气候变化领域集成服务门户(CCPortal): High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate; ecology; and diet in ancient proboscideans

CCPortal

DOI	10.1016/j.palaeo.2020.109962
	High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate; ecology; and diet in ancient proboscideans
	Uno K.T.; Fisher D.C.; Schuster G.; Wittemyer G.; Douglas-Hamilton I.; Omondi P.; Litoroh M.; Cerling T.E.
发表日期	2020
ISSN	0031-0182
卷号	559
英文摘要	Stable isotope ratios in tissues of large mammalian herbivores record diet and climate information integrated over large spatial areas and can be used to study modern and fossil ecosystems. Sound interpretation of data requires that tissue growth rates be determined accurately and that ecological and behavioral variables that influence stable isotope ratios of tissues be measured and related to experienced environmental conditions assessed through field observations, remote sensing data, and meteorological records. If well-understood in modern herbivores, stable isotopes from closely-related extinct taxa have tremendous potential for resolving paleodiet, paleoenvironment, and paleoclimate of terrestrial ecosystems. We present multiyear, high-resolution (i.e., weekly) stable isotope records from bioapatite in tusk dentin (δ13Cdentin and δ18Odentin) and tail hair (δ13Chair and δ15Nhair) of an African elephant (Loxodonta africana) from Kenya that was fitted with a GPS collar intermittently over a five year period and observed for nearly a decade. GPS and observational data provide behavioral, life history, and location information. Normalized Difference Vegetation Index (NDVI), precipitation, and isotopic data from plants and water provide further constraints for interpreting isotope profiles. We determine tusk and hair growth rates using a combination of histological and geochemical approaches, including bomb-curve radiocarbon, that confirm approximately weekly resolution in the stable isotope profiles. Tusk dentin isotope profiles spanning the periods 1982 to 1987 and 2000 to 2006 record weekly variability in δ13Cdentin, where increases of up to 4.5‰ from baseline values due to diet switches from predominantly C3 browsing to mixed C3 browsing and C4 grazing occur during the twice-yearly (biannual) rainy seasons. The δ13Chair values show a similar trend. The δ13C profiles served as a proxy for seasonal changes in rainfall, vegetation, and diet. The δ18O of tusk bioapatite varied approximately biannually up to 5‰, likely reflecting increases in the proportion of plant water ingested during the wet season. Using a least squares inverse filter, we show that NDVI can be used to predict δ13C of dentin and vice versa, offering the possibility to reconstruct seasonal changes in vegetation and rainfall in the geologic past. Our results demonstrate that high-resolution tusk isotope profiles serve as a proxy for seasonality of diet and precipitation, and thus can be used to reconstruct aspects of elephant life history, vegetation, and climate at unprecedented resolution from modern and fossil proboscidean samples. © 2020 Elsevier B.V.
英文关键词	Carbon; Histology; Ivory; Life history; Oxygen; Paleoecology
语种	英语
scopus关键词	C3 plant; C4 plant; carbon isotope; data interpretation; diet; elephant; environmental conditions; GPS; hair; herbivore; NDVI; remote sensing; satellite data; seasonal variation; stable isotope; tooth; Kenya; Loxodonta; Loxodonta africana; Mammalia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150323
作者单位	Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, United States; Museum of Paleontology and Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109-1085, United States; King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia; Department of Fish, Wildlife and Conservation Biology, Colorado State University, Fort Collins, CO 80523, United States; Save the Elephants, P.O. Box 54667, Nairobi, 00200, Kenya; Department of Zoology, Oxford University, Oxford, OX1 3PS, United Kingdom; Kenya Wildlife Services, P.O. Box 40241, Nairobi, 00100, Kenya; Department of Biology, University of Utah, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	Uno K.T.,Fisher D.C.,Schuster G.,et al. High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate; ecology; and diet in ancient proboscideans[J],2020,559.
APA	Uno K.T..,Fisher D.C..,Schuster G..,Wittemyer G..,Douglas-Hamilton I..,...&Cerling T.E..(2020).High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate; ecology; and diet in ancient proboscideans.Palaeogeography, Palaeoclimatology, Palaeoecology,559.
MLA	Uno K.T.,et al."High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate; ecology; and diet in ancient proboscideans".Palaeogeography, Palaeoclimatology, Palaeoecology 559(2020).