Arid
DOI10.1016/j.quaint.2017.06.054
Pollen in fossil hyrax dung from Marine Isotope Stages 2 and 3 reveals past environments in Namibia
Scott, Louis1; Romera, Graciela Gil2,3; Marais, Eugene4; Brook, George A.5
通讯作者Scott, Louis
来源期刊QUATERNARY INTERNATIONAL
ISSN1040-6182
EISSN1873-4553
出版年2018
卷号464页码:260-272
英文摘要

In view of a scarcity of terrestrial Quaternary pollen records relating to climate change in desert areas, we present new terrestrial sequences from hyrax middens in Namibia. While the few previously available pollen records are mainly Holocene, we present climate time series for Marine Isotope Stages 2 and 3 (MIS 2 and MIS 3). The data are from two sites in central Namibia that are surrounded by desert plains and close to the Namibian escarpment, viz., the Daures Massif (Brandberg) and 200 km further south, the Mirabib Shelter located in a small inselberg. In the studied material, grass-rich pollen assemblages were more common at Mirabib where the vegetation is desert grassland, than at Brandberg with its mountain vegetation. Hyrax radiocarbon ages range from 21 ka to > 50 ka, with inconsistencies in ages near the limit of effective radiocarbon dating. However, correlation of overlapping sequences supports the chronology we present. Despite chronological gaps in the available deposits, pollen assemblages from different middens indicate marked climate cycles, starting with moderately cool dry conditions with grassy karroid vegetation at Mirabib c. 50 ka. After a gap in the record, warmer conditions with savanna woodland are indicated at both Mirabib and Brandberg around 40 ka. Eventually, cool conditions supporting shrubby grassland with wild olives developed at Brandberg during MIS 2, c. 21 ka. Comparison with marine pollen data confirms earlier findings that terrestrial pollen assemblages differ markedly from South Atlantic Ocean marine pollen assemblages of the same age presumably due to mixing of pollen from wide source areas at the marine localities versus the more locally restricted terrestrial pollen sources trapped in hyrax dung. The results therefore add information for the interpretation of local vegetation shifts on land during the interval between 50 ka and 21 ka in Namibia. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.


英文关键词Namib Desert Pollen Faecal deposits Palaeoecology Vegetation change
类型Article
语种英语
国家South Africa ; Wales ; Spain ; Namibia ; USA
收录类别SCI-E
WOS记录号WOS:000425233900019
WOS关键词FECAL DEPOSITS HYRACEUM ; CLIMATE-CHANGE ; SOUTHWESTERN AFRICA ; LATE PLEISTOCENE ; SOUTH-AFRICA ; HOLOCENE VEGETATION ; RECORD ; ATLANTIC ; MIDDENS ; DESERT
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212429
作者单位1.Univ Free State, Dept Plant Sci, ZA-9300 Bloemfontein, South Africa;
2.Aberystwyth Univ, Dept Geog & Earth Sci, Penglais Campus, Aberystwyth SY23 3DB, Dyfed, Wales;
3.CSIC, Pyrenean Inst Ecol, Avda Montanana 1005, Zaragoza 50159, Spain;
4.Natl Museum Namibia, POB 1203, Windhoek, Namibia;
5.Univ Georgia, Dept Geog, Athens, GA 30602 USA
推荐引用方式
GB/T 7714
Scott, Louis,Romera, Graciela Gil,Marais, Eugene,et al. Pollen in fossil hyrax dung from Marine Isotope Stages 2 and 3 reveals past environments in Namibia[J],2018,464:260-272.
APA Scott, Louis,Romera, Graciela Gil,Marais, Eugene,&Brook, George A..(2018).Pollen in fossil hyrax dung from Marine Isotope Stages 2 and 3 reveals past environments in Namibia.QUATERNARY INTERNATIONAL,464,260-272.
MLA Scott, Louis,et al."Pollen in fossil hyrax dung from Marine Isotope Stages 2 and 3 reveals past environments in Namibia".QUATERNARY INTERNATIONAL 464(2018):260-272.
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