Elbroch L Mark, Marescot Lucile, Quigley Howard, Craighead Derek, Wittmer Heiko U
Panthera New York New York.
School of Biological Sciences Victoria University of Wellington Wellington New Zealand.
Ecol Evol. 2018 Jun 25;8(14):7236-7245. doi: 10.1002/ece3.4264. eCollection 2018 Jul.
Humans are primary drivers of declining abundances and extirpation of large carnivores worldwide. Management interventions to restore biodiversity patterns, however, include carnivore reintroductions, despite the many unresolved ecological consequences associated with such efforts. Using multistate capture-mark-recapture models, we explored age-specific survival and cause-specific mortality rates for 134 pumas () monitored in the Greater Yellowstone Ecosystem during gray wolf () recovery. We identified two top models explaining differences in puma survivorship, and our results suggested three management interventions (unsustainable puma hunting, reduction in a primary prey, and reintroduction of a dominant competitor) have unintentionally impacted puma survival. Specifically, puma survival across age classes was lower in the 6-month hunting season than the 6-month nonhunting season; human-caused mortality rates for juveniles and adults, and predation rates on puma kittens, were higher in the hunting season. Predation on puma kittens, and starvation rates for all pumas, also increased as managers reduced elk () abundance in the system, highlighting direct and indirect effects of competition between recovering wolves and pumas over prey. Our results emphasize the importance of understanding the synergistic effects of existing management strategies and the recovery of large, dominant carnivores to effectively conserve subordinate, hunted carnivores in human-dominated landscapes.
人类是全球大型食肉动物数量减少和灭绝的主要驱动因素。然而,尽管与食肉动物重新引入相关的许多生态后果尚未得到解决,但恢复生物多样性模式的管理干预措施仍包括食肉动物的重新引入。我们使用多状态捕获-重捕模型,研究了在黄石国家公园生态系统灰狼恢复期间监测的134只美洲狮的年龄特异性存活率和死因特异性死亡率。我们确定了两个解释美洲狮存活率差异的顶级模型,我们的结果表明,三种管理干预措施(不可持续的美洲狮狩猎、主要猎物数量的减少以及优势竞争者的重新引入)无意中影响了美洲狮的生存。具体而言,在6个月的狩猎季节中,各年龄组的美洲狮存活率低于6个月的非狩猎季节;在狩猎季节,幼年和成年美洲狮的人为死亡率以及美洲狮幼崽的被捕食率更高。随着管理者减少系统中麋鹿的数量,美洲狮幼崽的被捕食率以及所有美洲狮的饥饿率也有所增加,这突出了正在恢复的狼和美洲狮在猎物竞争上的直接和间接影响。我们的结果强调了理解现有管理策略与大型优势食肉动物恢复之间的协同效应对于在人类主导的景观中有效保护从属的、被捕猎的食肉动物的重要性。