Quantifying the effects of multiple processes on local abundance: a cohort approach for open populations.
Quantifying the effects of multiple processes on local abundance: a cohort approach for open populations.
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量化多个过程对当地丰度的影响：开放种群的队列方法。
作者：
R. Schmitt;S. Holbrook;C. Osenberg
对于人口统计学上开放种群的物种来说，一个挑战是评估共同决定当地丰度的各种过程的相对重要性。我们开发了一个基于队列的框架，用于量化外来殖民者供应和随后的密度无关和密度相关死亡率对当地丰度的影响。两种互补的方法——基于限制和弹性——揭示了这些过程之间相互作用和非线性的本质。研究人员使用了一种印度太平洋珊瑚鱼的数据来记录定居者与幸存者的关系，并量化了定居点的自然变化。密度依赖的限制分别比供应或密度无关的死亡率高2倍和20倍。弹性分析表明，与密度依赖性相比，成虫丰度对供应的小比例变化的敏感性高40%。这些技术提供了一种跨系统比较的方法，可以增强我们对形成开放种群的当地物种丰度的过程得出一般性结论的能力。
A challenge for species with demographically open populations is to evaluate the relative importance of various processes that together set local abundance. We developed a cohort-based framework for quantifying the influence of an external supply of colonists and subsequent density-independent and density-dependent mortality on local abundance. Two complementary approaches - based on limitation and elasticity - revealed the nature of interactions and nonlinearities among these processes. Data for an Indo-Pacific reef fish were used to document the settler-survivor relationship and to quantify natural variation in settlement. Limitation by density-dependence was two-fold and 20-fold greater than by supply or density-independent mortality, respectively. Elasticity analyses showed that adult abundance was 40% more sensitive to small proportionate changes in supply than in density-dependence. These techniques provide a way to compare across systems, which could enhance our ability to draw general conclusions regarding the processes that shape local abundance of species with open populations.