Zooplankton Variability in 49 Shallow Tropical Reservoirs of Ivory Coast (West Africa)

Aka, Maryse; Pagano, Marc; Saint‐Jean, Lucien; Arfi, Robert; Bouvy, Marc; Cecchi, Philippe; Corbin, Daniel; Thomas, Serge

doi:10.1002/1522-2632(200008)85:4<491::aid-iroh491>3.3.co;2-7

Cited by 14 publications

(11 citation statements)

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“…Taxa from the freshwater community have been already reported in some freshwater ecosystems in Côte d'Ivoire (Yté et al 1996;Aka et al 2000) or in other West African countries as Senegal (Kâ et al, 2006) and Nigeria (Egborge, 1994). They are also common in South American countries (Aoyagui & Bonecker, 2004).…”

Section: Discussionmentioning

confidence: 91%

Spatio-temporal variations of the zooplankton abundance and composition in a West African tropical coastal lagoon (Grand-Lahou, Côte d’Ivoire)

et al. 2008

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Zooplankton constitutes a sensitive tool for monitoring environmental changes in coastal lagoons; however, the available information on zooplankton communities is not sufficient to optimize their rational management. The relationships between zooplankton distribution and environmental factors were studied in a tropical lagoon to test whether the indicator properties of zooplankton assemblages could be used to monitor water quality, in a context of expected eutrophication provoked by an increasing anthropogenic activity. Twenty-one (21) stations were sampled monthly from January to December 2004. The community was composed of 65 taxa including Copepoda, Rotifera, and Cladocera. Copepoda was the most abundant group (81% of total numbers). The main zooplankton species were Oithona brevicornis, Acartia clausi, and Brachionus plicatilis. The highest zooplankton abundance (171-175 ind. l -1 ) was recorded during the long, dry season (February-April) and the lowest (40-45 ind. l -1 ) during the rainy and the flood periods (June-July). At a spatial level, the lowest abundance was observed in the estuarine zone. During the dry seasons (December-April and AugustSeptember), marine zooplankton taxa were abundant near the channel of Grand-Lahou, and brackish water taxa dominated in the other sites. Multivariate analyses (Co-inertia) showed that the composition of zooplanktonic communities and their spatio-temporal variations were mainly controlled by salinity variations closely linked to the climatic and hydrological context. The role of the trophic state on zooplankton communities could not be clearly evidenced. Our results and a comparison with previous studies in the neighboring, highly polluted Ebrié Lagoon suggest that the ratio between Oithona and Acartia abundance could be used as biological indicator for the water quality.

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Section: Discussionmentioning

confidence: 91%

Spatio-temporal variations of the zooplankton abundance and composition in a West African tropical coastal lagoon (Grand-Lahou, Côte d’Ivoire)

et al. 2008

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“…This could be a consequence of high water turbidity, since it can be a limiting factor for zooplankton abundance (Hart, 1990). However, the role of turbidity could not be evaluated with certainty in the absence of information on visual predators (Aka et al, 2000). The main possible mechanism resulting in lower abundance of cladocera resulted with reduction of filterfeeding rate by sulphate salts which associate in significantly reduced oxygen consumption shown by Soucek (2007).…”

Section: Discussionmentioning

confidence: 99%

Crustacean plankton community (Crustacea: Copepoda and Cladocera) in gypsum karst lakes and their relation to abiotic parameters

et al. 2010

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Two gypsum karst lakes and one nongypsum karst lake were studied for copepod and cladoceran species composition in relation to specific habitat characteristics. The investigation was conducted from March to June 2007. Four copepod and six cladoceran species were recorded. Gypsum karst lakes are characterized as sulphate lakes and they show significant differences from non-gypsum karst lakes in conductivity, TDS, alkalinity, calcium and sulphates. Data on environmental variables and zooplankton were analyzed using redundancy analysis (RDA). The model explained 65.73% of the variance of the crustacean zooplankton and environmental data by the first two axes. The analysis confirmed that the major environmental variables influencing zooplankton in gypsum karst lakes are conductivity, TDS, calcium and sulphates. In the non-gypsum karst lake, on the contrary, the major variables were oxygen concentration and alkalinity. Specific habitat characteristics of gypsum karst lakes influence the zooplankton community by reducing the number of species and leading to the dominance of one of them.

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“…The disparities between food particles and grazers are accentuated in tropical shallow freshwater ecosystems by the scarcity of large cladocerans (Daphnia) and calanoids, and the dominance of small grazers such as small cladocerans and rotifers (Aka et al, 2000;Fernando, 2002). Havens et al (1996) suggested that poor control of phytoplankton biomass by herbivorous macrozooplankton may be a common feature of lowland tropical and subtropical lakes.…”

Section: Introductionmentioning

confidence: 99%

Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

Mendoza-Vera

Bouvy

et al. 2011

Hydrobiologia

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Zooplankton may at times graze cyanobacteria. However, their top-down effects are considered to be low, particularly in tropical regions dominated by small-size grazers that may be unable to consume efficiently filamentous or colonial species. Recently, cyanobacteria blooms were reported in the Senegal River hydrosystem. We conducted feeding experiments to assess the ability of copepods (Pseudodiaptomus hessei and Mesocyclops ogunnus), cladocerans (Moina micrura and Ceriodaphnia cornuta), and rotifers (Brachionus angularis, B. falcatus, and Keratella sp.) to control different cyanobacteria (Cylindrospermopsis raciborskii, Anabaena solitaria, A. flos-aquae, and Microcystis aeruginosa). None of the zooplankton species ingested M. aeruginosa. Mesocyclops ogunnus did not consume any of the cyanobacteria. Both cladocerans consumed the smallest filaments of cyanobacteria, whereas all the rotifers and P. hessei consumed a broader food-size spectrum. The functional feeding responses suggest that the concentration and size of the filaments are not the sole criteria for food consumption. The high zooplankton community grazing rates, estimated by applying the clearance rates measured in the laboratory to the in situ zooplankton abundance, indicate that grazing by zooplankton potentially constitutes an important controlling factor for the filamentous cyanobacteria in the tropics.

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Zooplankton Variability in 49 Shallow Tropical Reservoirs of Ivory Coast (West Africa)

Cited by 14 publications

References 0 publications

Spatio-temporal variations of the zooplankton abundance and composition in a West African tropical coastal lagoon (Grand-Lahou, Côte d’Ivoire)

Spatio-temporal variations of the zooplankton abundance and composition in a West African tropical coastal lagoon (Grand-Lahou, Côte d’Ivoire)

Crustacean plankton community (Crustacea: Copepoda and Cladocera) in gypsum karst lakes and their relation to abiotic parameters

Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

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