DOI: 10.1016/j.quascirev.2013.08.021
Scopus记录号: 2-s2.0-84899938481
论文题名: New cetacean δR values for Arctic North America and their implications for marine-mammal-based palaeoenvironmental reconstructions
作者: Furze M.F.A. ; Pieńkowski A.J. ; Coulthard R.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 91 起始页码: 218
结束页码: 241
语种: 英语
英文关键词: Balaena mysticetus
; Bowhead whale
; Canadian Arctic
; Radiocarbon calibration
; Reservoir correction
; Sea ice
; δR
Scopus关键词: Bone
; Collagen
; Mammals
; Population statistics
; Sea ice
; Sea level
; Balaena mysticetus
; Bowhead whales
; Canadian Arctic
; Canadian Arctic Archipelago
; Delphinapterus leucas
; Palaeoenvironmental reconstruction
; Radiocarbon calibration
; Spatio-temporal fluctuations
; Repair
; Balaena mysticetus
; Balaenidae
; Cetacea
; Delphinapterus leucas
; Mammalia
; Odobenidae
; Odobenus rosmarus
英文摘要: Radiocarbon-dated marine mammal remains from emergent Arctic coastlines have frequently been used to reconstruct Holocene sea-ice histories. The use of such reconstructions has hitherto been complicated by uncertain marine reservoir corrections precluding meaningful intercomparisons with data reported in calibrated or sidereal years. Based on an exhaustive compilation of previously published marine mammal radiocarbon dates (both live-harvested materials and subfossils) from the Canadian Arctic Archipelago (CAA), new, statistically-derived δ13C and δR values are provided. Average δ13C values are:-16.1±1.1‰ (bone collagen; n=193) for bowhead (Balaena mysticetus);-14.4±0.5‰ (n=44; dentine) for beluga (Delphinapterus leucas);-14.8±1.9‰ (teeth and tusks; n=18) and-18.0±4.7‰ (n=9; bone collagen) for walrus (Odobenus rosmarus). δR values are 170±95 14C years for bowhead (n=23) and 240±60 14C years for beluga (n=12). Scarce data preclude calculation of meaningful, statistically robust walrus δR. Using the new δR values, an expanded and revised database of calibrated bowhead dates (651 dates; many used in previous CAA sea-ice reconstructions) shows pronounced late Quaternary spatio-temporal fluctuations in bone abundance. Though broadly resembling earlier bowhead subfossil frequency data, analysis of the new expanded database suggests early- and mid-Holocene increases in whale abundance to be of longer duration and lower amplitude than previously considered. A more even and persistent spread of infrequent low-abundance remains during "whale free" intervals is also seen. The dominance of three eastern regions (Prince Regent Inlet & Gulf of Boothia; Admiralty Inlet; Berlinguet Inlet/Bernier Bay) in the CAA data, collectively contributing up to 88% of all subfossil remains in the mid-Holocene, is notable. An analysis of calibrated regional sea-level index points suggests that severance of the Admiralty Inlet-Gulf of Boothia marine channel due to isostatically-driven regression may have played a significant role in enhanced whale mortality during this interval. Comparisons between the newly calibrated bowhead data and other regional sea-ice proxy data further highlight spatial and temporal discrepancies, potentially due to regional asynchronicities and variable sensitivities in proxy response to climate and oceanographic forcing. However, the limited number of deglacial-postglacial marine records continues to hamper extensive intercomparisons between marine mammal and other proxy datasets. Nevertheless, an examination of assumptions inherent in linking bowhead subfossil frequencies, population densities, and sea-ice thickness and distribution, shows that such relationships are highly complex. Factors such as broad sea-ice preferences, variable mortality rates and causes, long distance carcass transport, variable coastline and basin/channel geometries, and changing emergence rates all complicate the correlation of whale bone abundance to sea-ice histories. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60312
Appears in Collections: 过去全球变化的重建
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作者单位: Earth and Planetary Sciences Division, Department of Physical Sciences, MacEwan University, Edmonton, AB T5J 4S2, Canada; School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge, Anglesey, Wales LL59 5AB, United Kingdom; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
Recommended Citation:
Furze M.F.A.,Pieńkowski A.J.,Coulthard R.D.. New cetacean δR values for Arctic North America and their implications for marine-mammal-based palaeoenvironmental reconstructions[J]. Quaternary Science Reviews,2014-01-01,91