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首页> 外文期刊>Ecological Complexity >Warming alters density dependence, energetic fluxes, and population size in a model algae
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Warming alters density dependence, energetic fluxes, and population size in a model algae

机译:变暖改变了模型藻类中的密度依赖性,能量通量和种群大小

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A fundamental question in ecology is what determines the density of a population. Many populations may grow to a maximum density which is set by the interplay of resource availability and per capita resource requirements. Resource availability is determined in part by the kind of interactions occurring within a population, such that the total resource acquired by a population is a function of its size. Often taking the form of a power function with a scaling parameter <1, this scaling imposes density dependence on resource acquisition and metabolic rates of individuals. An increase in the scaling parameter signifies a reduction in density dependence that would allow a population to grow past its previous limits. We evaluated this possibility using laboratory populations of the algae Chlamydomonas reinhardtii grown at cold (20 ℃) and warm (25 ℃) temperatures in semi-continuous batch cultures. Warm populations rapidly developed larger cells and grew to a higher population density and total biovolume than the cold populations. Furthermore, the density dependence of metabolic rate was more severe in the cold, and for a given metabolic rate cells in the cold populations divided more quickly. These results suggest that a temperature-dependent life history set the strength of density dependence in these populations. Increasing temperature led to an increase in the resource scaling parameter and enabled the warm populations to escape the limits experienced by the cold populations.
机译:生态学中的一个基本问题是决定人口密度的因素。许多人口可能会增长到最大密度,这是由资源可用性和人均资源需求的相互作用所确定的。资源的可用性部分取决于种群内部发生的相互作用的类型,因此种群获得的总资源是其规模的函数。通常采用具有小于1的缩放参数的幂函数的形式,这种缩放将密度依赖于资源获取和个体的代谢率。缩放参数的增加表示密度依赖性的降低,这将使种群增长到超过其先前的极限。我们使用半连续分批培养的冷(20℃)和热(25℃)温度下生长的藻类莱茵衣藻实验室种群评估了这种可能性。温暖的种群比寒冷的种群迅速发展出更大的细胞,并增长到更高的种群密度和总生物量。此外,在寒冷条件下,代谢速率的密度依赖性更为严重,对于给定的代谢速率,寒冷人群中的细胞分裂更快。这些结果表明,温度依赖性的生活史决定了这些种群中密度依赖性的强度。温度升高导致资源缩放参数增加,并使温暖的种群摆脱了寒冷种群的限制。

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