North American terrestrial gastropods through each end of a spyglass
North American terrestrial gastropods through each end of a spyglass
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北美陆生腹足动物通过望远镜的每一端
DOI：
10.1093/mollus/eyu028
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发表时间：
2014
影响因子：
1.2
通讯作者：
J. Nekola
中科院分区：
文献类型：
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作者：
J. Nekola
一些人认为，由于规模独立，主要的生物多样性指标可以通过对精心挑选的一组单独地点的分析来大规模估计。其他人试图通过对大陆池的分析来估计各个地点的模式。但这种跨尺度外推有效吗？通过比较不同地点和大陆尺度的科代表性、物种丰富度和体型模式，解决了北美陆生腹足动物群的这个问题。这些数据显示出深刻的差异：虽然大陆动物群以体型较大的科为主，如 Polygyridae、Helminthoglyptidae、Oreohelicidae、Succineidae 和 Urocoptidae，但平均地点动物群最常见的是体型较小的科，如 Vertiginidae、Gastrodontidae、Oxychilidae、Euconulidae、Punctidae、Valloniidae、球藻科和球藻科。遗址内的物种丰富度往往比从区域或大陆池中随机抽取相同数量个体的物种丰富度小 2-7 倍，这表明遗址动物区系的构建可能存在强烈偏差。而且，虽然平均地点动物群的体型范围严重右偏，但大陆池却严重左偏。因此，尽管生物体积为 0.16 mm 3 的类群在大陆动物群中占主导地位（占总数的 79.4%），但它们仅占个别地点物种列表的一小部分平均比例（4.1%）。在大多数区域内，与区域池相比，生物体积为 4m m 3 的物种中现场动物群的代表性过高，而生物体积为 0.128 mm 3 的物种中的代表性不足。因此，陆生腹足动物观测尺度之间的自相似性假设是不合适的。
Some suggest that because of scale independence major biodiversity metrics can be estimated at large scales from analysis of a well chosen suite of individual sites. Others have attempted to estimate individual site patterns from analysis of the continental pool. But does such cross-scale extrapolation work? This issue is addressed for the North American terrestrial gastropod fauna by comparison of family representation, species richness and body-size patterns across site to continental scales. These data demonstrate profound differences: while the continental fauna is dominated by large body-size families such as the Polygyridae, Helminthoglyptidae, Oreohelicidae, Succineidae and Urocoptidae, average site faunas are most frequently represented by small body-sized families like the Vertiginidae, Gastrodontidae, Oxychilidae, Euconulidae, Punctidae, Valloniidae, Strobilopsidae and Ellobiidae. Species richness within sites tends to be 2–7 times smaller than random draws of individuals of the same number from regional or continental pools, indicating the potential for strong bias in the construction of site faunas. And, while the body-size spectrum for average site faunas is strongly right-skewed, the continental pool is strongly left-skewed. Thus, although taxa with biovolumes .16 mm 3 dominate the continental fauna (79.4% of total), they make up only a small average fraction (4.1%) of individual site species lists. Within most regions, site faunas are overrepresented in species with biovolumes , 4m m 3 and underrepresented in species with biovolumes .128 mm 3 as compared with the regional pool. As a result, assumptions of self-similarity between observational scales in terrestrial gastropods are inappropriate.