Persistence of spatial populations depends on returning home
Persistence of spatial populations depends on returning home
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DOI：
10.1073/pnas.0506651103
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发表时间：
2006-04-11
影响因子：
11.1
通讯作者：
Botsford, LW
中科院分区：
文献类型：
--
作者：
Hastings, A;Botsford, LW
有必要对通过分散阶段在空间上相连的种群的可持续性进行更好的描述和启发式理解，这既是出于管理目的，也是为了增加我们对这些种群动态的基本了解。我们证明，这样一个由相互连接的亚群组成的种群的持久性取决于多代中所有可能的封闭的斑块间繁殖路径的繁殖增益总和，相对于每条路径中自我持久性的不足，是否超过统一加上额外项，只有在有四个或更多斑块时才会出现。这些额外的术语具有启发式的解释，即它们避免了对四个或更多斑块出现的繁殖路径的重复计算，因为可能存在不重叠的子网络。因此，只有那些最终导致后代返回其起源地的繁殖和连接模式才有助于持久性。这一结果为评估连通性和栖息地异质性提供了基础，以了解保护区设计、人类破碎化的影响、海洋渔业的崩溃和其他保护问题。
There is a need for better description and heuristic understanding of the sustainability of populations connected over space by a dispersing stage, both for management purposes and to increase our basic knowledge of the dynamics of these populations. We show that persistence of such a population of connected subpopulations depends on whether the sum of the reproductive gains through all possible closed, between-patch reproductive paths through multiple generations, relative to the shortfall in self-persistence in each path, exceeds unity plus extra terms, which only appear if there are four or more patches. These extra terms have the heuristic explanation that they avoid double counting of reproductive paths that arise with four or more patches because there can be nonoverlapping subnetworks. Thus only those patterns of reproduction and connectivity which eventually lead to descendants returning to the patch from which they originate contribute to persistence. This result provides the basis for evaluating connectivity and habitat heterogeneity to understand reserve design, the effects of human fragmentation, the collapse of marine fisheries, and other conservation issues.