@article{c4836a2e96d94e9fa6a151c0e98ae8c3,
title = "The sedimentary response to a rapid change in lake level in Lake Tanganyika",
abstract = "We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite.",
keywords = "Geochemistry, Lake Tanganyika, Little Ice Age, Transgression, δC, δN",
author = "James McManus and Silke Severmann and Cohen, {Andrew S.} and McKay, {Jennifer L.} and Montanye, {Bo R.} and Hartwell, {Anne M.} and Brucker, {Rebecca L.P.} and Robert Wheatcroft",
note = "Funding Information: This project benefited from the NSF -funded REU Nyanza Project (NSF-ATM 0223920 ), which was coincident with this project's field campaign. Without that infrastructure, this project could not have taken place. We would like to thank Catherine O'Reilly, Ellinor Michel, and Hudson Nkotagu for their support throughout the field component of this project, and in particular, we would like to thank Kiram Lezzar for his many heroic contributions to the success of the project. Multiple REU students provided enthusiastic assistance during our fieldwork. We would also like to thank the captain and crew of the M/V Maman Benita for their assistance. Margaret Sparrow, Anna Pakenham, Rhea Sanders, and Jeremy Owens all provided analytical support for this project. NSF grants 0518322 and 0551605 (to J.M.) and 0551716 (to S.S) provided primary funding for this work and support from the University of Akron (to JM) lead to the completion of this work. Comments from Joe Werne's research group, and in particular Molly O'Beirne inspired a more in-depth investigation into the stable isotope records and are sincerely appreciated. Piet Verburg, Bob Hecky, and an anonymous reviewer provided insightful comments, which improved and focused the final version of this manuscript; their time and effort are sincerely appreciated. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",
year = "2015",
month = dec,
day = "15",
doi = "10.1016/j.palaeo.2015.09.035",
language = "English (US)",
volume = "440",
pages = "647--658",
journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
issn = "0031-0182",
publisher = "Elsevier",
}