Demographic Theory for an Open Marine Population with Space-Limited Recruitment
Demographic Theory for an Open Marine Population with Space-Limited Recruitment
复制标题
有限空间招募的开放海洋人口的人口统计理论
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
C. Baxter
中科院分区：
文献类型：
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作者：
J. Roughgarden;Y. Iwasa;C. Baxter
我们介绍了一个人口模型的本地人口的固着海洋无脊椎动物，有一个远洋幼虫阶段。模型中的过程是幼虫在空的空间上的沉降，以及沉降的生物体的生长和死亡。每单位未占用空间的沉降率假定由当地系统之外的因素决定。该模型通过时间预测局部系统中每个年龄的动物数量。该模型提供离散和连续时间版本。主要结果是，定居生物的生长是不稳定的。在这个模型中，总有一个状态，在这个状态下，招募平衡死亡率。然而，增长可能干扰征聘，并可能破坏这一稳定状态，只要定居率足够高。该模型表明，根据定居率的不同，人口结构会产生两种性质不同的情况。在高定居点限制下，潮间景观是一幅马赛克般的队列，偶尔会出现空置基底的间隙。在低沉降极限，潮间带景观有空置的空间和所有年龄的生物混合在一起，空间变化的丰度是由微地理变化的定居点和死亡率。
We introduce a demographic model for a local population of sessile marine invertebrates that have a pelagic larval phase. The processes in the model are the settling of larvae onto empty space, and the growth and mortality of the settled organisms. The rate of settlement per unit of unoccupied space is assumed to be determined by factors outside of the local system. The model predicts the number of animals of each age in the local system through time. The model is offered in both discrete and continuous—time versions. The principal result is that the growth of the settled organisms is destabilizing. In the model, there is always a state where recruitment balances mortality. However, growth can interfere with recruitment and can destabilize this steady state, provided also that the settlement rate is sufficiently high. The model suggests that two qualitatively distinct pictures of population structure result, depending on the settlement rate. In the high settlement limit, the intertidal landscape is a mosaic of cohorts, punctuated with occasional gaps of vacant substrate. In the low settlement limit, the intertidal landscape has vacant space and organisms of all ages mixed together and spatial variation in abundance is caused by microgeographic variation in settlement and mortality rates.