A "quick and clean" photographic method for the description of coral reef habitats
A "quick and clean" photographic method for the description of coral reef habitats
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DOI：
10.1016/j.jembe.2008.10.002
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发表时间：
2009-01-31
影响因子：
2
通讯作者：
Pelletier, D.
中科院分区：
文献类型：
--
作者：
Dumas, P.;Bertaud, A.;Pelletier, D.
在过去十年中，使用基于水下呼吸器的照片/视频方法来表征珊瑚礁栖息地越来越受欢迎，但很少有工作研究表面摄影的潜力，以提供准确，可靠的栖息地配置文件对比栖息地。因此，在新喀里多尼亚西南泻湖的对比珊瑚礁群落区（礁坪、礁顶、桑迪底部）浮潜，进行了照片样带，以制定和测试一种“快速和清洁”的方法，适用于处理监测以及面向研究的方案。照片由潜水员使用标准的8 Mpixel水下数码相机从12个（20 x 1 m）礁顶/礁平/软底断面的表面拍摄。植被的特点是覆盖率为15类与沉积物类型和基质覆盖率有关的当地生境变量。详尽的面积分析，使用计算机辅助人工数字化，提供可靠的栖息地配置文件的数字图片。随后将结果与从随机分层点计数技术获得的表面估计值进行比较，点的数量在每平方米1到99之间。基于抽样的随机化技术使我们能够提供稳健，可靠的统计估计的准确性和精密度超过1000随机自举重复每样带。结果强调，无论礁群落生境如何，在样带尺度上都具有很高的准确度和精确度，在几乎所有情况下，与参考值的最大偏差都接近1%的覆盖率，
The use of scuba-based photo/video methods for characterizing coral reef habitats has gained increased popularity within the last decade, but few work examined the potentiality of surface photography to provide accurate, reliable habitat profiles in contrasted habitats. Photo transects were thus conducted by snorkeling in contrasted reef biotopes (reef flat, reef crest, sandy bottom) from the south-west lagoon of New Caledonia, to develop and test a "quick and clean" approach suitable for addressing monitoring as well as research-oriented programs. Pictures were taken by a snorkeler from the surface over twelve (20 x 1 m) reef crest/reef flat/soft bottoms transects using a standard 8 Mpixel digital-camera with underwater housing. Habitats were characterized from percent covers for 15 categories of local habitat variables related to sediment type and substrate coverage. Exhaustive area analyses using computer-assisted manual digitalizing were used to provide reliable habitat profiles from the digital pictures. Results were subsequently compared with surface estimates derived from random stratified point count techniques, for numbers of points comprised between I and 99 per m(2). Sampling-based randomization techniques allowed us to provide robust, reliable statistical estimates of accuracy and precision over 1000 randomized bootstrap replicates per transect. Results emphasized high accuracy and precision at transect scale whatever the reef biotopes considered, with maximum deviations from reference values of similar to 1 percent cover in almost all cases and associated variances