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<p>Polychaetes are a dominant and functionally diverse infaunal group of marine soft-bottom ecosystems. Yet their diversity in the Weddell Sea remains poorly known. We investigated the composition of polychaete communities (taxonomic and functional identity) in two key regions: Antarctic Peninsula and Filchner Trough region. Sediment cores collected during three RV <i>Polarstern</i> expeditions (PS81, 96, 118), revealed 1,605 polychaete individuals from 34 families. We assigned them into 14 functional groups, based on their feeding, motility and movement type. Polychaete abundances were highest in the northwestern Weddell Sea and lowest at the deeper Filchner Trough sites. Across all sites, Paraonidae and Cirratulidae were the dominant families, while motile burrowing subsurface deposit feeders prevailed functionally. Cluster analyses distinguished six taxonomic and five functional community types, indicating heterogeneous community structures. Regional patterns were evident with Hesionidae, Opheliidae and Maldanidae more abundant around the Antarctic Peninsula, while Syllidae, Glyceridae and Lumbrineridae in the Filchner Trough region, underlining different ecological roles under different environmental conditions. Our results highlight the spatial variation of polychaete communities and emphasize the need to integrate taxonomic and functional perspectives to comprehensively assess the different facets of biodiversity and to support conservation efforts for vulnerable Weddell Sea ecosystems.</p>

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Infaunal polychaete communities from continental shelf areas around the Antarctic Peninsula and the Filchner Trough region (Weddell Sea)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月4日

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  • Friederike Weith,
  • Andreas Bick,
  • Kerstin Jerosch,
  • Hendrik Pehlke,
  • Ben Behrend,
  • Gritta Veit-Köhler,
  • Heike Link

摘要

Polychaetes are a dominant and functionally diverse infaunal group of marine soft-bottom ecosystems. Yet their diversity in the Weddell Sea remains poorly known. We investigated the composition of polychaete communities (taxonomic and functional identity) in two key regions: Antarctic Peninsula and Filchner Trough region. Sediment cores collected during three RV Polarstern expeditions (PS81, 96, 118), revealed 1,605 polychaete individuals from 34 families. We assigned them into 14 functional groups, based on their feeding, motility and movement type. Polychaete abundances were highest in the northwestern Weddell Sea and lowest at the deeper Filchner Trough sites. Across all sites, Paraonidae and Cirratulidae were the dominant families, while motile burrowing subsurface deposit feeders prevailed functionally. Cluster analyses distinguished six taxonomic and five functional community types, indicating heterogeneous community structures. Regional patterns were evident with Hesionidae, Opheliidae and Maldanidae more abundant around the Antarctic Peninsula, while Syllidae, Glyceridae and Lumbrineridae in the Filchner Trough region, underlining different ecological roles under different environmental conditions. Our results highlight the spatial variation of polychaete communities and emphasize the need to integrate taxonomic and functional perspectives to comprehensively assess the different facets of biodiversity and to support conservation efforts for vulnerable Weddell Sea ecosystems.