Quantitative estimation of bioturbation based on digital image analysis
Quantitative estimation of bioturbation based on digital image analysis
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DOI：
10.1016/j.margeo.2014.01.003
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发表时间：
2014-03-01
期刊：
影响因子：
2.9
通讯作者：
Rodriguez-Tovar, Francisco J.
中科院分区：
文献类型：
--
作者：
Dorador, Javier;Rodriguez-Tovar, Francisco J.
通过生物活动（即生物扰动）对原始沉积物特征的改变进行定量测定在地球科学中是必不可少的。自20世纪60年代以来提出的一些方法主要基于视觉或主观判断。在最好的情况下，使用在不同情况下设计的一系列抽抽卡，尝试对生物扰动指数、Ichnofabric指数或生物扰动量进行第一次半定量评估。最近，更有效的方法包括使用分析和计算方法，如x射线、磁共振成像或计算机断层扫描；这些方法既复杂又昂贵。本文介绍了使用Adobe (R) Photoshop (R)软件CS6进行数字估计的不同方法的汇编，这些方法是IDIAP（技术数字分析图像包）的一部分，这是最近提出的方法的廉价替代方案，易于使用，特别推荐用于核心样品。不同的方法——“相似像素选择法（SPSM）”、“魔棒法（MWM）”和“颜色范围选择法（CRSM）”根据沉积物（如成分、颜色、纹理、孔隙度等）和技术特征（痕迹大小、填充材料、洞壁等）的不同，有各自的优缺点。IDIAP提供了对某一特定生物分类单元、整个生物群落甚至整个生物群落产生的痕量化石的估计。我们建议将完整的IDIAP应用于给定的案例研究，然后选择最合适的方法。将IDIAP应用于IODP 339号远征采集的岩心材料，使我们首次对岩心样品中的离散微量化石组合进行了定量估计。(C) 2014 Elsevier B.V.版权所有
Quantitative determination of modification of primary sediment features, by the activity of organisms (i.e., bioturbation) is essential in geosciences. Some methods proposed since the 1960s are mainly based on visual or subjective determinations. The first semiquantitative evaluations of the Bioturbation Index, Ichnofabric Index, or the amount of bioturbation were attempted, in the best cases using a series of flashcards designed in different situations. Recently, more effective methods involve the use of analytical and computational methods such as X-rays, magnetic resonance imaging or computed tomography; these methods are complex and often expensive. This paper presents a compilation of different methods, using Adobe (R) Photoshop (R) software CS6, for digital estimation that are a part of the IDIAP (Ichnological Digital Analysis Images Package), which is an inexpensive alternative to recently proposed methods, easy to use, and especially recommended for core samples. The different methods-"Similar Pixel Selection Method (SPSM)", "Magic Wand Method (MWM)" and the "Color Range Selection Method (CRSM)" entail advantages and disadvantages depending on the sediment (e.g., composition, color, texture, porosity, etc.) and ichnological features (size of traces, infilling material, burrow wall, etc.). The IDIAP provides an estimation of the amount of trace fossils produced by a particular ichnotaxon, by a whole ichnocoenosis or even for a complete ichnofabric. We recommend the application of the complete IDIAP to a given case study, followed by selection of the most appropriate method. The IDIAP was applied to core material recovered from the IODP Expedition 339, enabling us, for the first time, to arrive at a quantitative estimation of the discrete trace fossil assemblage in core samples. (C) 2014 Elsevier B.V. All rights reserved.