Effects of the introduced ectoparasite Philornis downsi on haemoglobin level and nestling survival in Darwin's Small Ground Finch (Geospiza fuliginosa)
Effects of the introduced ectoparasite Philornis downsi on haemoglobin level and nestling survival in Darwin's Small Ground Finch (Geospiza fuliginosa)
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DOI：
10.1111/j.1442-9993.2006.01553.x
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发表时间：
2006-02-01
期刊：
影响因子：
1.5
通讯作者：
Fessl, B
中科院分区：
文献类型：
--
作者：
Dudaniec, RY;Kleindorfer, S;Fessl, B
对加拉帕戈斯群岛达尔文小地雀Geospiza fuliginosa(Geospizinae)雏鸟的寄生生理影响和寄生适合度成本进行了研究。全血血红蛋白(Hb)浓度被用来衡量宿主对体外寄生虫的反应，因为它具有很高的重复性和有效性，以及它在影响健康的有氧活动中的关键作用，如飞行能力和雏鸟乞讨强度。在没有血液寄生虫的情况下，羽绒毛虫体外寄生幼虫的数量增加与雏鸟中较低的Hb水平密切相关。此外，未成熟红细胞计数与Hb水平呈负相关，与绒毛强度呈正相关。寄生率高的雏鸟死亡率较高，这一点随窝卵大小的不同而异。我们的结果提供了证据，证明加拉帕戈斯特有的鸟类种群在生理上受到了登革热的影响，并由于体外寄生而经历了相当大的适应成本。
The physiological impacts and fitness costs of parasitism by an introduced ectoparasitic fly, Philornis downsi (Muscidae), were studied in nestlings of Darwin's Small Ground Finch, Geospiza fuliginosa (Geospizinae), on the Galapagos Archipelago. Whole blood haemoglobin (Hb) concentration was used to measure host response to ectoparasitism due to its high repeatability and validity, as well as for its key role in aerobic activities that affect fitness, such as flight capacity and nestling begging intensity. Increased numbers of ectoparasitic larvae of P. downsi were strongly correlated with lower Hb levels in nestlings in the absence of blood parasites. Furthermore, immature red blood cell counts were negatively correlated with Hb level and positively correlated with P. downsi intensity. Nestlings with high levels of parasitism suffered higher mortality, which varied with clutch size. Our results provide evidence that endemic Galapagos bird populations are physiologically compromised by P. downsi and experience substantial fitness costs due to ectoparasitism.