ECOLOGICAL INFLUENCES ON THE DYNAMICS OF A FIELD VOLE METAPOPULATION
ECOLOGICAL INFLUENCES ON THE DYNAMICS OF A FIELD VOLE METAPOPULATION
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田鼠复合种群动态的生态影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Jouko Pokki
中科院分区：
文献类型：
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作者：
E. Crone;D. Doak;Jouko Pokki
虽然集合种群理论在基础生态学和应用生态学中得到了广泛的应用，但仍然很少有实证研究探讨自然种群的扩散、斑块大小和持久性之间的关系。在这里，我们重新分析了数据，从一个为期六年的研究空间结构的田鼠（田鼠agrestis）集合种群在Tvar- Minne群岛，芬兰。我们的目标是解决与集合种群研究有关的几个问题：（1）亚种群内动态、扩散行为、栖息地质量和集合种群动态之间的关系：（2）集合种群理论中最常见的结论之一的普遍性--较小的、不经常有人居住的岛屿对集合种群动态不太重要;以及（3）理解和预测“类集合种群”系统动态的不同方法的比较。我们的研究结果表明，这个田鼠集合种群是由岛屿亚群的定居和殖民。然而，与预期相反的是，来自微小的、短暂的斯凯里亚群的田鼠殖民对于后种群持续性的重要性，与来自大岛屿上更持久的亚群的殖民一样。这种模式导致较小的岛屿上不太稳定的田鼠密度，加上增加移民之前的亚群precentitions。无论是空间隐式Levins模型或发病率函数模型提供了合理的预测的结构和功能，这个集合种群，但参数拟合发病率函数年之间变化很大。我们的研究结果表明，模型的真实的集合种群不需要成为高度的细节导向或空间复杂，以提供良好的预测能力。然而，集合种群理论的应用需要仔细考虑如何不成熟的生态和行为机制将塑造特定物种和情况的集合种群动态。
Although metapopulation theory is widely used in basic and applied ecology, there are still few empirical studies that explore the relationships between dispersal, patch size, and the persistence of natural populations. Here, we reanalyzed data from a six-year study of a spatially structured field vole (Microtus agrestis) metapopulation in the Tvar- minne archipelago, Finland. Our goal was to address several issues relevant to metapo- pulation studies: (1) the relationships between within-subpopulation dynamics, dispersal behavior, habitat quality, and metapopulation dynamics; (2) the generality of one of the most common conclusions of metapopulation theory—that smaller and less frequently in- habited islands are less important for metapopulation dynamics; and (3) the comparison of different methods for understanding and predicting dynamics in 'metapopulation-like' systems. Our results suggest that this vole metapopulation is driven by extinctions and colonizations of island subpopulations. However, contrary to expectation, colonizations by voles from tiny, ephemeral skerry subpopulations were about as important for metapopu- lation persistence as were colonizations from the more persistent subpopulations on large islands. This pattern resulted from less stable vole densities on smaller islands, combined with increased emigration preceding subpopulation extinctions. Either spatially implicit Levins models or incidence function models provided reasonable predictions of the structure and function of this metapopulation, but parameters fitted to incidence functions varied dramatically among years. Our results suggest that models of real metapopulations need not become highly detail oriented or spatially complicated to provide good predictive power. However, applications of metapopulation theory require careful consideration of how un- derlying ecological and behavioral mechanisms will shape metapopulation dynamics of particular species and situations.