Dispersal, Population Growth, and the Allee Effect: Dynamics of the House Finch Invasion of Eastern North America
Dispersal, Population Growth, and the Allee Effect: Dynamics of the House Finch Invasion of Eastern North America
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DOI：
10.1086/285924
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发表时间：
1996-08
期刊：
影响因子：
--
通讯作者：
R. Veit;M. Lewis
中科院分区：
文献类型：
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作者：
R. Veit;M. Lewis
自1940年左右，当它们第一次在纽约市地区被释放时，家雀（Carpodacus mexicanus）爆炸性地繁殖，并在北美东部大部分地区定居。我们利用丰富详细的文件，这种生物入侵，构建一个数学模型，预测人口扩散率的基础上容易测量的人口参数。我们试图通过预测在最初的缓慢增长期之后加速的传播速度来改进以前的模型，这是家雀以及其他各种入侵物种的传播模式。我们假设，一个Allee效应不成比例地降低生殖力低于一个临界阈值密度的丰度是机制，导致在入侵的早期阶段的传播速度较慢。我们的积分差分方程模型还强调了长距离扩散和人口扩散率之间的联系。
Since about 1940, when they were first released in the New York City area, house finches (Carpodacus mexicanus) have multiplied explosively and colonized much of eastern North America. We take advantage of the richly detailed documentation of this biological invasion to construct a mathematical model that predicts the rate of population spread on the basis of readily measurable demographic parameters. We seek to improve on previous models by predicting a rate of spread that accelerates following an initial period of slower growth, a pattern of spread followed by house finches as well as a variety of other invading species. We postulate that an Allee effect-disproportionately lowered fecundity below a critical threshold density of abundance-is the mechanism leading to a slower rate of spread in the early stages of the invasion. Our integrodifference equation model also emphasizes the link between long-distance dispersal and the rate of population spread.