Enhanced middle Holocene organic carbon burial in tropical floodplain lakes of the Pantanal (South America)
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ORIGINAL PAPER
Enhanced middle Holocene organic carbon burial in tropical floodplain lakes of the Pantanal (South America) Giliane G. Rasbold . Michael M. McGlue . Jose´ C. Stevaux . Mauro Parolin . Aguinaldo Silva . Ivan Bergier
Received: 5 March 2020 / Accepted: 29 September 2020 Ó Springer Nature B.V. 2020
Abstract Wetland carbon storage is an important and environmentally sensitive ecosystem service. Carbon burial in the floodplain lakes of the Pantanal (tropical South America) appears to have varied during the late Quaternary, but several paleolimnological studies have recorded unusually high sediment organic carbon content from * 7.3 to 6.0 cal kyr BP in lakes connected to the Upper Paraguay River. We conducted a multi-indicator (phytoliths, sponge spicules, and geochemistry) study of a sediment core from Lake Ca´ceres (Bolivia), and found evidence for enhanced organic carbon burial during the middle
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10933-020-00159-5) contains supplementary material, which is available to authorized users. G. G. Rasbold (&) J. C. Stevaux Graduate Program in Ecology of Inland Water Ecosystems, State University of Maringa´, Av. Colombo, 5790, Room 9, Block G-90, Maringa´, Parana´ 87.020-900, Brazil e-mail: [email protected] M. M. McGlue Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY, USA J. C. Stevaux Graduate Program in Geography, Federal University of Mato Grosso Do Sul, Treˆs Lagoas, Mato Grosso Do Sul, Brazil
Holocene that provides insights into the flooding history of the Upper Paraguay River. d13Corg and C/N data suggest that organic matter deposited at that time in Lake Ca´ceres was from macrophytes. Similar datasets from three other floodplain lakes are consistent with this finding. We suggest that enhanced carbon burial occurred when lake levels declined under relatively dry climate conditions, which increased the littoral area at the expense of open water and captured floating macrophyte islands. This study sheds new light on hydroclimate controls on carbon cycling in the Pantanal wetlands, and improves interpretations of geochemical measures on bulk organic matter in floodplain lake cores. Keywords Biological indicators Lake sediments Ecosystem services Paleolimnology Wetlands M. Parolin Laboratory of Paleoenvironmental Studies, State University of Parana´, Campo Moura˜o, Parana´, Brazil A. Silva Department of Geography, Federal University of Mato Grosso Do Sul-CPAN, Corumba´, Mato Grosso Do Sul, Brazil I. Bergier Embrapa Pantanal, Corumba´, Mato Grosso Do Sul, Brazil
123
J Paleolimnol
Introduction Tropical wetlands are diverse landscapes of considerable ecological importance (Neue et al. 1997; Einsele et al. 2001; Junk et al. 2013). Tropical wetlands perform many ecosystem services, harbor exceptional biodiversity, and are critical for regional primary productivity and nutrient cycling, particularly in environments in
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