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Poster (Scientific congresses and symposiums)
Environmental Controls on the Distribution of Aquatic Macrophytes in Ugandan Crater-lakes
Lebrun, Julie; Mahy, Grégory
2009La botanique africaine à Bruxelles. Symposium 27 mars 2009
 

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Abstract :
[en] This research is part of an integrated paleoecological project which aims at coupling reconstructions of past vegetation and water-quality changes with climate variability. Crater-lakes from East Africa are favourable to the conservation of proxy indicators such as plant macrofossils used to reconstruct the lake ecosystem. The study of modern macrophytic communities related to present environmental parameters was the first step of this research. Phytosociologic and environmental data were collected in 36 crater-lakes in South-western Uganda. Species abundance and habitat conditions were described in 216 relevés arranged along transects from the lakeshore to the depth limit of aquatic plant development. A cluster analysis identified 8 macrophytes communities and their indicator species were highlighted. Combining two levels of analysis (lake or relevé) with different kind of ordinations (CA and CCA), main parameters explaining community variability were conductivity, pH, Human Impact index, vegetation zonation and productivity (Chlorophyll-a and total nitrogen). Multiple species response curves to environmental parameters were performed to assess the ecological amplitude at the individual level and select species with a good proxy-indicator value. These results give some trends about the ecology of macrophytes communities and the ecological significations of macrofossils.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Lebrun, Julie ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Mahy, Grégory ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Environmental Controls on the Distribution of Aquatic Macrophytes in Ugandan Crater-lakes
Publication date :
27 March 2009
Number of pages :
A0
Event name :
La botanique africaine à Bruxelles. Symposium 27 mars 2009
Event organizer :
Université Libre de Bruxelles - Vrij Universiteit Brussels
Event place :
Bruxelles, Belgium
Event date :
27 mars 2007
Name of the research project :
CLANIMAE: CLimatic and ANthropic IMpacts on African Ecosystems
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Available on ORBi :
since 15 October 2009

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