Long-term decline in white-tailed deer browse supply: can lichens and litterfall act as alternative food sources that preclude density-dependent feedbacks
Long-term decline in white-tailed deer browse supply: can lichens and litterfall act as alternative food sources that preclude density-dependent feedbacks
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白尾鹿觅食供应的长期下降：地衣和凋落物能否作为替代食物来源，排除依赖于密度的反馈
DOI：
10.1139/z05-090
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发表时间：
2005
影响因子：
1.4
通讯作者：
S. Côté
中科院分区：
文献类型：
--
作者：
J. Tremblay;I. Thibault;C. Dussault;J. Huot;S. Côté
鹿科动物的择食对森林生态系统有着持久的影响。在加拿大魁北克的安蒂科斯蒂岛，引进的白尾鹿（Odocoileus virginianus（Zimmermann，1780））对当地的北方森林造成了巨大的变化。尽管近几十年来鹿的种群数量明显稳定，但我们怀疑它们与它们的食物供应并不平衡，栖息地已经进一步退化。两个浏览调查进行了25年的比较显示，浏览可用性大幅下降。虽然香脂冷杉（Abies balsamea（L.）P. Mill.）在大多数林分（n = 13）中，其数量下降或消失。 25年前仍然存在的首选落叶树种几乎消失了。食物供应的持续下降证实了我们的假设。这种情况可能会因冬季凋落物的补贴而加剧，这是一种重要而稳定的替代食物来源。The abundance of litterfall f.
Selective browsing by cervids has persistent impacts on forest ecosystems. On Anticosti Island, Quebec, Canada, introduced white-tailed deer (Odocoileus virginianus (Zimmermann, 1780)) have caused massive changes to the native boreal forest. Despite the apparent stability of the deer population over recent decades, we suspected that they were not at equilibrium with their browse supply and that further degradation of the habitat had occurred. A comparison of two browse surveys conducted 25 years apart showed a strong decline in browse availability. Although balsam fir (Abies balsamea (L.) P. Mill.) remained the most available browse species, it declined or disappeared from most stands (n = 13). Preferred deciduous species that were still available 25 years ago have almost disappeared. The continuous decline of the browse supply confirmed our hypothesis. This situation may be exacerbated by a subsidy from the winter litterfall, a significant and stable alternative food source. The abundance of litterfall f...