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Les diatomées (Bacillariophyta) et autres algues des sources thermales du Burundi (Afrique centrale) en relation avec les caractéristiques physiques et chimiques des eaux Les diatomées (Bacillariophyta) et autres algues des sources thermales du Burundi (Afrique centrale) en relation avec les caractéristiques physiques et chimiques des eaux

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Abstract:

. — We studied the physical and chemical characteristics and algal composition of 13 hot springs of Burundi, Central Africa, situated between 773 and 2550 m above sea level. The waters studied mostly belong to the bicarbonate type, some hot springs being rich in chlorides ; their temperature varied between 29 °C and 57.5 °C. In total 92 taxa of algae belonging to the Cyanobacteria, Chlorophyta and Bacillariophyta have been identified from 13 samples and the diatoms comprised 80 taxa. The species recorded from the hot springs are not different from those observed from other water bodies of Burundi ; they are considered as thermo-tolerant species. A canonical correspondence analysis based on the diatom species, physical and chemical variables separated the hot springs with low mineralisation from the springs with high mineralisation and showed that the conductivity, bicarbonates and chlorides seem to be more important in their separation.

French
La recherche a porté sur les propriétés physique et chimique et la composition algale de 13 sources thermales situées au Burundi, en Afrique centrale, entre les altitudes 773 et 2550 m. Les eaux de ces sources sont principalement de type bicarbonaté, certaines sources étant très riches en chlorures ; leur température varie de 29°C à 57.5°C. Au total, 92 taxons appartenant aux groupes des Cyanobacteria, Chlorophyta et Bacillariophyta ont été observés dans 13 échantillons, 80 taxons appartenant à ce dernier groupe. Les espèces des sources thermales ne diffèrent pas de celles des autres eaux du Burundi déjà étudiées et peuvent être considérées comme des espèces thermo-tolérantes. Une analyse canonique des correspondances appliquée aux espèces de diatomées ainsi qu'aux variables physiques et chimiques a permis de repérer les taxons associés aux sources thermales faiblement minéralisées et ceux associés aux sources fortement minéralisées et indique que leur séparation est principalement due à la conductivité, aux bicarbonates et aux chlorures.

Keywords: AFRICA; BURUNDI; DIATOMS; THERMAL SPRINGS

Language: French

Document Type: Regular Paper

Publication date: February 1, 2006

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  • The Belgian Journal of Botany (now known as Plant Ecology and Evolution) is an international journal open to all fields of plant sciences. Please note, however, that papers restricted to purely nomenclatural matters or to floristical data of only local interest will not be accepted. The Journal appears in one volume of two issues per year. It publishes reviews, original research papers, short notes, letters to the editor, and book reviews. Click here for current issues of this journal
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