also review the evidence for the role of the BalticSea−Volga Canal and the Volga−Don Canal in facilitating the dispersal of M. neglectato the Caspian Sea and the Sea of Azov, respectively. We further provide new insighton the phylogeny of Marenzelleria, an updated diagnosis of the genus and a key formorphological identification of Marenzelleria adults greater than 1.2 mm wide.