Department of Watershed Sciences and the Ecology Center, Utah State University, Logan, UT 84322-5210, USA.
Center for Fisheries, Aquaculture and Aquatic Sciences, Department of Zoology, Southern Illinois University, Carbondale, IL 62901-6511, USA.
Sci Adv. 2020 Aug 5;6(32):eabb8458. doi: 10.1126/sciadv.abb8458. eCollection 2020 Aug.
As a result of their extensive home ranges and slow population growth rates, predators have often been perceived to suffer higher risks of extinction than other trophic groups. Our study challenges this extinction-risk paradigm by quantitatively comparing patterns of extinction risk across different trophic groups of mammals, birds, and reptiles. We found that trophic level and body size were significant factors that influenced extinction risk in all taxa. At multiple spatial and temporal scales, herbivores, especially herbivorous reptiles and large-bodied herbivores, consistently have the highest proportions of threatened species. This observed elevated extinction risk for herbivores is ecologically consequential, given the important roles that herbivores are known to play in controlling ecosystem function.
由于它们广泛的家庭范围和缓慢的人口增长率，捕食者往往被认为比其他营养群体面临更高的灭绝风险。我们的研究通过定量比较哺乳动物、鸟类和爬行动物不同营养群体的灭绝风险模式，挑战了这一灭绝风险范式。我们发现，营养水平和体型是所有分类群中影响灭绝风险的重要因素。在多个时空尺度上，食草动物，尤其是食草性爬行动物和大体型食草动物，始终拥有最高比例的受威胁物种。鉴于食草动物在控制生态系统功能方面所扮演的重要角色，这种对食草动物灭绝风险的观察结果在生态上是有意义的。
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