Thomas V G
Comp Biochem Physiol A Comp Physiol. 1985;81(1):181-4. doi: 10.1016/0300-9629(85)90285-3.
Myoglobin concentration and myosin ATPase activity were measured in the pectoral muscle of wild spruce grouse (Dendragapus canadensis) and ruffed grouse (Bonasa umbellus), together with the weight of the Mm. pectoralis, supracoracoideus and heart. mATPase activities were similar in both species, but spruce grouse contained 15 times more myoglobin in the pectoralis muscle and the heart was three times heavier than that of the ruffed grouse. The relative mass of the flight muscles and wing loading were similar between species. Characteristics of the pectoral muscle of both grouse species reflect adaptations to predation and advertising displays. The glycolytic nature of the ruffed grouse pectoral muscle and small heart size is an adaptation to a sedentary existence within a small home range. The more oxidative pectoral muscle of spruce grouse together with its larger heart are adaptations to seasonal dispersals requiring more sustained flight.
测量了野生云杉松鸡（Dendragapus canadensis）和披肩鸡（Bonasa umbellus）胸肌中的肌红蛋白浓度和肌球蛋白ATP酶活性，同时测量了胸大肌、胸小肌和心脏的重量。两种松鸡的mATP酶活性相似，但云杉松鸡胸肌中的肌红蛋白含量是披肩鸡的15倍，且其心脏重量是披肩鸡的三倍。两种松鸡飞行肌的相对质量和翼载荷相似。两种松鸡胸肌的特征反映了它们对捕食和求偶炫耀的适应性。披肩鸡胸肌的糖酵解特性和较小的心脏尺寸是对其在小活动范围内 sedentary 生活方式的一种适应。云杉松鸡氧化程度更高的胸肌及其更大的心脏是对需要更持久飞行的季节性迁徙的适应。 （注：原文中“sedentary”可能有误，推测应为“sedentary”，暂按此翻译，若有误请根据正确信息调整）
