Department of Biological and Environmental Sciences, University of Helsinki, FI-00014, Helsinki, Finland.
J Exp Biol. 2010 Apr;213(Pt 7):1042-8. doi: 10.1242/jeb.034132.
Metabolic rate is a highly plastic trait. Here I examine factors that influence the metabolic rate of the Glanville fritillary butterfly (Melitaea cinxia) in pupae and resting and flying adults. Body mass and temperature had consistent positive effects on metabolic rate in pupae and resting adults but not in flying adults. There was also a consistent nonlinear effect of the time of the day, which was strongest in pupae and weakest in flying adults. Flight metabolic rate was strongly affected by an interaction between the phosphoglucose isomerase (Pgi) genotype and temperature. Over a broad range of measurement temperatures, heterozygous individuals at a single nucleotide polymorphism (SNP) in Pgi had higher peak metabolic rate in flight, but at high temperatures homozygous individuals performed better. The two genotypes did not differ in resting metabolic rate, suggesting that the heterozygotes do not pay an additional energetic cost for their higher flight capacity. Mass-independent resting and flight metabolic rates were at best weakly correlated at the individual level, and therefore, unlike in many vertebrates, resting metabolic rate does not serve as a useful surrogate of the metabolic capacity of this butterfly.
代谢率是一个高度灵活的特征。在这里，我研究了影响琉璃蛱蝶（Melitaea cinxia）蛹和休息及飞行成虫代谢率的因素。在蛹和休息的成虫中，体重和温度对代谢率有一致的正向影响，但在飞行的成虫中则没有。此外，昼夜时间也有一致的非线性影响，在蛹中最强，在飞行的成虫中最弱。飞行代谢率受到磷酸葡萄糖异构酶（Pgi）基因型和温度之间相互作用的强烈影响。在广泛的测量温度范围内，Pgi 单核苷酸多态性（SNP）的杂合个体在飞行中具有更高的峰值代谢率，但在高温下，纯合个体表现更好。这两种基因型在休息代谢率上没有差异，这表明杂合个体不会为其更高的飞行能力付出额外的能量成本。在个体水平上，质量独立的休息和飞行代谢率的相关性最差，因此，与许多脊椎动物不同，休息代谢率不能作为这种蝴蝶代谢能力的有用替代指标。
