Comparative Population Biology of Critically Endangered Dracocephalum austriacum (Lamiaceae) in Two Distant Regions
Comparative Population Biology of Critically Endangered Dracocephalum austriacum (Lamiaceae) in Two Distant Regions
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DOI：
10.1007/s12224-012-9132-2
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发表时间：
2013-03-01
影响因子：
1.2
通讯作者：
Muenzbergova, Zuzana
中科院分区：
文献类型：
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作者：
Dostalek, Tomas;Muenzbergova, Zuzana
我们的研究旨在比较两个遥远地区（捷克和斯洛伐克喀斯特）具有相似栖息地条件的极度濒危物种奥地利青兰的种群动态，并评估有关影响一个地区种群表现的因素的结论是否有助于了解另一地区的物种动态。使用转移矩阵模型来检查该物种的种群动态。结果显示，斯洛伐克喀斯特地区的种群表现优于捷克喀斯特地区的种群。对种群增长率贡献最大的转变是小型和大型成年植物阶段的停滞。然而，这些转变在人群和年份之间是稳定的，这表明它们对正在进行的变化不是很敏感。对种群增长率变化影响最大的转变包括大型成年植物的种子和幼苗生产、小型成年植物的种子萌发和停滞和生长。这些转变似乎受到栖息地条件（土壤深度和裸露岩石覆盖）、种群遗传参数、气候波动（尤其是严重干旱）和灌木扩张的影响。除了幼苗生长和大型成虫停滞的贡献外，对人口增长率贡献最大的转变在各地区之间非常相似。在使用有关其他地区最重要的生命周期转变的信息之前，需要考虑这些差异。我们认为，即使在非常遥远的地区，栖息地要求狭窄的其他物种也会发现类似的结果，这些物种占据非常相似的栖息地。
Our study aims to compare the population dynamics of critically endangered species, Dracocephalum austriacum, in two distant regions (Czech and Slovak Karst) with similar habitat conditions, and to evaluate if conclusions concerning factors affecting population performance in one region could help in understanding species dynamics in the other region. Transition matrix models were used to examine population dynamics of the species. Results show that populations in the Slovak Karst are performing better than populations in the Czech Karst. The transitions contributing most to the population growth rates were those of stasis in the small and large adult plant stage. These transitions are, however, stable between populations and years, suggesting that they are not very sensitive to the ongoing changes. Transitions that contribute most to variations in population growth rate include seed and seedling production by large adult plants, seed germination and stasis and growth of small adult plants. These transitions seem to be affected by habitat conditions (soil depth and bare rock cover), genetic parameters of the populations, climate fluctuations (especially severe droughts), and shrub expansion. The transitions contributing most to the population growth rates are very similar between the regions except for contributions of seedling growth and stasis of large adults. These differences need to be considered before using information about the most important life cycle transitions in other regions. We suggest that similar results would be found for other species with narrow habitat requirements occupying very similar habitats, even in very distant regions.