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<p>Assemblages of modern benthic foraminifera and their qualitative and quantitative distribution patterns were studied at three sites (A, B and C) in the intertidal zone of Sishili Bay, northern Yellow Sea, China. A total of 46 species of foraminifera from 22 genera and 15 families were identified. Assemblages were dominated by calcareous forms (35 species), with Ammoniidae as the most abundant family. Of the 11 agglutinated foraminiferal species, two species from the families Trochamminidae and Miliamminidae distributed widely in the Sishili Bay. The proportion of live individuals relative to total density showed spatial difference due to bottom sediments type, reaching 82% at Site A, 30% at Site B and 13%–15% at Site C. Rare living individuals of <i>Ammonia</i> cf. <i>A. beccarii</i> bearing minute algae attachments on both the dorsal and ventral surfaces of the tests were observed at silty/sandy inter-tidal Site A. Foraminiferal density was related to sediment characteristics, with highest values in very fine sand and lowest values in coarse/medium sand. Differentiation among the three sites was confirmed by ANOSIM (<i>R</i>=0.942, <i>P</i>&lt;0.05). Four assemblages clusters were detected by <i>n</i>-MDS analysis: Cluster 1 (six stations at Site A) characterized by high densities and <i>Ammonia</i> dominance (about 80%); Cluster 2 (three stations at Site A) presented with low densities but remained <i>Ammonia</i> dominance; Cluster 3 (three stations at Site B) exhibited the lowest density without any pronounced foraminifera dominance and Cluster 4 (two stations at Site C) showed higher diversity and abundance without a dominant taxon.</p>

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Benthic Fauna of Foraminifera and Their Distribution Pattern in Sishili Bay, Northern Yellow Sea, China

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Tatyana S. Tarasova,
  • Baoquan Li,
  • Yulia A. Trebukhova,
  • Ilia A. Shcherbakov,
  • Aleksandra V. Romanova,
  • Konstantin A. Lutaenko,
  • Jiao Wang,
  • Jing Chen,
  • Linlin Chen

摘要

Assemblages of modern benthic foraminifera and their qualitative and quantitative distribution patterns were studied at three sites (A, B and C) in the intertidal zone of Sishili Bay, northern Yellow Sea, China. A total of 46 species of foraminifera from 22 genera and 15 families were identified. Assemblages were dominated by calcareous forms (35 species), with Ammoniidae as the most abundant family. Of the 11 agglutinated foraminiferal species, two species from the families Trochamminidae and Miliamminidae distributed widely in the Sishili Bay. The proportion of live individuals relative to total density showed spatial difference due to bottom sediments type, reaching 82% at Site A, 30% at Site B and 13%–15% at Site C. Rare living individuals of Ammonia cf. A. beccarii bearing minute algae attachments on both the dorsal and ventral surfaces of the tests were observed at silty/sandy inter-tidal Site A. Foraminiferal density was related to sediment characteristics, with highest values in very fine sand and lowest values in coarse/medium sand. Differentiation among the three sites was confirmed by ANOSIM (R=0.942, P<0.05). Four assemblages clusters were detected by n-MDS analysis: Cluster 1 (six stations at Site A) characterized by high densities and Ammonia dominance (about 80%); Cluster 2 (three stations at Site A) presented with low densities but remained Ammonia dominance; Cluster 3 (three stations at Site B) exhibited the lowest density without any pronounced foraminifera dominance and Cluster 4 (two stations at Site C) showed higher diversity and abundance without a dominant taxon.