Coral assemblages, biofacies, and ecological zones in the mid-Holocene reef deDosits of the Enriquillo Valley, Dominican Republic
Coral assemblages, biofacies, and ecological zones in the mid-Holocene reef deDosits of the Enriquillo Valley, Dominican Republic
复制标题
多米尼加共和国恩里基洛山谷全新世中期珊瑚礁的珊瑚组合、生物相和生态区
DOI：
--
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
K. Johnson
中科院分区：
文献类型：
--
作者：
T. Stemann;K. Johnson
Stemann, T. A. & Johnson, K. G. 1992 07 15：珊瑚组合，生物相。和多米尼加共和国恩里基略山谷全新世中期珊瑚礁沉积物的生态区。
恩里基略山谷（多米尼加共和国西南部）的一个大型、暴露于地下的全新世中期珊瑚礁为研究珊瑚礁生态和珊瑚礁沉积物之间的关系提供了绝佳的机会。恩里基洛礁的珊瑚物种丰富度和多样性与近代加勒比海的珊瑚物种相当，由浅水分支珊瑚区和深水混合珊瑚区组成的生态区带很明显。在中等波浪暴露的加勒比活珊瑚礁上也发现了类似的分区和多样性模式。使用常用于普查现代珊瑚礁的样方点计数技术，可以在恩里基洛沉积物中区分三种统计上离散的生物特征。它们包括以 Acropora cervicornis 为主的相、具有丰富、大型 Siderastrea siderea 和 Stephanocoenia intersepta 群落的低多样性组合，以及由包括 Montastraea spp.、Colpophyllia spp. 和 Agaricia spp. 在内的各种类群组成的较高多样性组合。每个相的识别规模为 1-3 m2，但在某些情况下，它们的范围会超过 20 m2。一般来说，A. cervicornis 相在空间上与其他两个生物相隔离。尽管浅水生态区和深水生态区都不由单一的珊瑚礁生物相组成。相反，这里描述的生物相似乎代表了次区域尺度生态变化所产生的独特微环境。类似规模的微环境很可能保存在其他珊瑚礁沉积物中。对这些次带生物相的认识可能对化石礁的地层学和古生态学解释产生重要影响。珊瑚、生物相、珊瑚礁分区、珊瑚群落、化石礁。
Stemann, T. A. & Johnson, K. G. 1992 07 15: Coral assemblages, biofacies. and ecological zones in the mid-Holocene reef deposits of the Enriquillo Valley, Dominican Republic.
A large, subaerially exposed mid-Holocene reef in the Enriquillo Valley (southwest Dominican Republic) provides an excellent opportunity to examine the relationship between reefal ecology and reefal deposits. Coral species richness and diversity in the Enriquillo reef are comparable to that found in the recent of the Caribbean, and ecological zonation comprised of a shallow-water branching coral zone and a deeper water mixed-coral zone is apparent. Similar zonation and diversity patterns have been recognized on living Caribbcan reefs with moderate wave exposure. Three statistically discrete biopdcies can be discriminated in the Enriquillo deposits using quadrat point-counting techniques commonly used to census modern reefs. They include a facies dominated by Acropora cervicornis, a low diversity assemblage with abundant, large colonies of Siderastrea siderea and Stephanocoenia intersepta, and a higher diversity assembbdge composed of various taxa including Montastraea spp., Colpophyllia spp., and Agaricia spp. Each facies can be recognized at scales of 1–3 m2, though in some cases they extend for more than 20 m2. In general, the A. cervicornis facies is spatially segregated from the other two biofacies. although neither the shallow nor the deep-water ecological zone is comprised of a single reef biofacies. Rather, the biofacies described here appear to represent distinct micro-environments resulting from ecological variation at a subzonal scale. Micro-environments of similar scale are most likely preserved in other reef deposits. Recognition of these subzonal biofacies may have important consequences for the stratigraphical and paleoccological interpretation of fossil reefs. Corals, biofacies, reef zonation, coral communities, fossil reefs.