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首页> 外文期刊>Biology Bulletin >Spatial Heterogeneity and Biogeographical Division of the Ichthyofauna of Northern Eurasia
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Spatial Heterogeneity and Biogeographical Division of the Ichthyofauna of Northern Eurasia

机译：欧亚大陆北部鱼腥藻的空间异质性和生物地理区划

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摘要

A biogeographical division of northern Eurasia (within the USSR borders as of 1991) based on cluster analysis of the cyclostome and fish fauna composition at 597 sites listed in the Biodat database has been performed. The classification based on the Jaccard similarity coefficients included two regions, 12 subregions, eight provinces, and 11 districts. The division performed explained 67% of the variance of the similarity coefficients, this being 21% higher than the respective value for an earlier scheme (Berg, 1962) that covered a significantly greater territory. Correlation with the climatic regimes and environmental factors identified could explain 82% of fish fauna heterogeneity (the multiple coefficient of correlation was 0.91). The nonorthogonal relations with the temperature regime (67% of the variance of similarity coefficients), landscape and climatic zoning (58%), location within a specific river basin (57%), and provinciality (30%) were the most important factors.
机译：根据对Biodat数据库中列出的597个站点的气孔和鱼类动物组成的聚类分析，对欧亚大陆北部（在1991年在苏联境内）进行了生物地理划分。基于Jaccard相似系数的分类包括两个区域，12个子区域，八个省和11个地区。所执行的除法解释了相似系数方差的67％，这比覆盖更大区域的早期方案（Berg，1962年）的相应值高21％。与确定的气候条件和环境因素的相关性可以解释82％的鱼类动物异质性（相关的多重相关系数为0.91）。最重要的因素是温度条件（相似系数方差的67％），景观和气候区划（58％），特定流域内的位置（57％）和省份（30％）的非正交关系。

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