Overview of the North American Terrestrial Gastropod Fauna*
Overview of the North American Terrestrial Gastropod Fauna*
复制标题
北美陆生腹足动物群概述*
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Nekola
中科院分区：
文献类型：
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作者：
J. Nekola
摘要：
2012年春汇编了修订的墨西哥北部北美陆生腹足类数据库，其中不仅包括所有可能的物种一级实体、最新的科和归化的外来任务，而且还包括贝壳和身体大小数据。分析表明：(1)该区系约有1,200种，以多刺科、蠕虫科和眩科为主。这一数字令人惊讶地很小，其他陆地块大小的1/2到1/100拥有更大的动物群；(2)归化物种占动物总数的6%；(3)虽然鼻涕虫只占本土动物群的7%，但它们占归化动物群的1/3以上；(4)公认物种的累积曲线是S形的，目前的比率是200年来最低的。因此，似乎只有150-300个新的分类群有待描述，未来的分类工作主要是修订工作；(5)与其他动物群一样，北美原生和归化的陆螺都具有双峰高宽比；(6)原生陆螺具有沿对数轴的双峰右偏生物体积分布，这与许多其他类群的典型单峰左偏分布有很大不同；(7)物种在科和属内的分布以及给定研究人员所描述的物种数量都具有复杂适应系统的幂定律/对数正态分布特征。
Abstract:
A revised database of terrestrial gastropods from North America north of Mexico was assembled in the spring of 2012, which included not only all likely species-level entities, updated family and naturalized exotic assignments, but also shell and body size data. Analyses of these reveal that: (1) the fauna represents approximately 1,200 species, and is dominated by the Polygyridae, Helminthoglyptidae, and Vertiginidae. This number is surprisingly small, with other land masses of ½ to 1/100th the size possessing a larger fauna; (2) naturalized species make up 6% of the total fauna; (3) while slugs represent only 7% of the native fauna, they constitute over 1/3 of the naturalized fauna; (4) the accumulation curve for recognized species is sigmoidal, with current rates being the lowest experienced in 200 years. As a result, it appears that only 150–300 net additional taxa may await description, with the principle future taxonomic activity being revisionary work; (5) like other faunas, both native and naturalized land snails in North America possess bimodal height/width ratios; (6) native land snails possess a bimodal, right-skewed biovolume distribution along a log axis, which differs greatly from the unimodal left-skewed distribution typical of many other taxa groups; and, (7) the distribution of species within families and genera, and of the number of species described by a given researcher all possess Power Law/Log Normal distributions characteristic of complex adaptive systems.