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首页> 外文期刊>Facies >Comparative taphonomy of three bivalve species from a mass shell accumulation in the intertidal regime of North Sea tidal flats
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Comparative taphonomy of three bivalve species from a mass shell accumulation in the intertidal regime of North Sea tidal flats

机译：北海潮滩潮间带大块壳堆积中三种双壳类的比较分异

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摘要

This study comprises a comparative taphonomic analysis of three endobenthic bivalves (Mya arenaria, Cerastoderma edule, and Macoma balthica) derived from a mass accumulation of mainly vertically packed shells from the "Wurster Watt" in Lower Saxony's Wadden Sea, German Bight. Bulk samples from two transects were analyzed with respect to taxonomic composition, left/right valve presence, counts and weight percentages of taxa, and size-frequency distributions. Taphonomic features including abrasion, fragmentation, encrustation and bioerosion were subjected to a semi-quantitative analysis. Taphonomic results show significant differences with respect to bivalve taxa as well as between transects. Mya arenaria, a large endobenthic bivalve, shows the greatest amount of fragmentation and is often encrusted by balanids and bryozoans. The smaller and more robust Cerastoderma edule has the greatest values for bioerosion especially by the polychaete Polydora ciliata. Macoma balthica, which has the thinnest valves, shows the highest values for abrasion, but low values for the rest of the measured taphonomic features. Taphonomic differences between the taxa, samples and transects are related to (1) the origin of the bivalves (from living populations or exposed colonization horizons), (2) the different size and morphology of the valves (themselves related to mode of life), (3) the taphonomic trajectories of the different bivalves, as well as (4) the varying depositional environment of the two transects.
机译：这项研究包括对三个内苯的双壳类动物（Mya arenaria，Cerastoderma edule和Macoma balthica）进行的比较层析分析，这些壳类来自德国湾下萨克森州瓦登海的“ Wurster Watt”，主要是垂直堆积的贝壳的大量堆积。分析了两个样带的散装样品的分类学组成，左/右阀的存在，分类单元的数量和重量百分比以及大小-频率分布。对包括磨损，破碎，结壳和生物侵蚀在内的排污特征进行了半定量分析。音谱学结果表明，双壳类和样带之间存在显着差异。大型的底栖贝类双歧杆菌，肌无力，显示出最大程度的破碎，经常被龟头和苔藓虫包裹。较小且更结实的角皮病皮肤，尤其是多毛bioPolydora ciliata对生物侵蚀具有最大价值。瓣膜最薄的Macoma balthica表现出最高的磨损值，而其余的所测得的正交性却显示出较低的值。分类单元，样本和样带之间的音位差异与（1）双壳类动物的起源（来自生活种群或裸露的殖民地层），（2）瓣膜的大小和形态不同（它们与生活方式有关）， （3）不同双壳类动物的胎盘轨迹，以及（4）两个样带的变化沉积环境。

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