Influence of setting, sieve size, and sediment depth on multivariate and univariate assemblage attributes of coral reef-associated mollusc death assemblages from the Gulf of Aqaba
Influence of setting, sieve size, and sediment depth on multivariate and univariate assemblage attributes of coral reef-associated mollusc death assemblages from the Gulf of Aqaba
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设置、筛子尺寸和沉积物深度对亚喀巴湾珊瑚礁相关软体动物死亡组合的多变量和单变量组合属性的影响
DOI：
10.1007/s10347-018-0530-7
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发表时间：
2018
期刊：
影响因子：
1.8
通讯作者：
Zuschin
中科院分区：
文献类型：
--
作者：
Hausmann;Domanski;Zuschin
海洋无脊椎动物群落的多样性和生态措施取决于各种因素，包括环境条件和方法的决定。在这项研究中，这些因素对多变量和单变量组合参数的软体动物死亡组合从亚喀巴（红海，约旦）的影响进行了评估。沉积物样品收集在两个珊瑚礁类型，在13米的水深，其特点是细粒沉积物和aMillepora边缘礁与粗粒沉积物在5米的水深的补丁礁。将沉积柱的上部和下部10 cm分别取出，并用1 mm和2 mm的筛目尺寸筛分。一个大型的数据集6400双壳类和腹足类贝壳的汇编，以评估如何设置，沉积物深度和筛的大小影响分类组成和物种丰富度，物种丰度模式和香农-维纳指数，每种钻壳的数量和钻井频率（DF）的组合。设置有最强的影响，在所有方面，其次是筛的大小，但沉积物的深度是微不足道的，可能是由于完全同质化的沉积物的改造和生物扰动。多变量组合参数区分类别（设置，筛的大小）比单变量的措施。筛大小相关的分歧之间的两个更高的类群主要是由于潜在的差异，在身体大小分布的双壳类和腹足类组合。我们的结论是，珊瑚礁相关沉积物中软体动物死亡组合的物种丰富度和其他生态特征将最强烈地反映所选地点的栖息地复杂性，受到方法决策的显著影响（即，筛的大小），只能很好地保存时间模式，结果将在双壳类和腹足类之间有所不同。
Measures of diversity and ecology of marine invertebrate assemblages depend on a variety of factors including environmental conditions and methodological decisions. In this study, the influence of such factors on multi- and univariate assemblage parameters of molluscan death assemblages from the Gulf of Aqaba (Red Sea, Jordan) was evaluated. Sediment samples were collected at two coral reef types, a patch reef at 13 m of water depth characterized by fine-grained sediments and aMillepora-fringing reef with coarse-grained sediments at 5 m of water depth. The upper and lower 10 cm of the sediment column were separately removed and sieved with mesh sizes of 1 and 2 mm. A large dataset of 6400 bivalve and gastropod shells was compiled to evaluate how setting, sediment depth, and sieve size influenced taxonomic composition and species richness, species-abundance patterns and the Shannon–Wiener index, the number of drilled shells per species and drilling frequency (DF) of the assemblage. Setting had the strongest impact on all aspects, followed by sieve size, but sediment depth was insignificant, probably due to complete homogenization of the sediments by reworking and bioturbation. Multivariate assemblage parameters distinguished much better between categories (setting, sieve size) than univariate measures. Sieve size-related disagreements recognized between the two higher taxa are mostly due to the underlying difference in body-size distribution of bivalve and gastropod assemblages. We conclude that species richness and other ecological characteristics of molluscan death assemblages in coral reef-associated sediments will most strongly reflect habitat complexity of the sites chosen, are significantly influenced by methodological decisions (i.e., sieve size), will only poorly preserve temporal patterns, and the results will differ between bivalves and gastropods.
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