Disturbance and Ecologic Succession in an Upper Ordovician Cobble-Dwelling Hardground Fauna
Disturbance and Ecologic Succession in an Upper Ordovician Cobble-Dwelling Hardground Fauna
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上奥陶世卵石硬地动物群的干扰和生态演替
DOI：
10.1126/science.228.4699.575
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发表时间：
1985
期刊：
影响因子：
56.9
通讯作者：
Mark A. Wilson
中科院分区：
文献类型：
--
作者：
Mark A. Wilson
北方肯塔基州的奥陶纪硬地动物群提供了一个例子，从化石记录的物种多样性的维护周期性干扰的自生生态演替。发现结壳石灰石卵石的海洋无脊椎动物显示了从低多样性的先驱组合，通过高多样性协会的单种稳定的动物群落发展的顺序。所有的物种，包括后期演替的优势，存在于殖民化的早期阶段。卵石的周期性翻转杀死了结壳，并开辟了新的空间，在此基础上重新开始继承。这些干扰保持高多样性的结壳社区内的空间分布的限制最有效的空间竞争对手。
An Ordovician hardground fauna in northern Kentucky provides an example from the fossil record of the maintenance of species diversity by periodic disturbance of an autogenic ecologic succession. The marine invirtebrates found encrusting limestone cobbles show an order of community development from a low-diversity pioneer assemblage through a high-diversity association to a monospecific stable fauna. All species, including the late successional dominants, were present in the early stages of colonization. Periodic overturning of the cobbles killed the encrusters and opened up new spaces on which succession was reinitiated. These disturbances maintained high diversity within the encrusting community by limiting the spatial distribution of the most efficient space competitors.