Lotz L A P, Blom C W P M
Department of Dune Research, "Weevers' Duin", Institute for Ecological Research, Duinzoom 20a, 3233 EG, Oostvoorne, the Netherlands.
Oecologia. 1986 Apr;69(1):25-30. doi: 10.1007/BF00399033.
Plasticity in life-history characteristics was investigated in three populations of Plantago major L. ssp. pleiosperma (Pilger), a self-compatible, wind pollinated species with a high self-fertilization rate. The populations studied were selected for their marked differences in biomass accumulation and habitat characteristics such as nutrient availability and interspecific interaction. Plants, raised from seeds collected at three sites, were grown in a greenhouse at three nutrient levels. In addition, a reciprocal transplant experiment was carried out. In both experiments variances in variables of growth and reproduction were largely due to environmental factors. Besides this overall result, population and population x environment interaction effects existed for most of the variables. Differences in plasticity between populations were further analysed. In the greenhouse experiment plants from a river-side population showed a high degree of plasticity in reproductive effort, whereas plants from two other populations, one series from a beach plain and the other from a salt meadow, showed a high degree of plasticity in shoot-root ratio. Plasticity in biomass allocation to either vegetative or generative parts is suggested to be an important response to selective forces related to either interspecific competition or temporal variability.
对大车前（Plantago major L. ssp. pleiosperma (Pilger)）的三个种群的生活史特征可塑性进行了研究。大车前是一种自交亲和、风媒传粉且自交率高的物种。所研究的种群因其在生物量积累以及诸如养分有效性和种间相互作用等栖息地特征方面存在显著差异而被选中。将从三个地点采集的种子培育出的植株，在温室中于三种养分水平下生长。此外，还进行了 reciprocal transplant experiment（此处原文可能有误，推测为“ reciprocal transplant experiment”，即互作移植实验）。在这两个实验中，生长和繁殖变量的差异在很大程度上归因于环境因素。除了这个总体结果外，大多数变量还存在种群以及种群与环境的交互作用效应。对种群之间的可塑性差异进行了进一步分析。在温室实验中，来自河边种群的植株在繁殖投入方面表现出高度可塑性，而来自另外两个种群的植株，一个种群来自海滩平原，另一个来自盐沼草甸，在茎叶比方面表现出高度可塑性。生物量分配到营养部分或生殖部分的可塑性被认为是对与种间竞争或时间变异性相关的选择压力的重要响应。
