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首页> 外文学位 >The interactions of vermetid gastropod reef development and sea-level fluctuations on late Holocene coastal geomorphology and environmental evolution of the Ten Thousand Islands, Florida.
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The interactions of vermetid gastropod reef development and sea-level fluctuations on late Holocene coastal geomorphology and environmental evolution of the Ten Thousand Islands, Florida.

机译：佛罗里达州万岛群岛晚全新世沿海地貌和环境演化的准腹足动物礁发育和海平面波动相互作用。

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摘要

The carbonate-producing coastline of Southwest Florida attributes its geomorphology to oyster and vermetid reef construction, which in turn becomes substrate for mangrove forest progradation. Understanding the unique development process of the mangrove-forested islands is crucial to the management of this ecosystem. This study aims to understand the constraints placed on Holocene vermetid reef development by the physical environment and the living ecology. The historic distribution of oyster reefs landward and vermetid reefs seaward may be a result of a well-defined salinity gradient. Reef history extends 3,850 yBP into the Holocene, providing potential for sea-level interpretations. Twelve sediment cores were taken with this study. Altogether, they illustrate a transgressive/regressive sequence. Sedimentology and elevation data suggest vermetid reef growth closely mimics the patterns of mid- to late-Holocene sea-level rise and seaward progradation of the shoreline. Vermetus nigricans is the vermetid gastropod responsible for this wave-resistant framework, which often includes incorporation of Crassostrea virginica and barnacles. A geomorphologic study shows that relict vermetid reefs play a unique role in shaping the mangrove islands when compared to the same function of relict oyster reefs as frame-builders. Morphologies of vermetid reef construction through time and space vary as a response to environmental stimuli. Salinity and sedimentology are significant controls on distinct changes in vermetid reef morphology. V. nigricans is a low-intertidal sea-level indicator, and radiocarbon dating of the vermetids reveals no evidence of a local sea-level highstand. However, evidence is presented for an unsmooth sea-level curve, with a possible drawdown event occurring at approximately 2,500 yBP.
机译：佛罗里达西南部生产碳酸盐的海岸线将其地貌归因于牡蛎和and石礁的建设，而后者又成为红树林生长的基础。了解由红树林环绕的岛屿的独特发展过程对于管理该生态系统至关重要。这项研究旨在了解物理环境和生物生态系统对全新世Vermetid礁发展的限制。牡蛎礁向内陆和淡淡礁石向海的历史分布可能是盐度梯度明确的结果。珊瑚礁的历史将3,850 yBP扩展到全新世，为海平面解释提供了潜力。这项研究采用了十二个沉积物岩心。它们总共说明了一个海侵/回归序列。沉积学和海拔数据表明，ver石礁的生长与新石器时代中期至晚期海平面上升和海岸线向海前进的方式极为相似。黑曲霉（Vermetus nigricans）是导致这种抗波框架的蠕虫型腹足纲动物，通常包括Crassostrea virginica和藤壶的结合。一项地貌学研究表明，与遗迹牡蛎礁与框架构建者相同的功能相比，遗迹深层礁石在塑造红树林中起着独特的作用。穿越时间和空间的礁石构造形态随环境刺激而变化。盐度和沉积学是对准生物礁形态变化的重要控制。 V. nigricans是潮间带低潮的指标，对met体的放射性碳测年表明没有当地海平面高位的证据。但是，已经提供了海平面曲线不平滑的证据，可能的下降事件发生在大约2500 yBP。

著录项

  • 作者

    Fronczkowski, Nicole A.;

  • 作者单位

    Florida Gulf Coast University.;

  • 授予单位 Florida Gulf Coast University.;
  • 学科 Geomorphology.;Paleoecology.;Sedimentary Geology.
  • 学位 M.S.
  • 年度 2013
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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