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    Spatio-temporal dynamics of phytoplankton and primary production in Lake Tanganyika using a MODIS based bio-optical time series

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    Authors
    Bergamino, N.
    Horion, S.
    Stenuite, S.
    Cornet, Y.
    Loiselle, SA.
    Plisnier , P-D.
    Descy, J-P.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Surface environments and collection management
    Audience
    Scientific
    Date
    2010
    Publisher
    Elsevier
    Metadata
    Show full item record
    Description
    Lake Tanganyika, the second largest freshwater ecosystem in Africa, is characterised by a significant
    heterogeneity in phytoplankton concentration linked to its particular hydrodynamics. To gather a proper
    understanding of primary production, it is necessary to consider spatial and temporal dynamics throughout
    the lake. In the present work, daily MODIS-AQUA satellite measurements were used to estimate chlorophyll-a
    concentrations and the diffuse attenuation coefficient (K490) for surface waters. The spatial regionalisation of
    Lake Tanganyika, based on Empirical Orthogonal Functions of the chlorophyll-a dataset (July 2002 November
    2005), allowed for the separation of the lake in 11 spatially coherent and co-varying regions, with 2 delocalised
    coastal 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 productive
    than the wet season in all regions with few exceptions. Whole-lake daily primary productivity calculated on an
    annual 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 consistent
    with other studies which used phytoplankton biovolume and changes of δ13C in the lake sediments. The
    decrease in lake productivity in recent decades may be associated to changes in climate conditions.
    Citation
    Bergamino, N.; Horion, S.; Stenuite, S.; Cornet, Y.; Loiselle, SA.; Plisnier , P-D.; Descy, J-P. (2010). Spatio-temporal dynamics of phytoplankton and primary production in Lake Tanganyika using a MODIS based bio-optical time series. , Remote Sensing of Environment, Vol. 114 (4), 772-780, Elsevier, DOI: :10.1016/j.rse.2009.11.013.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/798
    doi: http://dx.doi.org/:10.1016/j.rse.2009.11.013
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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