globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.03.020
论文题名:
Late Pleistocene-Holocene environmental conditions in Lanzarote (Canary Islands) inferred from calcitic and aragonitic land snail shells and bird bones
作者: Yanes Y.; García-Alix A.; Asta M.P.; Ibáñez M.; Alonso M.R.; Delgado A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 378
起始页码: 91
结束页码: 102
语种: 英语
英文关键词: Extinctions ; Land snails ; Lanzarote ; Quaternary ; Seabirds ; Stable isotopes
英文摘要: Aragonitic and calcitic land snails from carbonate-rich paleosols in northwestern Lanzarote (Canary Islands) were analyzed for 13C/12C and 18O/16O ratios to deduce the Pleistocene-Holocene transition in the westernmost Sahara zone. Modern, mid-late Holocene (~2.1-5.5calka BP) and late Pleistocene (~23.3-24.0calka BP) aragonitic shells exhibited respective values of -9.5±1.6‰, -7.7±1.5‰, and -2.3±2.8‰ for δ13C; and +0.3±0.3‰, +0.1±0.7‰, and +2.5±0.4‰ for δ18O. Holocene and Pleistocene calcitic shells of the endemic slug Cryptella canariensis showed respective values of -0.7±2.6‰ and -8.5±2.5‰ for δ13C; and +0.8±1.5 and +3.6±0.4‰ for δ18O. Both aragonitic and calcitic shells showed equivalent temporal isotopic trends. Higher δ13C values during ~23.3-24.0calka BP suggest higher abundance of C4 and/or CAM plants, likely associated with drier conditions and/or lower atmospheric CO2 concentration. Maximum shell δ18O values during ~23.3-24.0calka BP opposes minimal values of Greenland ice cores and probably reflect the combined effects of (1) higher rain δ18O values linked to higher glacial seawater δ18O values and/or larger snail activity during summer seasons; (2) relative humidity values similar or slightly lower than at present; (3) higher evaporation rates; and (4) cooler temperatures. Bone remains of the extinct Dune Shearwater Puffinus holeae were only recovered from the Holocene bed. Collagen δ13C and δ15N values (-13.5±0.2‰[PDB] and +13.7±1.0‰[air], respectively) match with the signature of a low trophic level Macaronesian seabird that fed upon local fish. Bone carbonate δ13C (-7.4±1.0‰[PDB]) and phosphate δ18O (+18.2±0.4‰[SMOW]) values exhibited pristine signals denoting their potential value in future paleoenvironmental studies in the region. The age of P. holeae (~2.1-2.7calka BP) supports that the aboriginal population possibly caused its extinction. In contrast, the extinction of the endemic helicid Theba sp. (~23.3-24.0calka BP) was likely caused by environmental change. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69739
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Avenida de Las Palmeras 4, Armilla 18100, Granada, Spain; Departamento de Didáctica de las Ciencias Sociales y Experimentales, Universidad de Córdoba, Avda. San Alberto Magno, s/n, 14004-Córdoba, Spain; Departamento de Biologia Animal, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Islas Canarias, Spain

Recommended Citation:
Yanes Y.,García-Alix A.,Asta M.P.,et al. Late Pleistocene-Holocene environmental conditions in Lanzarote (Canary Islands) inferred from calcitic and aragonitic land snail shells and bird bones[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,378
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