Using a multi-isotope approach to understand waterfowl movement in southern Africa

IF 2.6 2区 生物学 Q1 ORNITHOLOGY
Condor Pub Date : 2019-11-20 DOI:10.1093/condor/duz049
Gregory L Mutumi, Gregory L Mutumi, G. Cumming, G. Cumming, S. Sulliván, Alexandre Caron, Carlos Cáceres
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引用次数: 0

Abstract

ABSTRACT Many far-ranging species depend heavily on relatively small or temporary resources within a heterogeneous landscape. For waterfowl, most species rely on deep, permanent waterbodies as refugia from predators during annual flightless molt periods when synchronous loss and regrowth of the flight feathers occurs. The movements of ducks to and from molt sites are, however, poorly documented for most Afrotropical species and the dependencies of Afrotropical ducks on key sites are unclear, yet this information is integral to conservation and management efforts. We asked whether stable isotopes of wing feathers could be used to determine the molting origins of Afrotropical ducks in southern Africa. We analyzed isotope ratios of carbon, nitrogen, oxygen, and hydrogen in feathers from 4 different species across 5 different sites (wetlands, ponds, lakes) in South Africa, Zimbabwe, Mozambique, and Botswana. We observed differences among sites for all isotopes (P < 0.05), especially δ13C and δ15N. Based on these differences, we conducted linear discriminant function analysis (LDA) to assess the utility of these isotopes to assign birds to molt locations. We obtained a global classification accuracy = 0.59, although accuracies differed among sites. Our results demonstrate the potential of a multi-isotope approach to discriminate among specific molt locations and to provide an initial estimate of molt site. Rigorous documentation of molt site from wing feathers is plausible, but will require large sample sizes, extensive spatial coverage, and careful calibration.
使用多同位素方法来了解非洲南部水禽的运动
许多远游物种严重依赖于异质景观中相对较小或暂时的资源。对于水禽来说,在每年的飞羽同步脱落和再生的无飞期,大多数物种依赖于深的、永久的水体作为躲避捕食者的避难所。然而,对于大多数非洲热带物种来说,关于鸭子往返换壳地点的记录很少,非洲热带鸭子对关键地点的依赖性也不清楚,但这些信息对于保护和管理工作是不可或缺的。我们询问翅膀羽毛的稳定同位素是否可以用来确定非洲南部非洲热带鸭子的蜕皮起源。我们分析了来自南非、津巴布韦、莫桑比克和博茨瓦纳5个不同地点(湿地、池塘、湖泊)的4种不同物种羽毛中的碳、氮、氧和氢的同位素比率。各同位素位点间差异显著(P < 0.05),特别是δ13C和δ15N。基于这些差异,我们进行了线性判别函数分析(LDA)来评估这些同位素在确定鸟类蜕皮地点方面的效用。我们获得了全局分类精度= 0.59,尽管不同站点的精度不同。我们的研究结果证明了多同位素方法在区分特定蜕皮地点和提供蜕皮地点的初步估计方面的潜力。从翅膀羽毛中严谨地记录蜕皮地点是可行的,但需要大量的样本,广泛的空间覆盖和仔细的校准。
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来源期刊
Condor
Condor ORNITHOLOGY-
CiteScore
6.30
自引率
12.50%
发文量
46
审稿时长
6-12 weeks
期刊介绍: The Condor is the official publication of the Cooper Ornithological Society, a non-profit organization of over 2,000 professional and amateur ornithologists and one of the largest ornithological societies in the world. A quarterly international journal that publishes original research from all fields of avian biology, The Condor has been a highly respected forum in ornithology for more than 100 years. The journal is one of the top ranked ornithology publications. Types of paper published include feature articles (longer manuscripts) Short Communications (generally shorter papers or papers that deal with one primary finding), Commentaries (brief papers that comment on articles published previously in The Condor), and Book Reviews.
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