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首页> 外文期刊>Population Ecology >Variation in the demographics of a rare central Oregon endemic, Astragalus peckii Piper (Fabaceae), with fluctuating levels of herbivory
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Variation in the demographics of a rare central Oregon endemic, Astragalus peckii Piper (Fabaceae), with fluctuating levels of herbivory

机译：稀有的俄勒冈州中部特有种，黄芪啄木鸟（豆科）的人口统计学变化，草食动物水平波动

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摘要

Understanding variation in plant vital rates (survival, growth, and reproduction) and population demographic parameters for rare plant taxa facilitates effective management for long-term persistence. We evaluated demographics of the rare plant Astragalus peckii (Fabaceae), a state-listed Threatened plant in Oregon, USA, with particular emphasis on how a microlepidopteran herbivore, Sparganothis tunicana, impacted vital rates and population growth. Stage-based transition matrix models were used to compute population growth rate (λ) and elasticity from 2006 to 2009 at two populations: Bull Flat, which was located in the main population center; and Chiloquin, a naturally isolated population. Population growth at Bull Flat was stable to slightly declining (λ = 0.96, 95 % CI 0.91–1.00) whereas at Chiloquin, the isolated population, population growth was increasing (λ = 1.20, 95 % CI 1.15–1.24). Microlepidopteran herbivory was associated with different plant responses in each population. At Bull Flat, plant survival was lower with greater herbivore presence. At Chiloquin, reproduction was reduced in plants when herbivores were active earlier in the growing season. Despite these effects on plant vital rates, we found lower population growth only during one transition period at Bull Flat when we compared matrices with and without herbivory. In addition to herbivory, we also address the potential role precipitation plays as a contributor to site differences and temporal variation within sites. Overall, we illustrate how two populations can have different responses to the same disturbance factor and highlight implications for management of different populations across the landscape.
机译：了解稀有植物类群的植物生命率（存活，生长和繁殖）和种群人口参数的变化，有助于长期持久性的有效管理。我们评估了稀有植物黄芪（Fabaceae）的人口统计资料，该植物是美国俄勒冈州受威胁的国家列出的受威胁植物，并特别强调了微鳞翅目草食动物Sparganothis tunicana如何影响生命率和种群增长。使用基于阶段的过渡矩阵模型来计算两个人口在2006年至2009年之间的人口增长率（λ）和弹性。和自然隔绝的人口Chiloquin。 Bull Flat的人口增长稳定至略有下降（λ= 0.96，95％CI 0.91–1.00），而在Chiloquin，孤立的人口，人口增长正在增加（λ= 1.20，95％CI 1.15-1.24）。微鳞翅目草食性与每个种群中不同的植物反应有关。在Bull Flat，草食动物的存在使植物的存活率降低。在Chiloquin，当草食动物在生长期较早时活跃时，植物的繁殖减少。尽管这些因素对植物的生命率有影响，但是当我们比较有草食性和无草食性的矩阵时，我们发现仅在公牛平原的一个过渡期内种群增长较低。除草食动物外，我们还探讨了降水在位点差异和位点时间变化中的潜在作用。总体而言，我们说明了两个种群如何对相同的干扰因子做出不同的响应，并着重说明了对整个景观中不同种群的管理的意义。

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