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首页> 外文期刊>Journal of the Geological Society >Co-occurrence patterns of ice-rafted dropstones and brachiopods in the Middle Permian Wandrawandian Siltstone of the southern Sydney Basin (southeastern Australia) and palaeoecological implications
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Co-occurrence patterns of ice-rafted dropstones and brachiopods in the Middle Permian Wandrawandian Siltstone of the southern Sydney Basin (southeastern Australia) and palaeoecological implications

机译：悉尼盆地南部（澳大利亚东南部）和古生学暗示中二叠系万天大楼砂岩中的冰筏滴石和砂岩砂岩的共同发生模式

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摘要

The ecological significance of ice-rafted dropstones in present-day glacial marine benthic environments has received considerable attention from ecologists, but similar studies based on the geological records of dropstones and associated fossils are rare. In this study, we report statistically significant co-occurrences of ice-rafted dropstones with brachiopod shells in multiple stratigraphic horizons at multiple sites from the Middle Permian Wandrawandian Siltstone of the southern Sydney Basin in southeastern Australia. We analysed the distribution patterns of both dropstones and brachiopod-dominated fossil assemblages by using a quadrat-based sampling method and spatial point pattern analysis. It was revealed that the co-occurrences of ice-rafted dropstones and brachiopod shells are not random; rather, they demonstrate statistically significant and stratigraphically recurring associations that are here interpreted to represent dropstone-associated, brachiopod-dominated palaeoecological communities. In these recurring palaeocommunities, the presence of ice-rafted dropstones is considered to have added habitat complexity and heterogeneity to the benthic environment, especially suited to the settlement of brachiopods. In addition, the sinking of dropstones, from floating ice masses through the water column to the silty seafloor, is interpreted to have enriched the nutrient and oxygen supply to the benthic environment, further aiding the flourishing and maintenance of a diverse and stable marine benthic fauna.
机译：冰蔓延滴剂在现今冰川海洋底栖环境中的生态意义受到了生态学家的相当大的关注，但基于滴石和相关化石的地质记录的类似研究很少见。在这项研究中，我们在澳大利亚南部南部南部南部南部南部南部的多个站点的多个地段中，在多个地层视野中举报了统计上显着的冰圆形泡沫壳。通过使用基于四边的采样方法和空间点模式分析，通过使用基于四边的采样方法和空间点模式分析来分析了滴剂和布基孔主导化石组合的分布模式。据透露，冰塑料的滴石和布拉米鳕壳的共同发生是不随意的;相反，它们展示了统计上重要的和地层复杂的关联，这里被解释为代表滴石相关的血小板主导的古生学社区。在这些反复出现的古社会中，冰蔓延滴石的存在被认为已经向底栖环境添加了栖息地复杂性和异质性，特别适用于灌木opods的沉降。此外，从浮动冰块通过水柱到粉质海底的沉没，被解释为对底栖环境的营养和氧气供应，进一步实现了多样化和稳定的海洋底栖动物的繁荣和维护。

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  • 来源
    《Journal of the Geological Society》 |2018年第5期|共15页
  • 作者

    Yang Bo; Shi G. R.; Lee Sangmin; Luo Mao;

  • 作者单位

    Deakin Univ Australia Sch Life &

    Environm Sci Ctr Integrat Ecol 221 Burwood Highway Burwood Vic 3125 Australia;

    Deakin Univ Australia Sch Life &

    Environm Sci Ctr Integrat Ecol 221 Burwood Highway Burwood Vic 3125 Australia;

    Deakin Univ Australia Sch Life &

    Environm Sci Ctr Integrat Ecol 221 Burwood Highway Burwood Vic 3125 Australia;

    Deakin Univ Australia Sch Life &

    Environm Sci Ctr Integrat Ecol 221 Burwood Highway Burwood Vic 3125 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
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