Biogenic productivity of Lake Tanganyika is highly dependent on seasonal upwellings of anoxic deep waters. We investigated the shell of freshwater bivalve Pleiodon spekii as a geochemical archive of these periodic hydrological changes tuned by the monsoon regime. The results of a 2-years-long geochemical survey of the coastal waters 5 performed on the dissolved and particulate fractions were put in perspective against laser ablation ICP-MS profiles of Mn in five aragonitic shells from the same lake location. Skeletal Mn profiles in 3 shells are very similar and dominated by episodic peaks that matched the Mn increase recorded in surface waters during the 2002 upwelling, while a shell collected during 2003 dry season detect both 2002 and 2003 upwelling 10 events. Larger shells showing an extremely reduced growth display more than 8 Mn peaks suggesting at least an 8 years record of seasonal changes in water composition .
CITATION STYLE
Langlet, D., Alleman, L. Y., Plisnier, P.-D., Hughes, H., André, L., & André, A. (2006). Mn seasonal upwellings recorded in Lake Tanganyika mussels. Biogeosciences Discussions (Vol. 3, pp. 1453–1471). Retrieved from www.biogeosciences-discuss.net/3/1453/2006/
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