activities. This reservoir, surrounded by urban development, receives wastewater from many sources, examples being animal farming, urban and agricultural runoff, and sewage loading. This results in significant changes in the trophic state of the reservoir. Such changes are thought to influence the algae community, although these changes may not be consistent throughout algae taxonomic groups (Piehler et al., 2004).Euglenophyceae are very tolerant to pollution, quickly responding to changes in the organic pollution level (John et al., 2004). In most studies, organic matter is more important in a wide variety of Euglenophyceae growth (Kim & Boo, 2001;Wołowski & Hindák, 2005).There is little information on Euglenophyceae communities in Côte d'Ivoire surface waters. The known works were by Bourrelly (1961), Uherkovich andRai (1977), andOuattara et al. (2000).The main purpose of this study was to provide a taxonomic and floristic account, and to try to understand the species richness of the Adzopé Reservoir Euglenozoa. This study, based on the qualitative analysis of samples, is also a first taxonomic inventory of the Euglenozoa community occurring in the Adzopé Reservoir. Materials and methods Description of study areaThe reservoir, as shown in Figure 1, located at 6°06′N and 3°51′E, lies in an urban area of the city of Adzopé, in the south-east of Côte d'Ivoire that belongs to the subequatorial zone (Iltis & Lévêque, 1982). It has a surface area of 61.44 ha. The reservoir has a maximum depth of 7 m and a length of about 2 km. It has no permanent inflowing streams, but there is an overflow channel at its southern end. The sources of water inputs are seasonal, usually being direct precipitation in the form of rainfall.The area has 4 seasons as shown in Figure 2: the long dry season (December-February), the long rainy season (March-July); the short dry season (August), and the short rainy season (September-November). The reservoir was built in 1977 for water supplementation. Two sampling stations (St1 and St2) were sampled according to the longitudinal gradient as shown in Figure 1. Physicochemical parametersSome physicochemical measurements were made in the field immediately after each sample was collected. The Conductimeter Aqualitic CD24 was used to assess water temperature and conductivity. Dissolved oxygen was measured with the Oxymeter Aqualitic OX24, and pH with the pHmeter Aqualitic, pH24. For nutrients (orthophosphates and nitrates), subsamples of 30 mL were Abstract: The Euglenozoa flora of the Adzopé Reservoir in Côte d'Ivoire was investigated from January to December 2005. The species composition of the assemblage was compiled, accompanied by illustrations. Forty-four taxa were identified in the temporal survey. Ten taxa (22.22%) are new for Côte d'Ivoire. The taxonomic structure presents 22.32% of the species common to the freshwater of West Africa, with most of the taxa (89.5%) found to be cosmopolitan. An endemic taxon, Trachelomonas pisciformis var. bicoronata Couté & Iltis (Euglenaceae), was observed. ...
La dynamique spatio-saisonnière des micro-algues de réservoir d’Adzopé a été analysée à partir d’échantillons collectés mensuellement de janvier à décembre 2005. Un total de 186 taxons de rang spécifique et infra spécifique a été identifié. Au niveau spatial, les densités les plus élevées sont enregistrées en aval alors que les densités les plus faibles le sont en amont. Au niveau saisonnier, en général, les densités micro-algales sont maximales lors de la grande saison sèche et de la petite saison pluvieuse en relation avec les fortes concentrations en nitrates et orthophosphates. Lors de ces périodes, des taxons comme Geitleribactron periphyticum, Microcystis aeruginosa, Microcystis wesenbergii, Trachelomonas volvocina, Trachelomonas volvocinopsis, Cosmarium granatum, Cosmarium quadratulum var. aplanatum, Cosmarium trilobulatum, Desmodesmus quadricaudata, Pseudulvella americana et Encyonema silesiacum contribuent fortement à l’élévation de densité. Les valeurs de l’indice de diversité de Shannon (H’) et l’Équitabilité (E) varient entre 0,82 à St1 à 3,3 à la station St3 pendant la grande saison sèche et entre 0,25 à la station St1 à 0,83 à la station St3 pendant la grande saison sèche, respectivement. English title: Spatio-seasonal distribution of micro-algae in Adzopé reservoir (Côte d’Ivoire)Spatio-seasonal dynamics of micro-algae from the raw potable water reservoir of Adzopé, was investigated in this study. The samples were collected monthly from January to December 2005. One hundred eighty six taxa of micro-algae were identified in the temporal survey. At spatial level, micro-algae abundances showed high values downstream and low values in the upstream. At the seasonal level, in general, micro-algae densities showed maximum values during the long dry season and the short rainy season corresponding to high concentrations of nitrates and orthophosphates. In generally, abundance was dominated by taxa like Geitleribactron periphyticum, Microcystis aeruginosa, Trachelomonas volvocina, Trachelomonas volvocinopsis, Cosmarium granatum, Cosmarium trilobulatum, Desmodesmus quadricaudata, Pseudulvella americana and Encyonema silesiacum. Values of diversity (H’) and evenness (E) indexes varied between 0.82 at St1 to 3.3 at St3 during long dry seasons and 0.25 at St1 to 0.83 at St3 during long dry season, respectively.
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