United States Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon, United States of America.
PLoS One. 2013 May 22;8(5):e64347. doi: 10.1371/journal.pone.0064347. Print 2013.
Though a third of amphibian species worldwide are thought to be imperiled, existing assessments simply categorize extinction risk, providing little information on the rate of population losses. We conducted the first analysis of the rate of change in the probability that amphibians occupy ponds and other comparable habitat features across the United States. We found that overall occupancy by amphibians declined 3.7% annually from 2002 to 2011. Species that are Red-listed by the International Union for Conservation of Nature (IUCN) declined an average of 11.6% annually. All subsets of data examined had a declining trend including species in the IUCN Least Concern category. This analysis suggests that amphibian declines may be more widespread and severe than previously realized.
尽管全球有三分之一的两栖物种被认为受到威胁，但现有的评估方法只是简单地对灭绝风险进行分类，几乎没有提供有关种群损失速度的信息。我们首次分析了美国两栖动物占据池塘和其他类似生境特征的概率的变化速度。我们发现，2002 年至 2011 年，两栖动物的总体占有率每年下降 3.7%。被国际自然保护联盟（IUCN）列为红色名录的物种每年平均下降 11.6%。所有检查的数据子集都呈现出下降趋势，包括 IUCN 最不受关注的物种类别。这项分析表明，两栖动物的衰退可能比之前所认识到的更为广泛和严重。
