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首页> 外文期刊>Marine biology >Using Carbon And Nitrogen Isotopic Values Of Body Feathers To Infer Inter- And Intra-individual Variations Of Seabird Feeding Ecology During Moult
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Using Carbon And Nitrogen Isotopic Values Of Body Feathers To Infer Inter- And Intra-individual Variations Of Seabird Feeding Ecology During Moult

机译：利用体羽的碳和氮同位素值推断换羽过程中海鸟摄食生态的个体间和个体内变化

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摘要

To determine whether stable isotope measurements of body feathers can be used to investigate the isotopic niche of moulting (inter-nesting) adult seabirds, we examined the stable carbon (δ~(13)C) and nitrogen (δ~(15)N) isotopic composition of body feathers of breeding wandering albatrosses (Diomedea exulans) from Crozet Islands, southern Indian Ocean. First we showed that the isotopic composition of body feathers was not significantly different from that of wing feathers, being thus a safe alternative to flight feathers whose collection impairs the birds' flying ability. Second, we looked at the variances in δ~(13)C and δ~(15)N values resulting from the isotopic measurement of a single feather, four different feathers, and a pool of four feathers per bird, to delineate the best isotopic analytical procedure. A two-step protocol is proposed that allows investigating both the intra- and inter-individual components of the niche width of the species. In a first step, isotopic measurements on a single feather per bird are used to define isotopic specialist from isotopic generalist populations. In a second step and for generalist populations only, measurements on additional (three) feathers per bird are used to delineate type A from type B isotopic generalists (Bearhop et al. in J Anim Ecol 73:1007-1012, 2004). Third, from a biological point of view, our data showed different moulting isotopic niches for adult males and females, and also within female wandering albatrosses. Since the isotopic composition of body feathers in this species reflects that of wing feathers, our results suggest that, after validation, body feathers have the potential for investigating the foraging ecology of other Procellariiforms and seabirds during the poorly known inter-nesting period.
机译：为了确定人体羽毛的稳定同位素测量值是否可用于研究成年（嵌套）成年海鸟的同位素生态位，我们研究了稳定的碳（δ〜（13）C）和氮（δ〜（15）N）印度洋南部克罗泽岛的繁殖信天翁（Diomedea exulans）体羽毛的同位素组成。首先，我们证明了体羽的同位素组成与翼羽的同位素组成没有显着差异，因此可以作为飞行羽毛的安全替代品，而飞行羽毛的收集会损害鸟类的飞行能力。其次，我们研究了由一只羽毛，四种不同羽毛以及每只鸟的四根羽毛的同位素测量得出的δ〜（13）C和δ〜（15）N值的方差，以描绘出最佳的同位素分析程序。提出了两步协议，该协议允许调查物种生态位宽度的个体内和个体间成分。第一步，每只鸟的一根羽毛上的同位素测量值用于从同位素通才种群中定义同位素专家。在第二步骤中，并且仅对于多面手种群，使用每只鸟的额外（三根）羽毛的测量来从B型同位素多面手划定A型（Bearhop等人，J Anim Ecol 73：1007-1012，2004）。第三，从生物学的角度来看，我们的数据显示，成年雄性和雌性以及雌性游荡信天翁都具有不同的蜕皮同位素位。由于该物种中体羽的同位素组成反映了翼羽的同位素组成，因此我们的结果表明，经过验证，体羽具有在鲜为人知的相互嵌套期间调查其他Procellariiforms和海鸟的觅食生态的潜力。

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