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Geographical variation in the size of body organs in seabirds

机译：海鸟体内器官大小的地理变化

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1. The size of body organs shows adaptive temporal variation in many animal species. The variation in the size of body organs was examined to see if it is also a component of local adaptation to geographical variation in ecological conditions. 2. Major body organs were measured in five species of Icelandic seabirds sampled from two areas where birds experience slightly different ecological conditions. Between area differences in ecological conditions were consistent among the study species, allowing tests of the generality of ecological effects on organ size. 3. All major body organs showed geographical size variation. Livers and kidneys were larger in locations where daily energy expenditure was expected to be higher, small intestines were heavier where food was of lower energy density; stomachs were heavier where food was less digestible; heart and flight muscle were larger where flight costs were greater. 4. It is concluded that adaptive variation in organ size may be an important means by which animals optimeize exploitation of their local environment, and may be a proximate factor in intraspecific life-history and metabolic variation between geographically separate population.
机译：1.身体器官的大小显示出许多动物物种的适应性时间变化。检查了人体器官大小的变化，以了解它是否也是局部适应生态条件地理变化的组成部分。 2.在两个鸟类的生态条件稍有不同的地区采样了五种冰岛海鸟的主要器官，进行了测量。不同物种之间生态条件的区域差异在研究物种之间是一致的，从而可以测试对器官大小的生态影响的普遍性。 3.所有主要身体器官均表现出地理大小差异。在预计每日能量消耗较高的地方，肝脏和肾脏较大，在食物能量密度较低的地方，小肠较重。胃较重，食物难以消化;心脏和飞行肌肉更大，而飞行成本更高。 4.结论是，器官大小的适应性变化可能是动物适时利用其当地环境的重要手段，并且可能是地理上不同种群之间种内生活史和代谢变化的近因。

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