Benthic biotopes remote sensing using acoustics
Benthic biotopes remote sensing using acoustics
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DOI：
10.1016/s0022-0981(02)00536-1
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发表时间：
2003-02-12
影响因子：
2
通讯作者：
Quintino, V
中科院分区：
文献类型：
--
作者：
Freitas, R;Rodrigues, AM;Quintino, V
本研究通过结合水声和生物调查技术提供的信息，将新的方法应用于海底底栖生物群落的研究。利用海底声学分类系统QTC VIEW（TM）绘制了葡萄牙西海岸“Ria de Aveiro”陆架水深5 ~ 40的声学多样性图。通过对浅层沉积物粒度的分析，并与大型动物群落的物种组成和分布进行了比较，得出了基础真相。沉积和生物资料进行了排序分析，声学资料进行了排序和聚类分析。使用地理信息系统绘制了已确定的声学类别。声学结果显示非常清晰。地理格局，与声学分类是一致的调查线相交，确认分类程序的稳定性。在最佳劈裂水平下，得到了三个声学类。这些分类与粗砂、细砂和极细砂的差异有关。声学方法没有检测到粗砂类的粒度的其他实际底部差异，可能是因为它们显示出相似的密实度。底栖生物生态数据表明只有两个主要的群落，这对应于两类声学分裂的结果。因此，注意到最佳声学分裂与存在的主要生物群落数量之间的不匹配。然而，通过将声学解决方案降低到两类，实现了与底栖生物群落的最佳关系。总的来说，结果表明，声学系统为绘制软沉积物生物群落提供了非常有价值和重要的数据，即使是在相对单调的底部区域，如所分析的区域，但需要仔细的地面真相，以确保声学分类的分裂是生物学相关的。(C) 2002 Elsevier Science B.V.版权所有
The present work applies novel methodologies to the study of sublittoral benthic biotopes, by combining the information given by underwater acoustic and biological survey techniques. The acoustic seabed classification system QTC VIEW(TM) was used to map the acoustic diversity between 5 and 40 in water depth on the shelf off "Ria de Aveiro", Western coast of Portugal. Ground-truth was undertaken using an analysis of superficial sediments grain-size, and compared to the species composition and distribution of macrofaunal communities. Sedimentary and biological data were submitted to ordination analysis, and the acoustic data to both ordination and cluster analysis.The acoustic classes identified were mapped using a geographical information system. The acoustic results showed a very clear. geographic pattern, with the acoustic classification being coincident where survey lines crossed, confirming the stability of the classification procedure. At the optimal splitting level, three acoustic classes were obtained. These classes were correlated to differences in coarse, fine and very fine sands. Additional real bottom differences in the grain-size of the coarser sand classes were not detected by the acoustic method, possibly due to the fact that they showed a similar degree of compactness., The benthic ecological data suggests only two main communities, which correspond to the outcomes of a two-class acoustic split. Therefore, a mismatch was noticed between the optimal acoustic split and the number of major biological communities present. However, by dropping the acoustic solution down to two classes, an optimal relationship to benthic communities is achieved. Overall, results suggest that the acoustic system provides very valuable and important data for mapping soft sediment biotopes, even in areas of relative bottom monotony such as the one analysed, but careful ground-truth is required to ensure that the acoustic class splits are biologically relevant. (C) 2002 Elsevier Science B.V. All rights reserved.