Discovery of Dense Aggregations of Stalked Crinoids in Izu-Ogasawara Trench, Japan
Discovery of Dense Aggregations of Stalked Crinoids in Izu-Ogasawara Trench, Japan
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DOI：
10.2108/zsj.26.406
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
T. Oji;Y. Ogawa;A. Hunter;K. Kitazawa
中科院分区：
文献类型：
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作者：
T. Oji;Y. Ogawa;A. Hunter;K. Kitazawa
有柄海百合被认为是活化石，通常生活在现代超过100米的深水环境中。以前的记录，从超深（超过6000米）的有柄海百合是非常罕见的，没有原位的信息已被提供。我们在这里显示，柄海百合密集地生活在岩石基板在深度超过9000米的伊豆小笠原海沟日本东海岸，证明了水下照片和视频拍摄的远程操作的车辆。这是对海百合的最深的原位观察，表明海百合草甸可以存在于接近最深海底的深渊深度，与在较浅深度观察到的种群非常相似。
Stalked crinoids are recognized as living fossils that typically inhabit modern deep-water environments exceeding 100 m. Previous records of stalked crinoids from hadal depths (exceeding 6000 m) are extremely rare, and no in-situ information has been available. We show here that stalked crinoids live densely on rocky substrates at depths over 9000 m in the Izu-Ogasawara Trench off the eastern coast of Japan, evidenced by underwater photos and videos taken by a remotely operated vehicle. This is the deepest in-situ observation of stalked crinoids and demonstrates that crinoid meadows can exist at hadal depths close to the deepest ocean floor, in a fashion quite similar to populations observed in shallower depths.