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Spatiotemporal effects of Hurricane Ivan on an endemic epiphytic orchid: 10 years of follow-up
Plant Ecology & Diversity ( IF 1.7 ) Pub Date : 2019-10-17 , DOI: 10.1080/17550874.2019.1673495
Iván A. Ortiz-Rodríguez 1, 2 , Jose Raventós 3 , Ernesto Mújica 4 , Elaine González-Hernández 5 , Ernesto Vega-Peña 2 , Pilar Ortega-Larrocea 6 , Andreu Bonet 3 , Cory Merow 7
Affiliation  

ABSTRACT Background: Hurricanes have a strong influence on the ecological dynamics and structure of tropical forests. Orchid populations are especially vulnerable to these perturbations due to their canopy exposure and lack of underground storage organs and seed banks. Aims: We evaluated the effects of Hurricane Ivan on the population of the endemic epiphytic orchid Encyclia bocourtii to propose a management strategy. Methods: Using a pre- and post-hurricane dataset (2003–2013), we assessed the population asymptotic and transient dynamics. We also identified the individual size-stages that maximise population inertia and E. bocourtii’s spatial arrangement relative to phorophytes and other epiphytes. Results: Hurricane Ivan severely affected the survival and growth of individuals of E. bocourtii, and caused an immediate decline of the population growth rate from λ = 1.05 to λ = 0.32, which was buffered by a population reactivity of ρ1 = 1.42. Our stochastic model predicted an annual population decrease of 14%. We found an aggregated spatial pattern between E. bocourtii and its host trees, and a random pattern relative to other epiphytes. Conclusion: Our findings suggest that E. bocourtii is not safe from local extinction. We propose the propagation and reintroduction of reproductive specimens, the relocation of surviving individuals, and the establishment of new plantations of phorophytes.

中文翻译:

飓风伊万对地方性附生兰花的时空影响:10 年的随访

摘要 背景:飓风对热带森林的生态动态和结构有很强的影响。兰花种群特别容易受到这些扰动的影响,因为它们的树冠暴露在外,并且缺乏地下储藏器官和种子库。目的:我们评估了飓风伊万对地方性附生兰花 Encyclia bocourtii 种群的影响,以提出管理策略。方法:使用飓风前和飓风后数据集(2003-2013),我们评估了人口渐近和瞬态动态。我们还确定了最大化种群惯性和 E. bocourtii 相对于叶藻和其他附生植物的空间排列的个体大小阶段。结果:飓风伊万严重影响了 E. bocourtii 个体的生存和生长,并导致人口增长率从 λ = 1.05 立即下降到 λ = 0.32,这被 ρ1 = 1.42 的人口反应性所缓冲。我们的随机模型预测每年人口减少 14%。我们发现 E. bocourtii 与其寄主树之间存在聚合空间模式,以及相对于其他附生植物的随机模式。结论:我们的研究结果表明 E. bocourtii 不会在当地灭绝。我们建议繁殖和重新引入繁殖标本,重新安置幸存个体,以及建立新的叶藻种植园。以及相对于其他附生植物的随机模式。结论:我们的研究结果表明 E. bocourtii 不会在当地灭绝。我们建议繁殖和重新引入繁殖标本,重新安置幸存个体,以及建立新的叶藻种植园。以及相对于其他附生植物的随机模式。结论:我们的研究结果表明 E. bocourtii 不会在当地灭绝。我们建议繁殖和重新引入繁殖标本,重新安置幸存个体,以及建立新的叶藻种植园。
更新日期:2019-10-17
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