The Burgess Shale paleocommunity with new insights from Marble Canyon, British Columbia
The Burgess Shale paleocommunity with new insights from Marble Canyon, British Columbia
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DOI：
10.1017/pab.2019.42
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发表时间：
2020-02-01
期刊：
影响因子：
2.7
通讯作者：
Gaines, Robert R.
中科院分区：
文献类型：
--
作者：
Nanglu, Karma;Caron, Jean-Bernard;Gaines, Robert R.
寒武纪中（五流期）伯吉斯页岩以其“厚”斯蒂芬组保存了丰富多样的软体动物而闻名。然而，除了沃尔科特采石场（化石岭）和地层较老的郁金香床（斯蒂芬山），它们都在Yoho国家公园（不列颠哥伦比亚省），对伯吉斯页岩的定量评估仍然有限。本文首先基于16,438个样本，对大理岩峡谷伯吉斯页岩地区的多样性和结构进行了详细的定量概述。大理石峡谷位于库特尼国家公园（不列颠哥伦比亚省）沃尔科特采石场东南40公里处，是“厚”斯蒂芬地层最年轻的遗址。然后，我们将来自大理石峡谷、沃尔科特采石场、郁金香床和雷蒙德采石场（位于沃尔科特采石场正上方约20米）的古生态数据集结合起来，得出了一个包含77179个标本的物种丰度数据集，包括234个物种级分类群。大理岩峡谷在分类学和生态类群上都表现出明显的时间变化，表明在局部和短时间尺度上，停滞期之后是快速的更替模式。在更广泛的地理和时间尺度上，不同的Burgess页岩地点在多元空间中占据不同的区域。总的来说，这表明伯吉斯页岩古群落比以前认为的要复杂得多，并且在“厚”斯蒂芬组的局部和区域尺度上都有所不同。这强调了我们对寒武纪多样性和生态网络，特别是早期动物生态系统的理解仍然有限，并且高度依赖于新的发现。
The middle (Wuliuan Stage) Cambrian Burgess Shale is famous for its exceptional preservation of diverse and abundant soft-bodied animals through the "thick" Stephen Formation. However, with the exception of the Walcott Quarry (Fossil Ridge) and the stratigraphically older Tulip Beds (Mount Stephen), which are both in Yoho National Park (British Columbia), quantitative assessments of the Burgess Shale have remained limited. Here we first provide a detailed quantitative overview of the diversity and structure of the Marble Canyon Burgess Shale locality based on 16,438 specimens. Located 40 km southeast of the Walcott Quarry in Kootenay National Park (British Columbia), Marble Canyon represents the youngest site of the "thick" Stephen Formation. We then combine paleoecological data sets from Marble Canyon, Walcott Quarry, Tulip Beds, and Raymond Quarry, which lies approximately 20 m directly above the Walcott Quarry, to yield a combined species abundance data set of 77,179 specimens encompassing 234 species-level taxa. Marble Canyon shows significant temporal changes in both taxonomic and ecological groups, suggesting periods of stasis followed by rapid turnover patterns at local and short temporal scales. At wider geographic and temporal scales, the different Burgess Shale sites occupy distinct areas in multivariate space. Overall, this suggests that the Burgess Shale paleocommunity is far patchier than previously thought and varies at both local and regional scales through the "thick" Stephen Formation. This underscores that our understanding of Cambrian diversity and ecological networks, particularly in early animal ecosystems, remains limited and highly dependent on new discoveries.