Scaling of gas exchange cycle frequency in insects
Scaling of gas exchange cycle frequency in insects
复制标题
昆虫气体交换周期频率的缩放
作者：
J. Terblanche;C. R. White;T. Blackburn;E. Marais;S. Chown
此前，有人认为昆虫气体交换循环频率（fC）与质量无关，这使得昆虫与大多数其他动物不同，大多数其他动物的周期通常为质量-0.25。然而，关于昆虫的声明是基于对少数几个密切相关的类群的研究，这些类群的大小范围相对较小。此外，还不知道气体交换模式的类型（不连续与循环）是否影响fc-质量标度关系。在这里，我们分析了一个大型数据库，研究种间的FC质量缩放。此外，我们调查的影响模式的气体交换的FC-缩放关系，使用传统的和遗传独立的方法。循环频率的尺度为质量-0.280（考虑到遗传非独立性和气体交换模式时），与质量-0.25没有显著差异。的fC-质量关系的斜率是浅的一个显着较低的截距的物种显示不连续的气体交换比那些显示的循环模式，可能是由于较低的代谢率在前者。因此，就气体交换fC的缩放而言，昆虫似乎与其他动物没有什么不同，尽管气体交换fC可能以不同的方式缩放不同的模式。
Previously, it has been suggested that insect gas exchange cycle frequency (fC) is mass independent, making insects different from most other animals where periods typically scale as mass−0.25. However, the claim for insects is based on studies of only a few closely related taxa encompassing a relatively small size range. Moreover, it is not known whether the type of gas exchange pattern (discontinuous versus cyclic) influences the fC–mass scaling relationship. Here, we analyse a large database to examine interspecific fC–mass scaling. In addition, we investigate the effect of mode of gas exchange on the fC–scaling relationship using both conventional and phylogenetically independent approaches. Cycle frequency is scaled as mass−0.280 (when accounting for phylogeneticnon-independence and gas exchange pattern), which did not differ significantly from mass−0.25. The slope of the fC–mass relationship was shallower with a significantly lower intercept for the species showing discontinuous gas exchange than for those showing the cyclic pattern, probably due to lower metabolic rates in the former. Insects therefore appear no different from other animals insofar as the scaling of gas exchange fC is concerned, although gas exchange fC may scale in distinct ways for different patterns.