Environmental Factors Controlling Community Structure , Morphology and Linear Extension of Mid-Holocene Reef Corals from Cañada Honda , Southwestern , Dominican Republic
Environmental Factors Controlling Community Structure , Morphology and Linear Extension of Mid-Holocene Reef Corals from Cañada Honda , Southwestern , Dominican Republic
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控制来自多米尼加共和国西南部加拿大宏达的全新世中期珊瑚礁群落结构、形态和线性延伸的环境因素
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发表时间：
2009
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通讯作者：
D. Hubbard
中科院分区：
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作者：
D. Cuevas;C. Sherman;W. Ramírez;D. Hubbard
位于多米尼加共和国西南部的Cañada本田（CH）化石珊瑚礁为研究9.0-5.0 ky前高沉积环境中的珊瑚礁增生提供了独特的机会。确定了化石珊瑚的年度线性延伸，以便与现代珊瑚礁的数据进行比较。珊瑚礁的特点是有大量耐沉积物的珊瑚物种，它们倾向于形成几乎单一的群落，并生长为边缘参差不齐的珊瑚锥。此外，Montastraea faveolata的殖民地通常包含在其骨骼内的沉积物带。珊瑚化石的放射性碳年龄范围为9，256 ±137至6，737 ±94.5 BP。与全新世海平面曲线的相关性表明，CH上的大多数珊瑚发育在大于15米的深度。增长率从0.09-0.44厘米/年不等，表明珊瑚生长在这样的深度造成的光穿透减少。礁沉积物的特征是85%以上的碳酸盐物质。碳酸盐的重要部分是他生的，来自附近的新近纪石灰岩。珊瑚礁之所以能够在这种条件下生存，是因为流入的陆源沉积物中碳酸盐含量很高，而且风暴可能偶尔发生，提供了中间的低沉积期，在此期间，珊瑚礁可以作出反应并重新生长，“跟上”沉积。
The Cañada Honda (CH) fossil coral reef, located in SW Dominican Republic, provides a unique opportunity to examine reef accretion in a high-sedimentation environment between 9.0-5.0 ky ago. Annual linear extension of fossil corals was determined for comparison with data from modern coral reefs. The reef is characterized by the high abundance of sediment-tolerant coral species, their tendency to form almost monospecific stands and grow as domes-cones with ragged margins. Also, colonies of Montastraea faveolata commonly contain bands of sediment incorporated within their skeletons. Calibrated radiocarbon ages of fossil corals range from 9,256±137 to 6,737±94.5 BP. Correlation with Holocene sea-level curves indicates that most corals on CH developed at depths greater than 15m. Growth rates varied from 0.09-0.44 cm/yr and suggest reduced light penetration caused by coral growth at such depths. Reef sediment is characterized by more than 85% carbonate material. A significant portion of the carbonate is allochtonous and was derived from nearby Neogene limestones. The reef was able to survive under these conditions because of the high carbonate content of incoming terrigenous sediment and that storms probably occurred sporadically providing intervening lowsedimentation periods during which reef corals could respond and grow back, “keeping-up” with sedimentation.