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Taxonomic Structure and Endemism of the Bryozoan Fauna of the Arctic Region

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Abstract

The taxonomic structure of the bryozoan fauna of the Arctic region is updated based on analysis of retrospective and modern data. The current species list has increased at least by one third compared to previous information, which has also considerably affected the knowledge of the composition of genera and families. The most diverse order is cheilostomatous bryozoans, which accounts for 2/3 of all known species of this group in the Arctic. The most part of the bryozoan fauna of the Arctic consists of 12 families of cheilostomatous bryozoans, two families of cyclostomatous bryozoans, and one family of ctenostomatous bryozoans. The proportion of the Arctic endemics at the species level exceeds 20% of the total species in this group. A comparison of the taxonomic structure of regional faunas of bryozoans from ten areas of the Arctic region confirms the presence of narrower taxonomic spectra at different taxonomic levels in the Laptev and East Siberian Seas. At the same time, the proportion of endemic species is the highest there and exceeds 30%. The level of similarity of the regional faunas at different taxonomic levels was estimated. The change in the species-per-genus (S/G) ratio (“generic coefficient”) is tracked, the highest values of which are reported in areas influenced by both the Atlantic and Arctic water masses.

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ACKNOWLEDGMENTS

The author thanks B.I. Sirenko and S.G. Denisenko (Zoological Institute, Russian Academy of Sciences, St. Petersburg, Russia), S. Cochrane and M. Carroll (Akvaplan-NIVA, Tromsø, Norway), O.S. Tendal (National History Museum of Denmark, Copenhagen, Denmark); J. Sørensen (Kaldbak Marine Biological Laboratory, Faroe Islands); E. Thomsen (the Tromsø University Museum, Norway), and M.E. Blicher (Greenland Institute of Natural Resources, Nuuk, Greenland) for access to material and museum collections of bryozoans. The author is grateful to two reviewers for valuable remarks that improved the manuscript.

Funding

The study was conducted as a part of the State Assignment to the Laboratory of Marine Research of Zoological Institute, Russian Academy of Sciences, no. 1021051402797-9 “Invertebrate Taxonomy, Diversity, and Ecology in the Russian and Neighboring Waters of the World Ocean, Inland Water Bodies, and Wet Territories”.

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  1. Zoological Institute, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    N. V. Denisenko

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Correspondence to N. V. Denisenko.

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Translated by E. Kuznetsova

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Denisenko, N.V. Taxonomic Structure and Endemism of the Bryozoan Fauna of the Arctic Region. Paleontol. J. 56, 774–792 (2022). https://doi.org/10.1134/S003103012207005X

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