globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.09.007
论文题名:
Quaternary ostracodes and molluscs from the Rukwa Basin (Tanzania) and their evolutionary and paleobiogeographic implications
作者: Cohen A.S.; Van Bocxlaer B.; Todd J.A.; McGlue M.; Michel E.; Nkotagu H.H.; Grove A.T.; Delvaux D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392
起始页码: 79
结束页码: 97
语种: 英语
英文关键词: Freshwater biogeography ; Lake Rukwa ; Lake Tanganyika ; Mollusc ; Ostracode ; Paleolimnology
英文摘要: Much of the spectacular biodiversity of the African Great Lakes is endemic to single lake basins so that the margins of these basins or their lakes coincide with biogeographic boundaries. Longstanding debate surrounds the evolution of these endemic species, the stability of bioprovinces, and the exchange of faunas between them over geologic time as the rift developed. Because these debates are currently unsettled, we are uncertain of how much existing distribution patterns are determined by modern hydrological barriers versus reflecting past history. This study reports on late Quaternary fossils from the Rukwa Basin and integrates geological and paleoecological data to explore faunal exchange between freshwater bioprovinces, in particular with Lake Tanganyika. Lake Rukwa's water level showed large fluctuations over the last 25. ky, and for most of this period the lake contained large habitat diversity, with different species assemblages and taphonomic controls along its northern and southern shores. Comparison of fossil and modern invertebrate assemblages suggests faunal persistence through the Last Glacial Maximum, but with an extirpation event that occurred in the last 5. ky. Some of the molluscs and ostracodes studied here are closely related to taxa (or part of clades) that are currently endemic to Lake Tanganyika, but others testify to wider and perhaps older faunal exchanges between the Rukwa bioprovince and those of Lake Malawi and the Upper Congo (in particular Lake Mweru). The Rukwa Basin has a long history of rifting and lacustrine conditions and, at least temporarily, its ecosystems appear to have functioned as satellites to Lake Tanganyika in which intralacustrine speciation occurred. Paleontological studies of the Rukwa faunas are particularly relevant because of the basin's important role in the late Cenozoic biogeography of tropical Africa, and because many of the molecular traces potentially revealing this history would have been erased in the late Holocene extirpation.© 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/69564
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States; Departments of Paleobiology and Invertebrate Zoology, National Museum of Natural History, Washington, D.C. 20013, United States; Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Energy Resources Program, U.S. Geological Survey, Denver CO, United States; Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Department of Geology, University of Dar es Salaam, P.O. Box 35052, Dar es Salaam, Tanzania; Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, United Kingdom; Geodynamics and Mineral Resources Unit, Royal Museum for Central Africa, B-3080 Tervuren, Belgium; School of Geosciences, University of Witwatersrand, Johannesburg 2050, South Africa

Recommended Citation:
Cohen A.S.,Van Bocxlaer B.,Todd J.A.,et al. Quaternary ostracodes and molluscs from the Rukwa Basin (Tanzania) and their evolutionary and paleobiogeographic implications[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392
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