Estimating the number of species not yet described and their characteristics:: the case of Western Palaearctic dung beetle species (Coleoptera, Scarabaeoidea)
Estimating the number of species not yet described and their characteristics:: the case of Western Palaearctic dung beetle species (Coleoptera, Scarabaeoidea)
复制标题
DOI：
10.1023/a:1021247705018
复制
发表时间：
2003-01-01
影响因子：
3.4
通讯作者：
Lobo, JM
中科院分区：
文献类型：
--
作者：
Cabrero-Sañudo, FJ;Lobo, JM
为了确定西部古北区粪甲虫物种调查的完成程度，以及确定与新物种描述的可能性有关的一些主要地理和形态特征，分析了与粪便相关的三个金龟科的现有分类学和生物地理信息。已描述物种的累积数量的渐近拟合用来估计尚未描述的物种的近似数量。采用变异划分和层次分解技术探讨了个体大小、地理范围大小和地理位置变量对物种描述过程的影响。结果表明，西部古北区金龟科和地龟科的种类名录已基本完成，但仍有约16%的种类尚未记述。由于地理分布和地理位置的共同作用是该科物种描述率的主要决定因素，因此预测在西部古北区南部和东部的较小区域将发现新的屎甲种。物种的个体大小在描述年份的变化中所占的比例可以忽略不计。地理范围大小和地理位置都是与物种描述年份负相关的基本变量，它们的单一和综合效应在描述变化年份中所占比例很高(从41%到56%)。大多数分类学工作人员所在的地区，在集合中占主导地位的更广泛的通才物种，这可能是这种模式的原因。
To determine the degree of completion of Western Palaearctic dung beetle species inventory, as well as to ascertain some of the main geographical and morphological characteristics associated with the probability of new species description, the available taxonomic and biogeographic information of the three Scarabaeoidea families that are associated with dung was analyzed. An asymptotic fit of the cumulative number of described species is used to estimate the approximate number of species not yet described. Variation partitioning and hierarchical decomposition techniques were used to explore the influence of body size, geographical range size and geographical location variables on the process of species description. Results indicate that the inventories of Western Palaearctic Scarabaeidae and Geotrupidae species are almost complete, but that around 16% of Aphodiidae species have yet to be described. As the joint effect of geographical distribution and location is the main determinant of the species description rate in this family, it was predicted that new dung beetle species would be found in smaller areas of the southern and eastern Western Palaearctic region. The species body size accounted for a negligible fraction in the variation of the year of description. Both the geographical range size and the geographical location are essential variables negatively correlated with the year of species description, whose pure and combined effect can account for high percentages in the year of description variation (from 41 to 56%). The location of most of the taxonomic workforce in areas where broader-ranged generalist species prevail in the assemblages is the probable reason for this pattern.