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首页> 外文期刊>Journal of Avian Biology >Time-keeping programme can explain seasonal dynamics of leukocyte profile in a migrant bird
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Time-keeping programme can explain seasonal dynamics of leukocyte profile in a migrant bird

机译：时间保留程序可以解释移民鸟类白细胞谱的季节性动态

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It has been proposed that immune functioning in wild animals is shaped by the trade-off between a probability of encountering pathogens and an availability of resources for maintaining immune system in active state. Due to resources' seasonality one can expect that immune functioning, e.g. absolute and relative counts of white blood cells, WBC (leukocyte profile) also follows an annual cycle. However, dynamics of the seasonal changes of leukocyte profile are controversial and specific inquiries so far addressed only a portion of annual cycle. To study the seasonal dynamics of the leukocyte profile and to test its possible endogenous basis we experimentally simulated annual cycle in a migratory passerine bird, chiffchaff Phylloscopus collybita abietinus. We report here a clear seasonal pattern of leukocyte profile in that species. The highest WBC counts were observed during pre-alternate moult and the lowest during the subsequent spring migration; the seasonal dynamics of HL ratio showed the opposite tendency. Surprisingly, HL ratios during autumn migration were relatively low, indicating little to no stress. Observed seasonal changes in controlled experimental conditions suggest an existence of time-keeping programme underlying these variations. Additionally we found negative relationship between the body condition index and WBC counts and positive relationship with HL (heterophil to lymphocyte) ratio; these findings are controversial with the data obtained with other bird species in wild populations. Understanding the origins of variation of leukocyte profile per se and in relation with other parameters of physiological condition can be a useful tool in studying physiological response to environmental changes.
机译：已经提出，野生动物中的免疫功能是通过遇到病原体的概率与用于在活跃状态下维持免疫系统的资源之间的折衷的折衷。由于资源的季节性，人们可以期望免疫功能，例如免疫功能。白细胞的绝对和相对计数，WBC（白细胞谱）也遵循年度周期。然而，迄今为止只有一部分年度周期的一部分，白细胞谱的季节性变化的动态是有争议的和具体的查询。为研究白细胞谱的季节性动态，并测试其内源性基础，我们在迁徙乘鹿鸟类中进行实验模拟年循环，Chiffchaff phylloscopus collybita antiinus。我们在此报告该物种中的白细胞剖面清晰的季节性模式。在预交替换羽期间观察到最高的WBC计数，并且在随后的弹簧迁移期间最低; HL比的季节性动态表现出相反的趋势。令人惊讶的是，秋季迁移期间的HL比率相对较低，表明没有压力。观察到受控实验条件的季节变化表明存在时间保持时间的措施这些变化。此外，我们发现身体状况指数和WBC计数和与HL（handophil至淋巴细胞）比的阳性关系之间的负面关系;这些发现与野生群体中的其他鸟类获得的数据有争议。了解白细胞谱的变异的起源本身并与生理病症的其他参数相关，可以是研究对环境变化的生理反应的有用工具。

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