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首页> 外文期刊>General and comparative endocrinology >Environmental and hormonal correlates of immune activity in a cooperatively breeding tropical bird.
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Environmental and hormonal correlates of immune activity in a cooperatively breeding tropical bird.

机译：在合作繁殖的热带鸟类中免疫活性的环境和激素相关性。

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Because climatic patterns in temperate regions are generally predictable, species can allocate resources adaptively among competing physiological processes before environmental conditions change. In the semi-arid tropics where environments are seasonal, but highly unpredictable, allocation decisions may be more sensitive to short-term fluctuations in conditions. We asked (i) whether investments in immune function were affected by inter-annual variation in rainfall and (ii) whether corticosterone and prolactin, two hormones that modulate immune activity in other vertebrates, predict environmentally induced alterations in immune activity in cooperatively breeding superb starlings (Lamprotornis superbus). Superb starlings inhabit African savannas characterized by high among-year variation in rainfall, which influences their breeding life histories and hormone levels. We quantified bactericidal capacity of plasma, or bacterial killing, and prolactin and corticosterone concentrations in blood samples collected over a four year period during the dry season prior to breeding, as this is the period when reproductive roles are determined in this species and when rainfall is most variable. We found that bacterial killing was weakest in the driest year of the study, and we detected a positive relationship between bacterial killing and prolactin, but not a negative relationship with corticosterone. Together these results suggest that prolactin may mediate rainfall-induced changes in immune activity in superb starlings. This study is the first to examine relationships between prolactin and an index of constitutive, innate immunity in birds, and suggests that even species inhabiting unpredictable environments adjust their physiological priorities to environmental conditions, perhaps via prolactin.
机译：由于温带地区的气候模式通常是可以预测的，因此物种可以在环境条件改变之前在竞争的生理过程之间自适应地分配资源。在半干旱的热带地区，环境是季节性的，但高度不可预测，因此分配决策可能对条件的短期波动更为敏感。我们询问（i）免疫功能的投资是否受到降雨的年际变化的影响;以及（ii）皮质酮和催乳激素（调节其他脊椎动物免疫活性的两种激素）是否预示着环境中诱导合作繁殖的优质star鸟的免疫活性发生变化。 （Lamprotornis超级巴士）。雄性八哥生活在非洲大草原中，其特征是每年的降雨量变化很大，这影响了它们的繁殖生活史和激素水平。我们在繁殖之前的干燥季节的四年内，对采集的血液样本中血浆的杀菌能力（或细菌杀灭能力）以及催乳素和皮质酮浓度进行了量化，因为这是确定该物种的生殖作用和降雨时间的时期。变化最大。我们发现，在研究的最干燥的一年中，细菌的杀灭作用最弱，并且我们发现细菌的杀灭作用与催乳激素之间存在正相关，而与皮质酮之间却没有负相关。这些结果共同表明，催乳素可能介导降雨诱导雄性八哥的免疫活性变化。这项研究是首次研究催乳素与鸟类的组成型先天免疫指标之间的关系，并表明即使居住在无法预测的环境中的物种也可能通过催乳素将其生理优先级调整为环境条件。

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