Stable Isotopes Suggest Low Site Fidelity in Bar-headed Geese (Anser indicus) in Mongolia: Implications for Disease Transmission.
Stable Isotopes Suggest Low Site Fidelity in Bar-headed Geese (Anser indicus) in Mongolia: Implications for Disease Transmission.
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DOI：
10.1675/063.038.0201
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发表时间：
2015-06
期刊：
影响因子：
0.3
通讯作者：
Newman SH
中科院分区：
文献类型：
--
作者：
Bridge ES;Kelly JF;Xiao X;Batbayar N;Natsagdorj T;Hill NJ;Takekawa JY;Hawkes LA;Bishop CM;Butler PJ;Newman SH
在研究疾病传播和生物保护，特别是迁徙物种时，种群关联性是一个重要的考虑因素。确定不同的亚群在年周期的不同阶段如何以及何时混合可以帮助确定重要的地理区域或特征作为保护工作的目标，并可以帮助我们了解大陆规模的疾病传播。在这项研究中，氢和碳的稳定同位素的轮廓羽毛被用来评估的程度，在蒙古中北部捕获的斑头雁（安瑟indicus）之间的蜕皮现场保真度。从活跃的蜕皮斑头鹅（n = 61），和一些个别的样品，包括新生长的羽毛（仍在鞘）和旧的，磨损的羽毛从鸟的前一次蜕皮（n = 21）。虽然新羽毛和旧羽毛的平均氢同位素比率没有差异，但旧羽毛的同位素差异大约是新羽毛的三倍，这表明这些鸟类每年使用不同的地理位置。为了进一步验证这一结论，来自isoMAP网站的在线数据和建模工具被用来生成每根羽毛起源的概率景观。旧羽毛可能的蜕皮地点比新羽毛更广泛，这支持了蜕皮地点保真度低的前景。这一发现表明，根据单一年度周期的数据，种群的连通性将大于预期，即使在蒙古这样的地区，疾病的传播也可能很快，因为斑头雁通常在小的孤立群体中繁殖。
Population connectivity is an important consideration in studies of disease transmission and biological conservation, especially with regard to migratory species. Determining how and when different subpopulations intermingle during different phases of the annual cycle can help identify important geographical regions or features as targets for conservation efforts and can help inform our understanding of continental-scale disease transmission. In this study, stable isotopes of hydrogen and carbon in contour feathers were used to assess the degree of molt-site fidelity among Bar-headed Geese (Anser indicus) captured in north-central Mongolia. Samples were collected from actively molting Bar-headed Geese (n = 61), and some individual samples included both a newly grown feather (still in sheath) and an old, worn feather from the bird’s previous molt (n = 21). Although there was no difference in mean hydrogen isotope ratios for the old and new feathers, the isotopic variance in old feathers was approximately three times higher than that of the new feathers, which suggests that these birds use different and geographically distant molting locations from year to year. To further test this conclusion, online data and modeling tools from the isoMAP website were used to generate probability landscapes for the origin of each feather. Likely molting locations were much more widespread for old feathers than for new feathers, which supports the prospect of low molt-site fidelity. This finding indicates that population connectivity would be greater than expected based on data from a single annual cycle, and that disease spread can be rapid even in areas like Mongolia where Bar-headed Geese generally breed in small isolated groups.
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