Friday Laurie E
University of Cambridge, Department of Zoology, Downing Street, Cambridge CB2 3EJ.
New Phytol. 1992 Jul;121(3):439-445. doi: 10.1111/j.1469-8137.1992.tb02944.x.
The partitioning of biomass between traps and leaves is a measure of the investment in carnivory of Utricularia vulgaris and is dependent on the relative values of three attributes: trap size, trap number and leaf size. Marked seasonal and individual variations in trap size, trap number and leaf size occur within a small population of U. vulgaris at Wicken Fen, Cambridgeshire, UK, with some plants consistently having fewer traps per leaf than others, and some smaller leaves than others, throughout the growing season. However, the three attributes vary independently, so that all combinations over the observed ranges of trap size, trap number and leaf size occur simultaneously in the population. In spite of the variation in the three constituent factors, the proportion of biomass invested in traps is close to 50% in the majority of plants and throughout most of the growing season. The contribution of traps to total biomass cannot be predicted from the number of traps per leaf. Although the proportion of biomass represented by traps is the most useful measure of a plant's investment in carnivory, the precise way in which the biomass is partitioned between a variable number of traps of different sizes may also be an important consideration in cost-benefit analyses.
捕虫囊与叶片之间生物量的分配是普通狸藻食肉性投入的一种衡量方式，并且取决于三个属性的相对值：捕虫囊大小、捕虫囊数量和叶片大小。在英国剑桥郡威肯沼泽地一小群普通狸藻中，捕虫囊大小、捕虫囊数量和叶片大小存在显著的季节性和个体差异，在整个生长季节中，一些植株每片叶子上的捕虫囊数量始终比其他植株少，一些叶片也比其他叶片小。然而，这三个属性是独立变化的，因此在种群中，捕虫囊大小、捕虫囊数量和叶片大小观察范围内的所有组合会同时出现。尽管这三个构成因素存在变化，但在大多数植株以及整个生长季节的大部分时间里，投入到捕虫囊的生物量比例接近50%。不能根据每片叶子上的捕虫囊数量来预测捕虫囊对总生物量的贡献。尽管捕虫囊所代表的生物量比例是衡量植物食肉性投入最有用的指标，但在成本效益分析中，生物量在不同数量和大小的捕虫囊之间的精确分配方式也可能是一个重要的考虑因素。
