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首页> 外文期刊>Journal of Avian Biology >Uropygial gland size correlates with feather holes, body condition and wingbar size in the house sparrow Passer domesticus
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Uropygial gland size correlates with feather holes, body condition and wingbar size in the house sparrow Passer domesticus

机译：雀巢的大小与家麻雀的羽毛孔，身体状况和翼杆大小相关

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The uropygial gland is an organ exclusive of birds that secretes an oily substance, the uropygial secretion, the functions of which are still debated. One of the proposed hypothesis is its possible action against chewing lice (order Phthiraptera), a group of avian ectoparasites that feed on feathers, causing different types of harm. However, this hypothesis lacks support. The present study analyses the relationship between uropygial gland size and the number of feather holes (which is correlated with the load of chewing lice) in the house sparrow Passer domesticus. Moreover, the relationship between the uropygial gland size and different aspects of sparrow health (body condition, immunocompetence and haematocrit), as well as sexually selected traits in males (badge and wingbar size), is tested. The results show a negative correlation between uropygial gland size and number of feather holes, a result found both years of the study. This result supports the hypothesis that uropygial secretion is used against chewing lice. Uropygial gland size also correlated positively with body condition (residuals of body mass relative to tarsus length) and immunocompetence, being therefore related to bird health. After a year in captivity, with resources provided ad libitum, no correlation was found between individual uropygial gland size and body condition or haematocrit, perhaps because the negative effect that chewing lice exert on bird health was offset by captivity conditions. Uropygial gland size was not correlated with badge size, but it was correlated with wingbar size, which furthermore supports the contention that this sexually selected signal acts as an indicator of lice resistance in the house sparrow. In summary, this study supports the idea of a positive relationship between uropygial gland and bird health in the house sparrow, the gland secretion affording resistance against chewing lice.
机译：尿py腺是一种鸟类器官，不包括分泌油性物质的鸟尿py分泌物，其功能尚有争议。提出的假设之一是它可能对咀嚼虱子（Phthiraptera）有作用，后者是一群以羽毛为食的禽类外寄生虫，造成不同类型的伤害。但是，该假设缺乏支持。本研究分析了家麻雀Passer domesticus中尿路腺大小与羽毛孔数量（与咀嚼虱子的负荷相关）之间的关系。此外，测试了尿道腺大小与麻雀健康的不同方面（身体状况，免疫能力和血细胞比容）之间的关系，以及雄性的性选择特征（徽章和侧翼大小）之间的关系。结果表明，在两年的研究中，尿道腺大小与羽孔数之间呈负相关。该结果支持以下假设：尿py分泌物用于抵抗咀嚼虱子。尿腺的大小也与身体状况（相对于tar架长度的体重残留量）和免疫能力呈正相关，因此与鸟类健康有关。圈养一年后，随便提供资源，单个尿壶腺的大小与身体状况或血细胞比容之间没有相关性，这可能是因为咀嚼虱对鸟类健康的负面影响已被圈养状况所抵消。尿腺的大小与徽章的大小无关，但与翼板的大小有关，这进一步支持了这种有选择的信号充当麻雀抵抗虱子的指标的争论。总而言之，这项研究支持了在屋麻雀中尿道腺与鸟类健康之间呈正相关的想法，该腺体分泌物提供了对咀嚼虱子的抵抗力。

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