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<b>Abstract</b>— <p>Video transects were obtained using a towed underwater vehicle “Videomodule” in Blagopoluchiya, Tsivolki, Oga, Sedov, and Rusanov bays (Novaya Zemlya Archipelago, the Kara Sea) in 2016–2024 as part of the “Ecosystems of the Siberian Arctic Seas” project. A quantitative analysis of the dominant megafaunal organisms along with the description of their communities were conducted. In 2016, the communities dominated by <i>Ophiacantha bidentata</i> and suspension feeders prevailed in the outer parts of the bays and on the slope on dense and rocky bottoms. In the inner parts of the bays on silty sediments the communities were dominated by <i>Ophiopleura borealis</i>. The current state of the megafauna in all studied bays differs drastically from the community structure observed ten years ago. These changes are assosiated with the snow crab invasion. The megafauna abundance dropped in 10–30 times, while the proportion of snow crabs in terms of abundance increased to 30–80%. The brittle stars <i>Ophiacantha bidentata</i> and <i>Ophiopleura borealis</i>, which dominated numerically in 2016, have disappeared. At depth of 60–100 m, <i>Ophiopleura borealis</i>-dominated communities were replaced by communities dominated by the snow crab and <i>Gersemia</i> spp., and at 150–250 m by communities dominated by the snow crab, sea anemones, and <i>Urasterias lincki</i>.</p>

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Spatiotemporal Changes in the Megafauna of the Novaya Zemlya Bays (the Kara Sea) over the Last Decade: Results from Video Surveys

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • A. A. Udalov,
  • I. M. Anisimov,
  • S. V. Galkin,
  • A. K. Zalota,
  • A. V. Lesin,
  • V. O. Muravya,
  • A. A. Pronin,
  • M. V. Chikina

摘要

Abstract—

Video transects were obtained using a towed underwater vehicle “Videomodule” in Blagopoluchiya, Tsivolki, Oga, Sedov, and Rusanov bays (Novaya Zemlya Archipelago, the Kara Sea) in 2016–2024 as part of the “Ecosystems of the Siberian Arctic Seas” project. A quantitative analysis of the dominant megafaunal organisms along with the description of their communities were conducted. In 2016, the communities dominated by Ophiacantha bidentata and suspension feeders prevailed in the outer parts of the bays and on the slope on dense and rocky bottoms. In the inner parts of the bays on silty sediments the communities were dominated by Ophiopleura borealis. The current state of the megafauna in all studied bays differs drastically from the community structure observed ten years ago. These changes are assosiated with the snow crab invasion. The megafauna abundance dropped in 10–30 times, while the proportion of snow crabs in terms of abundance increased to 30–80%. The brittle stars Ophiacantha bidentata and Ophiopleura borealis, which dominated numerically in 2016, have disappeared. At depth of 60–100 m, Ophiopleura borealis-dominated communities were replaced by communities dominated by the snow crab and Gersemia spp., and at 150–250 m by communities dominated by the snow crab, sea anemones, and Urasterias lincki.