Arid
DOI10.1016/j.palaeo.2007.01.002
Late Holocene environmental change in the northwestern Namib Desert margin: New fossil pollen evidence from hyrax middens
Gil-Romera, Graciela; Scott, Louis; Marais, Eugene; Brook, George A.
通讯作者Gil-Romera, Graciela
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2007
卷号249期号:1-2页码:1-17
英文摘要

The lack of anoxic environments in arid lands makes well-preserved fossil pollen difficult to find. The scarcity of continental palaeobotanical data in tropical and zones restricts the understanding of aridification processes in these endangered ecosystems. It is essential to improve the knowledge about their environmental histories during the Holocene, and therefore we attempt to investigate the causes and describe the patterns of vegetation change in northern Namibia. With that aim we analyzed pollen from fossil hyrax dung that accumulated over long periods of time by sampling strati graphically coherent sequences in five radio-carbondated middens. The fossil hyrax middens were found in rock shelters on the eastern desert edge in the northwestern Kaokoveld, within the so-called Nama-Karoo biome. This is an ecotonal area between the Namib Desert and the Savanna biomes which reflects features from both systems and its life form composition largely depends on an erratic rainfall pattern. Thirty-three samples were analyzed for pollen and the pollen record reflects a non-continuous vegetation history over the last 5200 yr with a hiatus between ca. 4200 and 1690 yr BP. The pollen spectra reflect arid savanna vegetation with a marked increase in the tree/grass ratio from ca. 1300 cat yr BP. The most likely cause for this change is a decline in moisture that we relate to intrinsic savanna dynamics, with early pastoralism, megahervibore migration and changes in the hyrax diet playing a minor role. (c) 2007 Elsevier B.V All rights reserved.


英文关键词Namib Desert Holocene palynology savanna dynamics Nama-Karoo vegetation history hyrax middens
类型Article
语种英语
国家Spain ; South Africa ; Namibia ; USA
收录类别SCI-E
WOS记录号WOS:000247326700001
WOS关键词SEA-SURFACE TEMPERATURES ; HOANIB RIVER CATCHMENT ; SOUTHWESTERN AFRICA ; SOUTHERN-AFRICA ; CLIMATIC-CHANGE ; PALEOCLIMATIC EVIDENCE ; RAINFALL VARIABILITY ; NORTHERN NAMIBIA ; EXISTING MODELS ; SW AFRICA
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/155601
作者单位(1)Univ Autonoma Madrid, Dept Biol Bot, E-28049 Madrid, Spain;(2)Univ Free State, Dept Plant Sci, ZA-9300 Bloemfontein, South Africa;(3)Natl Museum Namibia, Windhoek, Namibia;(4)Univ Georgia, Dept Geog, Athens, GA 30602 USA
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Gil-Romera, Graciela,Scott, Louis,Marais, Eugene,et al. Late Holocene environmental change in the northwestern Namib Desert margin: New fossil pollen evidence from hyrax middens[J],2007,249(1-2):1-17.
APA Gil-Romera, Graciela,Scott, Louis,Marais, Eugene,&Brook, George A..(2007).Late Holocene environmental change in the northwestern Namib Desert margin: New fossil pollen evidence from hyrax middens.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,249(1-2),1-17.
MLA Gil-Romera, Graciela,et al."Late Holocene environmental change in the northwestern Namib Desert margin: New fossil pollen evidence from hyrax middens".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 249.1-2(2007):1-17.
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