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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >High dead-live mismatch in richness of molluscan assemblages from carbonate tidal flats in the Persian (Arabian) Gulf
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High dead-live mismatch in richness of molluscan assemblages from carbonate tidal flats in the Persian (Arabian) Gulf

机译：波斯（阿拉伯）海湾碳酸盐岩滩涂软体动物组合的丰富度中存在很高的死活失配

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摘要

Live-dead (LD) fidelity studies are a fundamental tool for assessing the quality of the paleobiological information preserved in the fossil record. An important feature of death assemblages (DAs) is that they are time-averaged to some degree. Previous studies found that subtidal carbonate environments are characterized by lower time averaging in comparison to siliciclastic settings, primarily because of a high rate of shell loss due to bioerosion and dissolution. These factors lead to increased temporal resolution in subtidal carbonate death assemblages (DAs) but more intense bias in species composition due to differential loss of vulnerable shells. A consequence of lower time-averaging is a better match in live-dead (LD) richness. We evaluated LD fidelity of molluscan assemblages from soft sediments in subtropical, carbonate tidal flats along the coast of the United Arab Emirates (Persian (Arabian) Gulf) to test these predictions. A total of 7193 mollusks from six sites were analyzed. We found that DAs are, on average, over five times richer than living assemblages (LAs) at site scale, and nearly five times at habitat scale. We found that early cementation, lateral mixing, intense bioturbation and moderate sedimentation rates can account for large LD differences in richness. Differential intensity in lateral mixing by post-mortem transport inflated alpha, beta, and gamma diversity by 28, 10 and 42%. However, beta diversity is strongly underestimated in DAs when compared to LAs. Evenness was larger in DAs both at site and at habitat scales, but there was only a high mismatch at sites with patchy LAs. Fidelity of feeding guild structure was high for rank abundance, with secondary consumers well represented in DAs. The occurrence of out-of-habitat taxa did not affect fidelity in rank-abundance of feeding guild structure. Our results suggest that time averaging in carbonate tidal flats can potentially be higher compared with subtidal carbonate environments. (C) 2016 Elsevier B.V. All rights reserved.
机译：活死（LD）保真度研究是评估化石记录中保存的古生物学信息质量的基本工具。死亡集合（DA）的一个重要特征是它们在一定程度上具有时间平均性。先前的研究发现，潮下碳酸盐岩环境的特征是与硅质碎屑环境相比，平均时间较短，这主要是由于生物侵蚀和溶解造成的高壳层损失率。这些因素导致潮下带碳酸盐死亡组合（DAs）的时间分辨率提高，但由于易损贝壳的差异损失，物种组成上的偏见更加强烈。降低平均时间的结果是更好地匹配了活死（LD）丰富度。我们评估了阿拉伯联合酋长国（波斯（阿拉伯）海湾）沿海亚热带碳酸盐岩滩涂中软体沉积物的软体动物集合体的LD保真度，以检验这些预测。分析了来自六个地点的总共7193个软体动物。我们发现，在站点规模上，DA的平均丰富度是生活组合（LA）的五倍多，而在栖息地规模上的DA则高出近五倍。我们发现，早期的胶结作用，横向混合，强烈的生物扰动和适度的沉积速率可以解释富矿中LD的巨大差异。事后运输的横向混合中的差异强度使α，β和γ多样性增加了28％，10％和42％。但是，与LA相比，DA中的β多样性被低估了。无论是在地点还是在生境范围内，DA的均一性都更大，但在LA斑片状的地点，只有高度不匹配。喂养公会结构的忠诚度很高，等级丰富，次要消费者在DA中有很好的代表。居住区外分类单元的出现并没有影响到行会结构的等级保真度。我们的结果表明，与潮下碳酸盐环境相比，碳酸盐滩涂中的平均时间可能更高。 （C）2016 Elsevier B.V.保留所有权利。

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