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Evidence of a significant marine plant diet in a Pleistocene caribou from Haida Gwaii, British Columbia, through compound-specific stable isotope analysis
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.palaeo.2020.110180
Cara Kubiak , Rolf Mathewes , Vaughan Grimes , Geert Van Biesen , M.P. Richards

Abstract The Northwest Coast of Canada was likely an important location for glacial refugia in the Late Pleistocene. Recently, a caribou (Rangifer tarandus) antler fragment was reported from Graham Island dating prior to the Fraser Glaciation (MIS 3; 48,200–45,200 cal yr BP). The high carbon and nitrogen stable isotope values found in the bulk collagen samples of this caribou prompted further investigation into its diet and palaeoecological context. Today, caribou in British Columbia face rapid population and range decline, and have been placed on threatened and endangered species lists by both the U.S. and Canadian governments. Further insights into this species and its responses to changing environmental conditions can both improve our understanding of the Late Pleistocene ecosystems of the Northwest Coast and add relevant data to modern conservation issues. We employed compound-specific carbon and nitrogen stable isotope analysis to the individual amino acids of antler collagen to better understand the isotopic signal of this specimen. Our results suggest a significant marine plant contribution to the caribou's spring–summer diet, potentially reflecting an intensive foraging behavior observed in some modern-day Rangifer tarandus populations under conditions of terrestrial resource restriction.

中文翻译:

通过化合物特异性稳定同位素分析,来自不列颠哥伦比亚省海达瓜伊的更新世驯鹿的重要海洋植物饮食证据

摘要 加拿大西北海岸可能是晚更新世冰川避难的重要场所。最近,在弗雷泽冰川(MIS 3;48,200–45,200 cal yr BP)之前,格雷厄姆岛报道了一个驯鹿(Rangifer tarandus)鹿角碎片。在这种驯鹿的大量胶原蛋白样品中发现的高碳和氮稳定同位素值促使对其饮食和古生态环境进行进一步调查。今天,不列颠哥伦比亚省的驯鹿面临着数量和分布范围的迅速下降,并已被美国和加拿大政府列入受威胁和濒危物种名单。进一步了解该物种及其对不断变化的环境条件的反应,既可以提高我们对西北海岸晚更新世生态系统的理解,又可以为现代保护问题增加相关数据。我们对鹿角胶原蛋白的各个氨基酸进行了化合物特异性碳和氮稳定同位素分析,以更好地了解该标本的同位素信号。我们的研究结果表明,海洋植物对驯鹿的春夏饮食有重要贡献,这可能反映了在陆地资源限制条件下,在一些现代 Rangifer tarandus 种群中观察到的密集觅食行为。我们对鹿角胶原蛋白的各个氨基酸进行了化合物特异性碳和氮稳定同位素分析,以更好地了解该标本的同位素信号。我们的研究结果表明,海洋植物对驯鹿的春夏饮食有重要贡献,这可能反映了在陆地资源限制条件下,在一些现代 Rangifer tarandus 种群中观察到的密集觅食行为。我们对鹿角胶原蛋白的各个氨基酸进行了化合物特异性碳和氮稳定同位素分析,以更好地了解该标本的同位素信号。我们的研究结果表明,海洋植物对驯鹿的春夏饮食有重要贡献,这可能反映了在陆地资源限制条件下,在一些现代 Rangifer tarandus 种群中观察到的密集觅食行为。
更新日期:2021-02-01
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