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Same (sea) bed different dreams: Biological community structure of the Haima seep reveals distinct biogeographic affinities

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    1. A total of 65 macrofauna were found at the Haima seep, and 35 of them appear endemic to this area.

      Sediment-rich vents are in intermediate habitats between seeps and hard-substrate vents.

      Seep communities in the South China Sea and the North Indian Ocean are closely related.

      The rich and endemic biodiversity at Haima calls for conservation measures.

  • Deep-sea chemosynthetic communities, including hydrothermal vents and cold seeps, harbour hundreds of endemic species currently threatened by deep-sea mining and hydrocarbon extraction. The South China Sea (SCS), a semi-enclosed marginal sea with two well-investigated active seeps (Haima in the west and Site F in the east), provides an opportunity to understand the biogeography of chemosynthetic ecosystems. Here, we conducted extensive field surveys using Remotely Operated Vehicles (ROVs) and collected specimens for morphological observations, molecular barcoding, phylogenetic analysis, and stable isotope analysis. Cluster analyses were applied to reveal the community structure of vents and seeps in the Western Pacific and Northern Indian Ocean. A total of 65 species covering seven phyla and 14 classes have been identified from Haima, doubling the number of species reported previously. Among them, 35 species are currently known only from Haima. Stable isotope analysis shows a typical chemosynthesis-based biological community. Community structure analysis at the genus level clustered Haima with Site F, though the species compositions and dominance of two seeps are fairly distinct. Between the two active seeps in the SCS, the higher species richness and endemism at Haima are potentially due to multiple factors, including the unique environmental factors there and the geographic isolation in the northwestern corner of the SCS. Moreover, a similarity in community compositions at the genus level between seeps in the SCS and North Indian Ocean was revealed, potentially mediated by the Early Pliocene opening of the Indonesian islands and the strong westward Indonesia Throughflow. Given the ongoing gas hydrate exploration activities in the SCS, our results will contribute to establishing a global network of marine protected areas for chemosynthetic-based ecosystems. The rich and endemic biodiversity at Haima calls for policymakers to formulate regulations to conserve the unique biodiversity there.
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  • Cite this article:

    He X., Xu T., Chen C., et al., (2023). Same (sea) bed different dreams: Biological community structure of the Haima seep reveals distinct biogeographic affinities. The Innovation Geoscience 1(2), 100019. https://doi.org/10.59717/j.xinn-geo.2023.100019
    He X., Xu T., Chen C., et al., (2023). Same (sea) bed different dreams: Biological community structure of the Haima seep reveals distinct biogeographic affinities. The Innovation Geoscience 1(2), 100019. https://doi.org/10.59717/j.xinn-geo.2023.100019

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