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Mass fluctuation in breeding females males and helpers of the Florida scrub-jay Aphelocoma coerulescens

机译：佛罗里达州灌丛周杰伦Aphelocoma coerulescens雌雄和助手的繁殖质量波动

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Much evidence suggests that birds actively regulate their body mass reserves relative to their energy needs. Energy requirements during reproduction may differ in relation to sex-specific behavioural roles or, in the case of cooperative breeders, breeders relative to helpers. We measured body mass of free-living Florida scrub-jays throughout the nesting season by training them to land on an electronic balance. Jays exhibited a pattern of diurnal linear mass gain, from morning to afternoon. Day-to-day mass fluctuations, defined as the difference between mass on two consecutive days, were small (>80% were within 2 g, less than 3% of the mass of an adult bird) for all classes of jays: female breeders, male breeders and prebreeding helpers. The jays, which live in subtropical south-central Florida, did not exhibit changes in day-to-day mass fluctuation relative to weather or climate variables or calendar date. Day-to-day mass fluctuations influenced mass fluctuation between the following third and fourth days. These changes were usually compensatory, indicating that jays are able to regulate their body mass on a short-term basis, despite strong differences in their roles in reproduction. During reproduction, jays have a relatively predictable and abundant food supply, thus the appropriate strategy may be to maintain a stable body mass that balances some energy reserves against maintaining a low body mass for efficient flight, as required during reproduction.
机译：许多证据表明，鸟类根据其能量需求积极调节其体重储备。繁殖过程中的能量需求可能会因性别特定的行为角色而有所不同，或者在合作育种者的情况下，育种者相对于助手的能量需求可能有所不同。我们通过训练它们在电子天平上着陆，测量了整个嵌套季节中自由活动的佛罗里达灌木rub的体重。从早上到下午，杰伊斯表现出昼夜线性质量增加的规律。日常质量波动（定义为连续两天之间的质量差）对于所有类型的ay鸟都很小（> 80％在2 g以内，不到成年鸟质量的3％）：雌性饲养员，男性育种人员和预育助手。居住在亚热带中南部佛罗里达州的美洲虎，相对于天气或气候变量或日历日期，其日常质量波动没有变化。日常质量波动会影响接下来的第三天和第四天之间的质量波动。这些变化通常是补偿性的，表明尽管它们在繁殖中的作用存在很大差异，但它们能够在短期内调节其体重。在繁殖过程中，周杰伦具有相对可预测的丰富食物供应，因此适当的策略可能是维持稳定的体重，从而平衡一些能量储备，同时维持繁殖过程中所需的低体重以有效飞行。

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