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|Title:||Spatio-temporal dynamics of phytoplankton and primary production in Lake Tanganyika using a MODIS based bio-optical time series||Authors:||Bergamino, N
Loiselle, Steven Arthur
P. D., Plisnier
J. P., Descy
|Keywords:||remote sensing; Lake Tanganyika; primary production; chlorophyll absorbance||Issue Date:||2010||Project:||None||Journal:||REMOTE SENSING OF ENVIRONMENT||Abstract:||
Lake Tanganyika, the second largest freshwater ecosystem in Africa, is characterised by a significantheterogeneity in phytoplankton concentration linked to its particular hydrodynamics. To gather a properunderstanding of primary production, it is necessary to consider spatial and temporal dynamics throughoutthe lake. In the present work, daily MODIS-AQUA satellite measurements were used to estimate chlorophyll-aconcentrations and the diffuse attenuation coefficient (K490) for surface waters. The spatial regionalisation ofLake Tanganyika, based on Empirical Orthogonal Functions of the chlorophyll-a dataset (July 2002–November2005), allowed for the separation of the lake in 11 spatially coherent and co-varying regions, with 2 delocalisedcoastal regions. Temporal patterns of chlorophyll-a showed significant differences between regions.Estimation of the daily primary production in each region indicates that the dry season is more productivethan the wet season in all regions with few exceptions. Whole-lake daily primary productivity calculated on anannual basis (2003) was 646±142mgC m.2 day.1. Comparing our estimation to previous studies,photosynthetic production in Lake Tanganyika appears to be presently lower (about 15%), which is consistentwith other studies which used phytoplankton biovolume and changes of ä13C in the lake sediments. Thedecrease in lake productivity in recent decades may be associated to changes in climate conditions.
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