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This report describes details of a joint National Geographic Society-U.S. Geological Survey sponsored research expedition to Lake Tanganyika, Tanzania. The scientific focus of the research was to examine specific biogeochemical links between increased population pressure and biodiversity changes in the lake. Porewater, sediment and water column analyses are being interpreted to examine the effect of anthropogenic signatures, and these results are being prepared for publication in peer-reviewed scientific manuscripts. 1.1 Overall Operations In July of 1999, a research cruise directed by the US Geological Survey under contract to the National Geographic Society investigated the effects of heightened population pressure on the water quality of select rivers entering Lake Tanganyika, Tanzania (Swarzenski, 1999). The scientific research goal of the cruise was to compare/contrast the delivery of contaminants to Lake Tanganyika from select impacted and non-impacted rivers. Environmental 'impact' was defined for this project as any adverse effect on the natural health of Lake Tanganyika and included both inorganic and organic pollutants as well as physical alterations of the terrain due to agricultural practices. Such impact has an obvious and real effect on the local populations that must rely directly on the lake and the surrounding lakeshore for sustenance. To achieve the objectives defined in the original proposal, sediment cores were collected from contrasting river deltas and river channels. Pore waters were routinely extracted from the sediments to examine diagenetic signatures indicative of impact. Whole sediment cores were sectioned to examine historic contaminant inventories. Water column samples at an offshore site were collected to examine contaminant transport processes and scavenging rates. 1.2 Cruise Participants Dr. Peter Swarzenski, US Geological Survey, St Petersburg, FL; inorganic geochemist Dr. Bill Orem US Geological Survey, Reston, VA; organic geochemist Dr. James Krest Uni. of S. Carolina, Columbia, SC; radiochemist Ms. Greta Klungness Uni. of S. Florida, St. Petersburg, FL; spectrophoto. chemist Dr. Hudson Nkatago Uni. of Dar es Salaam, Tanzania; isotope geochemist This project was designed from its inception to be tightly interwoven with Dr. Andrew Cohen's multi-year, NSF-funded Research Experience for Undergraduates (REU) project. Through this collaboration, our own project's resources both in terms of added personnel and logistics were greatly extended beyond the project's scope. Andrew Cohen and his entire REU staff (including Catherine O'Reilly, Uni. of Arizona) were all invaluable in assuring the success

u.s. geological survey open file report/open-file report

A cruise report of the Joint National Geographic Society U.S. Geological Survey Lake Tanganyika, River-Lake interactions expedition, July 8-27, 1999 in Tanzania