Spatio-temporal dynamics of phytoplankton and primary production in Lake Tanganyika using a MODIS based bio-optical time series
| dc.contributor.author | Bergamino, N. | |
| dc.contributor.author | Horion, S. | |
| dc.contributor.author | Stenuite, S. | |
| dc.contributor.author | Cornet, Y. | |
| dc.contributor.author | Loiselle, SA. | |
| dc.contributor.author | Plisnier , P-D. | |
| dc.contributor.author | Descy, J-P. | |
| dc.date | 2010 | |
| dc.date.accessioned | 2016-03-15T10:03:47Z | |
| dc.date.available | 2016-03-15T10:03:47Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/798 | |
| dc.description | Lake Tanganyika, the second largest freshwater ecosystem in Africa, is characterised by a significant<br>heterogeneity in phytoplankton concentration linked to its particular hydrodynamics. To gather a proper<br>understanding of primary production, it is necessary to consider spatial and temporal dynamics throughout<br>the lake. In the present work, daily MODIS-AQUA satellite measurements were used to estimate chlorophyll-a<br>concentrations and the diffuse attenuation coefficient (K490) for surface waters. The spatial regionalisation of<br>Lake Tanganyika, based on Empirical Orthogonal Functions of the chlorophyll-a dataset (July 2002 November<br>2005), allowed for the separation of the lake in 11 spatially coherent and co-varying regions, with 2 delocalised<br>coastal regions. Temporal patterns of chlorophyll-a showed significant differences between regions.<br>Estimation of the daily primary production in each region indicates that the dry season is more productive<br>than the wet season in all regions with few exceptions. Whole-lake daily primary productivity calculated on an<br>annual basis (2003) was 646±142mgC m−2 day−1. Comparing our estimation to previous studies,<br>photosynthetic production in Lake Tanganyika appears to be presently lower (about 15%), which is consistent<br>with other studies which used phytoplankton biovolume and changes of δ13C in the lake sediments. The<br>decrease in lake productivity in recent decades may be associated to changes in climate conditions. | |
| dc.language | eng | |
| dc.publisher | Elsevier | |
| dc.title | Spatio-temporal dynamics of phytoplankton and primary production in Lake Tanganyika using a MODIS based bio-optical time series | |
| dc.type | Article | |
| dc.subject.frascati | Earth and related Environmental sciences | |
| dc.audience | Scientific | |
| dc.subject.free | Surface environments and collection management | |
| dc.source.title | Remote Sensing of Environment | |
| dc.source.volume | 114 (4) | |
| dc.source.page | 772-780 | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.doi | :10.1016/j.rse.2009.11.013 | |
| dc.identifier.rmca | 621 |
