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首页> 美国卫生研究院文献>other >Determining the Extent and Characterizing Coral Reef Habitats of the Northern Latitudes of the Florida Reef Tract (Martin County)
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Determining the Extent and Characterizing Coral Reef Habitats of the Northern Latitudes of the Florida Reef Tract (Martin County)

机译：确定范围和特征化佛罗里达礁区（马丁县）北纬度的珊瑚礁栖息地

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摘要

Climate change has recently been implicated in poleward shifts of many tropical species including corals; thus attention focused on higher-latitude coral communities is warranted to investigate possible range expansions and ecosystem shifts due to global warming. As the northern extension of the Florida Reef Tract (FRT), the third-largest barrier reef ecosystem in the world, southeast Florida (25–27° N latitude) is a prime region to study such effects. Most of the shallow-water FRT benthic habitats have been mapped, however minimal data and limited knowledge exist about the coral reef communities of its northernmost reaches off Martin County. First benthic habitat mapping was conducted using newly acquired high resolution LIDAR bathymetry and aerial photography where possible to map the spatial extent of coral reef habitats. Quantitative data were collected to characterize benthic cover and stony coral demographics and a comprehensive accuracy assessment was performed. The data were then analyzed in a habitat biogeography context to determine if a new coral reef ecosystem region designation was warranted. Of the 374 km2 seafloor mapped, 95.2% was Sand, 4.1% was Coral Reef and Colonized Pavement, and 0.7% was Other Delineations. Map accuracy assessment yielded an overall accuracy of 94.9% once adjusted for known map marginal proportions. Cluster analysis of cross-shelf habitat type and widths indicated that the benthic habitats were different than those further south and warranted designation of a new coral reef ecosystem region. Unlike the FRT further south, coral communities were dominated by cold-water tolerant species and LIDAR morphology indicated no evidence of historic reef growth during warmer climates. Present-day hydrographic conditions may be inhibiting poleward expansion of coral communities along Florida. This study provides new information on the benthic community composition of the northern FRT, serving as a baseline for future community shift and range expansion investigations.
机译：最近，气候变化与包括珊瑚在内的许多热带物种的极地转移有关。因此，有必要将注意力集中在高纬度的珊瑚群落上，以调查由于全球变暖而可能引起的范围扩展和生态系统变化。作为世界第三大堡礁生态系统佛罗里达礁区（FRT）的北部延伸，佛罗里达东南部（北纬25–27°）是研究此类影响的主要地区。大多数浅水FRT底栖生境都已绘制了地图，但是关于其最北端的马丁县附近的珊瑚礁群落的数据很少，了解也很有限。首先使用新近获得的高分辨率激光雷达测深仪和航空摄影进行底栖生物栖息地制图，并可能在地图上绘制珊瑚礁栖息地的空间范围。收集定量数据以表征底栖生物和石质珊瑚的人口统计资料，并进行了全面的准确性评估。然后在栖息地生物地理环境中分析数据，以确定是否有必要指定新的珊瑚礁生态系统区域。在绘制的374 km 2 海底中，沙质占95.2％，珊瑚礁和殖民化路面占4.1％，其他划分占0.7％。对已知的地图边际比例进行调整后，地图准确性评估得出的总体准确性为94.9％。跨架生境类型和宽度的聚类分析表明，底栖生境不同于南部生境，因此有必要指定一个新的珊瑚礁生态系统区域。与更南边的FRT不同，珊瑚群落以耐冷水物种为主，LIDAR形态表明在温暖气候下没有历史性礁石生长的迹象。当前的水文状况可能会抑制佛罗里达州珊瑚群落的极地扩张。这项研究提供了有关北FRT底栖生物群落组成的新信息，可作为未来群落转移和范围扩展研究的基准。

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    Brian K. Walker; David S. Gilliam;

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  • 年(卷),期 -1(8),11
  • 年度 -1
  • 页码 e80439
  • 总页数 16
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