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From nest site lottery to host lottery: continuous model of growth suppression driven by the availability of nest sites for newborns or hosts for parasites and its impact on the selection of life history strategies
Theory in Biosciences ( IF 1.1 ) Pub Date : 2020-01-04 , DOI: 10.1007/s12064-019-00307-0
Krzysztof Argasinski 1 , Ryszard Rudnicki 2
Affiliation  

The idea that selection works in different ways during free population growth and at the equilibrium population size has been present in theoretical biology for a long time. It was first expressed as an r and K selection concept and later clarified in the debate on fitness measures in life history theory. The latest discussion related to this topic is focused on the nest site lottery mechanism and the resulting new population growth model. In this mechanistic biphasic model, the suppression of growth is induced by a shortage of free nest sites for newborns. Before it occurs, the population can grow exponentially. In this paper, the continuous version of the model and its selective properties are analysed. We show a continuous smooth transition between different fitness measures operating during the exponential growth and suppressed growth phase and at the equilibrium population size. Then, the model is extended to the case of a population of parasites, where a constant number of nest sites is replaced by the dynamics of a population of their hosts, in the role of the limiting supply. Parasite strategies are selected under exponential and suppressed growth phases of the population of hosts. Transitions between different fitness measures and conditions for extinction of hosts by parasites are analysed. An interesting result is the possibility of a continuum of fitness measures of parasites for the unsuppressed exponential growth of the host population.

中文翻译:

从巢穴彩票到主机彩票:连续的生长抑制模型受新生儿巢穴的可用性或寄生虫宿主的影响及其对生命史策略选择的影响

选择生物学在人口自由增长期间和平衡人口规模下以不同方式起作用的想法在理论生物学中已经存在很长时间了。它首先表示为rK选择概念,后来在关于生活史理论的适应性措施的辩论中得到澄清。与该主题有关的最新讨论集中在巢穴彩票机制和由此产生的新的人口增长模型。在这种机制的双相模型中,生长的抑制是由新生儿的自由巢位的缺乏引起的。在此之前,种群可以成倍增长。在本文中,分析了模型的连续版本及其选择特性。我们显示了在指数增长和抑制增长阶段以及处于均衡种群规模下运行的不同适应性指标之间的连续平稳过渡。然后,该模型扩展到寄生虫种群的情况,其中恒定数目的巢穴被其宿主种群的动力学所取代,在限制供应的作用。寄生虫策略是在宿主种群的指数和抑制生长阶段选择的。分析了不同的适应措施和寄生虫灭绝宿主的条件之间的转换。一个有趣的结果是,可以对寄生虫进行连续适度的适应措施,以抑制宿主种群的指数增长。
更新日期:2020-01-04
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