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Validating the use of bulk tissue stable isotope and amino acid δ15N values measured in molted hair and epidermis of elephant seals to assess temporal foraging niche specialization
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2021-09-02 , DOI: 10.3354/meps13772 N Lübcker 1, 2 , SD Newsome 2 , MN Bester 1 , PJN de Bruyn 1
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2021-09-02 , DOI: 10.3354/meps13772 N Lübcker 1, 2 , SD Newsome 2 , MN Bester 1 , PJN de Bruyn 1
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ABSTRACT: The degree of dietary generalization versus specialization exhibited by populations can impact their ability to respond to changing environmental conditions. Naturally shed hair and epidermis are easily collected and may provide a suitable substrate for stable isotope analysis to assess trophic niche specialization. Whether fasting influences the isotopic composition of molted tissues has not been assessed. Here, we gauged the validity of using carbon (δ13C) and nitrogen (δ15N) isotope analysis of molted hair and the outermost epidermis as proxies to study the foraging ecology of southern elephant seals Mirounga leonina at Marion Island in the southern Indian Ocean. Similarity in both bulk tissue (δ13C and δ15N) and amino acid (δ15N) isotope values of molted tissues and whiskers known to reflect fasting confirmed that physiological changes associated with fasting influenced hair and epidermis isotope values. We recommend caution when using the isotopic composition of molted hair and epidermis to make ecological inferences regarding diet and/or movement. Despite these limitations, molted hair can be used to detect extreme foraging behaviors, which we show using an extensive data set of hair sampled from marked individuals (n = 331) that hauled out on Marion Island during the 2012-2013 annual pelage molt. Other factors, such as ontogenetic shifts in diet and potential environmental (baseline) isotopic variation, also influence hair δ13C and δ15N values, which complicates the use of isotopic data from molted tissues to assess the temporal consistency of an individuals’ isotopic niche.
中文翻译:
验证使用大量组织稳定同位素和氨基酸 δ15N 值在象海豹的蜕皮和表皮中测量,以评估临时觅食生态位专业化
摘要:人群表现出的饮食泛化与专业化的程度会影响他们对不断变化的环境条件做出反应的能力。自然脱落的头发和表皮很容易收集,可以为稳定同位素分析提供合适的底物,以评估营养生态位专业化。尚未评估禁食是否影响蜕皮组织的同位素组成。在这里,我们评估了使用脱毛毛发和最外层表皮的碳 (δ 13 C) 和氮 (δ 15 N) 同位素分析作为代理研究印度南部马里恩岛南部象海豹Mirounga leonina觅食生态的有效性海洋。两种大块组织的相似性(δ 13 C 和 δ 15N) 和氨基酸 (δ 15 N) 同位素值的蜕皮组织和胡须已知反映禁食证实与禁食相关的生理变化影响头发和表皮同位素值。我们建议在使用蜕皮的头发和表皮的同位素组成对饮食和/或运动进行生态推断时要谨慎。尽管有这些限制,蜕皮仍可用于检测极端的觅食行为,我们使用从 2012-2013 年度皮毛蜕皮期间在马里恩岛拖出的标记个体(n = 331)的大量毛发样本进行展示。其他因素,例如饮食中的个体发生变化和潜在的环境(基线)同位素变化,也会影响头发 δ 13 C 和 δ 15N 值,这使得使用来自蜕皮组织的同位素数据来评估个体同位素生态位的时间一致性变得复杂。
更新日期:2021-09-02
中文翻译:
验证使用大量组织稳定同位素和氨基酸 δ15N 值在象海豹的蜕皮和表皮中测量,以评估临时觅食生态位专业化
摘要:人群表现出的饮食泛化与专业化的程度会影响他们对不断变化的环境条件做出反应的能力。自然脱落的头发和表皮很容易收集,可以为稳定同位素分析提供合适的底物,以评估营养生态位专业化。尚未评估禁食是否影响蜕皮组织的同位素组成。在这里,我们评估了使用脱毛毛发和最外层表皮的碳 (δ 13 C) 和氮 (δ 15 N) 同位素分析作为代理研究印度南部马里恩岛南部象海豹Mirounga leonina觅食生态的有效性海洋。两种大块组织的相似性(δ 13 C 和 δ 15N) 和氨基酸 (δ 15 N) 同位素值的蜕皮组织和胡须已知反映禁食证实与禁食相关的生理变化影响头发和表皮同位素值。我们建议在使用蜕皮的头发和表皮的同位素组成对饮食和/或运动进行生态推断时要谨慎。尽管有这些限制,蜕皮仍可用于检测极端的觅食行为,我们使用从 2012-2013 年度皮毛蜕皮期间在马里恩岛拖出的标记个体(n = 331)的大量毛发样本进行展示。其他因素,例如饮食中的个体发生变化和潜在的环境(基线)同位素变化,也会影响头发 δ 13 C 和 δ 15N 值,这使得使用来自蜕皮组织的同位素数据来评估个体同位素生态位的时间一致性变得复杂。