Gelatinous macrozooplankton diversity and distribution dataset for the North Sea and Skagerrak/Kattegat during January-February 2021

Køhler, Louise G.; Huwer, Bastian; Pujolar, José Martín; Werner, Malin; Wikström, Karolina; Wernbo, Anders; Ovegård, Maria; Jaspers, Cornelia

doi:10.1016/j.dib.2022.108493

Cited by 4 publications

(1 citation statement)

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“…However, once the conditions become less favourable (i.e., seasonal decrease of temperature and shortage of zooplankton prey), their numbers rapidly drop and usually cease by mid-winter. Some individuals may however survive the winter in the Kattegat and Skagerrak areas (Køhler et al 2022). For overwintering, M. leidyi were shown to migrate to greater depths with temperatures ranging from 4 to 8°C in the Bornholm Basin, central Baltic Sea (Kube et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Genetic structure of invasive ctenophore Mnemiopsis leidyi populations in temperate northern European waters supports the southern North Sea overwintering refuge

Lüskow,

Knudsen

2024

Preprint

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The ctenophore Mnemiopsis leidyi is native to the Atlantic coasts of the Americas and is considered a threat to biodiversity and food webs in introduced ecosystems. Most of these invasive ctenophores perish during the cold winter in temperate northern European waters (North and Baltic Seas), but spread again every summer/autumn. We collected ctenophores from the southern North Sea, inner Danish waters, and western Baltic Sea in 2017 and 2018, and sequenced genomic DNA obtained from tissue samples. We obtained sequences of internal transcribed spacer (ITS) 1 and 2, and the intervening 5.8S fragment and partial fragments of the flanking 18S rRNA and 28S rRNA genes from nuclear DNA (nDNA). These sequences were compared with ones archived in databases from specimens in its native (Northwest Atlantic) and other invaded habitats (Caspian Sea, Mediterranean Sea, central-western Atlantic Ocean). The comparison revealed no significant difference in genetic internal variation among temperate northern European sampling locations but showed variation when compared with native and other invaded habitats. No significant genetic difference was identified between specimens collected in the temperate northern European waters in the two consecutive years 2017 and 2018. The very low interregional and interannual genetic variations in M. leidyi specimens in the Northeast Atlantic indicate that its distribution in temperate northern European waters can be regarded as one single panmictic population and that the annual dispersal from the southeastern North Sea into the western Baltic Sea can be traced back to the same population, which most likely originates every spring from the Dutch Wadden Sea and the English Channel.

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Section: Discussionmentioning

confidence: 99%