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首页> 外文期刊>Physiological Zoology >Changes in lean mass and in organs of nutrient assimilation on a long-distance passerine migrant at a springtime stopover site
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Changes in lean mass and in organs of nutrient assimilation on a long-distance passerine migrant at a springtime stopover site

机译：春季中途停留地长途雀形目迁徙者的瘦体重和养分吸收器官的变化

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The primary energy source for migration is fat, but nonfat body components can vary in concert with lipid stores in some migrants. The goals of this study were (1) to validate for a small Old World warbler (the blackcap, Sylvia atricapilla) nondestructive methods to measure lean and fat mass, (2) to quantify the relative contribution of lean mass to body-mass change of migrants, and (3) to ascertain what lean tissues might be involved. Using total-body electrical conductivity and dilution space of isotope-labeled water, we measured lean and fat mass with precision of 3 percent-4 percent and 10 percent-15 percent, respectively. In newly arrived migrants with apparently similar structural size (tarsus length), there was a significant positive correlation between lean mass and fat mass; 37 percent of each unit change was lean mass and 63 percent fat. Captive blackcaps, fed ad lib. for 7 d, gained body mass, with 40 percent being lean mass. When captives were fasted 1.5-3 d, both body mass and lean mass declined; lean mass accounted for 42 percent of body mass lost. In fasted birds, the masses of liver, stomach, and small intestine declined and accounted for 44 percent of the total lean mass decline, a disproportionate amount considering that these organs make up only 11 percent of a blackcap's lean mass. In freshly captured blackcaps, organ masses were positively correlated with lean mass minus the organ masses, suggesting that these organs are a source of lean mass catabolized by migrants. We conclude that migrants' need for protein to rebuild lean mass during stopover could constrain diet selection and require increased foraging time, thus slowing mass gain and lengthening overall migration time. Also, stopover time may be lengthened if time is required to rebuild atrophied organs that are important in food digestion and assimilation.
机译：迁移的主要能量来源是脂肪，但某些肥胖者体内的脱脂脂肪成分会与脂质的存储量发生变化。这项研究的目标是（1）验证一种小的旧世界莺（blackcap，西尔维亚atricapilla）无损测量脂肪和脂肪的方法，（2）量化脂肪对体重变化的相对贡献。 （3）确定可能涉及哪些瘦组织。使用同位素标记的水的整体电导率和稀释空间，我们测量的瘦肉和脂肪质量分别为3％-4％和10％-15％。在结构尺寸（structural体长度）明显相似的新移民中，瘦体重和脂肪体重之间存在显着的正相关。每个单位更改的37％是瘦肉和63％的脂肪。俘虏黑帽，由ad lib提供。持续7天，体重增加，其中40％为瘦体重。当俘虏禁食1.5-3 d时，体重和瘦体重都下降了。瘦体重占失去的体重的42％。在禁食的鸟类中，肝脏，胃和小肠的质量下降，占瘦肉总量下降的44％，考虑到这些器官仅占黑cap瘦肉总量的11％，这一比例不成比例。在新鲜捕获的黑cap中，器官质量与瘦质量减去器官质量呈正相关，这表明这些器官是移民代谢的瘦质量的来源。我们得出的结论是，在中途停留期间，移民需要蛋白质来重建瘦肉，这可能会限制饮食的选择，并需要增加觅食时间，从而减慢质量增长并延长总体迁徙时间。另外，如果需要时间来重建对食物消化和吸收很重要的萎缩性器官，则停留时间可能会延长。

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