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Correlations among extinction risks assessed by different systems of threatened species categorization

机译:通过不同的受威胁物种分类系统评估的灭绝风险之间的相关性

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摘要

Many different systems are used to assess levels of threat faced by species. Prominent ones are those used by the World Conservation Union, NatureServe, and the Florida Game and Freshwater Fish Commission (now the Florida Fish and Wildlife Conservation Commission). These systems assign taxa a threat ranking by assessing, their demographic and ecological characteristics. These threat rankings support the legislative protection of species and guide the placement of conservation programs in order of priority. It is not known, however whether these assessment systems rank species in a similar order To resolve this issue, we assessed 55 mainly vertebrate taxa with widely differing life histories under each of these systems and determined the rank correlations among them. Moderate, significant positive correlations were seen among the threat rankings provided by the three systems (correlations 0.58-0.69). Further the threat rankings for taxa obtained using these systems were significantly correlated to their rankings based on predicted probability of extinction within 100 years as determined by population viability analysis (correlations 0.28-0.37). The different categorization systems, then, yield related but not identical threat rankings, and these rankings are associated with predicted extinction risk.
机译:许多不同的系统用于评估物种面临的威胁程度。突出的是世界自然保护联盟,NatureServe以及佛罗里达野生动物和淡水鱼类委员会(现为佛罗里达鱼类和野生动物保护委员会)所使用的那些。这些系统通过评估其人口统计和生态特征,为分类单元分配威胁等级。这些威胁等级支持对物种的立法保护,并按照优先顺序指导保护方案的放置。但是,尚不知道这些评估系统是否以相似的顺序对物种进行排名。为解决此问题,我们评估了55个主要脊椎动物种群,它们在每个系统下的生活历史都有很大不同,并确定了它们之间的等级相关性。在这三个系统提供的威胁等级之间,存在中等程度的显着正相关(相关系数0.58-0.69)。此外,使用这些系统获得的分类单元的威胁等级与根据人口生存力分析确定的100年内预计灭绝概率的等级显着相关(相关系数0.28-0.37)。然后,不同的分类系统会产生相关但不相同的威胁等级,并且这些等级与预计的灭绝风险相关。

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