noaa-lake-24631 Lake Malawi 1.2 Million Year Ostracod and Geochemical Lake Level Data Ivory, S.J.; Blome, M.W.; King, J.W.; McGlue, M.M.; Cole, J.E.; Cohen, A.S. Lake Malawi 1.2 Million Year Ostracod and Geochemical Lake Level Data 2018-07-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24631 Investigator S.J. Ivory Investigator M.W. Blome Investigator J.W. King Investigator M.M. McGlue Investigator J.E. Cole Investigator A.S. Cohen earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,broken ostracod valves earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,carbonate coated ostracode valves earth science paleoclimate paleolimnology identified chlorophyte,sediment,null,count per gram,null,paleolimnology,log-transformed,microscopy,N,botryococcus earth science paleoclimate paleolimnology quartz,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,null earth science paleoclimate paleolimnology siderite,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,null earth science paleoclimate paleolimnology total ostracods,sediment,null,count per gram,null,paleolimnology,log-transformed,microscopy,N,null earth science paleoclimate paleolimnology lake level,null,null,dimensionless,null,paleolimnology,null,microscopy,N,reconstruction based on PCA of above fossils; low values are high lake levels earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Candonopsis earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,whole ostracod valves earth science paleoclimate paleolimnology charcoal,sediment,null,count per gram,null,paleolimnology,log-transformed,microscopy,N,null earth science paleoclimate paleolimnology pyrite,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,null earth science paleoclimate paleolimnology vivianite,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,null earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,adult ostracods earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Cypridopsines earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Ilyocypris earth science paleoclimate paleolimnology depth,null,null,meter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology fish index,sediment,null,count per gram,null,paleolimnology,log-transformed,microscopy,N,fish bones earth science paleoclimate paleolimnology identified midge,sediment,null,count per gram,null,paleolimnology,log-transformed,microscopy,N,chaobrids earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Sclerocypris earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Gomphocythere earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,oxidation stained ostracode valves earth science paleoclimate paleolimnology ostracod index,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,reduction stained ostracode valves earth science paleoclimate paleolimnology mica group,sediment,null,count per gram,null,paleolimnology,null,microscopy,N,null earth science paleoclimate paleolimnology age,null,null,calendar kiloyear before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology identified ostracod,null,null,count per gram,null,paleolimnology,null,microscopy,N,Limnocythere earth science paleoclimate paleolimnology population abundance earth science paleoclimate paleolimnology mineralogy geoscientificInformation Other Hydroclimate Reconstruction 1219118 cal yr BP 10475 cal yr BP Complete -11.29389 -11.29389 34.43722 34.43722 500 500 Continent Africa Eastern Africa Malawi Lake Malawi, core GLAD7-MAL05-1>LATITUDE -11.29389>LONGITUDE 34.43722 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Sarah J. Ivory, Margaret W. Blome, John W. King, Michael M. McGlue, Julia E. Cole, and Andrew S. Cohen 2016 Proceedings of the National Academy of Sciences 113 42 11895-11900 10.1073/pnas.1611028113 http://www.pnas.org/content/113/42/11895

Long paleoecological records are critical for understanding evolutionary responses to environmental forcing and unparalleled tools for elucidating the mechanisms that lead to the development of regions of high biodiversity. We use a 1.2-My record from Lake Malawi, a textbook example of biological diversification, to document how climate and tectonics have driven ecosystem and evolutionary dynamics. Before ~800 ka, Lake Malawi was much shallower than today, with higher frequency but much lower amplitude water-level and oxygenation changes. Since ~800 ka, the lake has experienced much larger environmental fluctuations, best explained by a punctuated, tectonically driven rise in its outlet location and level. Following the reorganization of the basin, a change in the pacing of hydroclimate variability associated with the Mid-Pleistocene Transition resulted in hydrologic change dominated by precession rather than the high-latitude teleconnections recorded elsewhere. During this time, extended, deep lake phases have abruptly alternated with times of extreme aridity and ecosystem variability. Repeated crossings of hydroclimatic thresholds within the lake system were critical for establishing the rhythm of diversification, hybridization, and extinction that dominate the modern system. The chronology of these changes closely matches both the timing and pattern of phylogenetic history inferred independently for the lake's extraordinary array of cichlid fish species, suggesting a direct link between environmental and evolutionary dynamics. STUDY NOTES: Ostracod assemblage and sediment mineralogy data with lake level reconstruction for Lake Malawi, for the past 1.2 million years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/eastafrica/malawi2016ost.txt NOAA Template File; Lake Malawi Ostracod and Geochemical Lake Level Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11