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>3.0.co;2-g

Cited by 45 publications

(20 citation statements)

References 28 publications

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“…Co-inertia analysis revealed that rotifers were more abundant in terms of density than copepods and cladocerans in the most eutrophic, turbid and deoxygenated reservoirs, as reported by Arcifa (1984) in 10 reservoirs in southern Brazil and by Aka et al (2000) in 49 shallow African reservoirs. These investigations in tropical regions demonstrate that rotifers are more linked to eutrophic conditions than copepods or cladocerans, and corroborate the fact that rotifers require higher food concentrations than crustaceans (DeMott 1989).…”

Section: Biological Contextmentioning

confidence: 70%

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Bouvy¹,

Falcão²,

Marinho³

et al. 2000

Aquat. Microb. Ecol.

237

139

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ABSTRACT:The relationship between the trophic state of 39 reservoirs located in the semi-arid region of north-east Brazil and their planktonic structure was examined by a sampling survey during the 1998 drought (September to November). A total of 30 environmental and biological parameters, with special attention paid to phytoplankton, were studied once at each reservoir to obtain a synoptic view at a state scale (Pernambuco State). The application of the chlorophyll a-total phosphorus standard relationship for grades of eutrophication revealed a classification in which 90% of the sites were eutrophic-hypertrophic. Among the 202 taxa identified in the phytoplankton assemblages, the cyanobacterium Cylindrospermopsis (Wolsz.) Seenayya et Subba Raju represented more than 80% of the total phytoplankton density in 10 reservoirs and more than 50% in 17 reservoirs. The rarity of other phytoplanktonic groups in the case of the Cylindrospermopsis dominance is the most significant biological feature of these reservoirs. Although rotifers were more closely linked to hypereutrophic conditions than copepods or cladocerans, this dominant group did not seem to play an efficient role in cyanobacterial control. A statistical approach based on the analysis of cross tables (co-inertia analysis) allows us to describe species-environment relationships with a special focus on the factors governing the presence of Cylindrospermopsis. As determined by hierarchical analysis, a major group of studied reservoirs (70%) corresponded to deeper, warmer and hypertrophic reservoirs characterized by the combination of (1) low ammonia concentration, high temperature and pH values, and (2) high percentages of Cylindrospermopsis abundances. Lack of water renewal in 1998 linked to the 1997 El Niño consequences seems to be a major determinant for both trophic conditions and Cylindrospermopsis dominance in the reservoirs studied.KEY WORDS: Bacteria · Phytoplankton · Zooplankton · Cylindrospermopsis · El Niño event · Reservoirs · Co-inertia analysis Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 23: [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] 2000 Cyanobacteria are recognized as a critical problem worldwide and their blooms are typical phenomena in eutrophic lakes, often linked to external nutrient enrichment (Paerl 1988). The influence of local climatological factors (e.g. wind, light intensity, temperature) can accelerate these phenomena and modify the phytoplankton structure, as cyanobacteria are strongly driven by physical factors such as local weather conditions (e.g. Tóth & Padisák 1986, Fabbro & Duivenvoorden 1996. Other factors that potentially influence the biomass and composition of phytoplankton include a stable water column with a turbulence limitation defined as a high ratio between the mixing zone and the euphotic zone (Soranno 1997). In addition, cyanobacteria are inedible prey for many zooplankton organisms because of their large colony size, their toxic effects and low...

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Section: Biological Contextmentioning

confidence: 70%

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Bouvy¹,

Falcão²,

Marinho³

et al. 2000

Aquat. Microb. Ecol.

237

139

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“…Ces mois correspondent à la saison sèche qui est une période de fort stress pour ce type d'écosystème aquatique tel que décrit par Aka et al (2000), Thomas et al (2000) et Arfi et al (2001) …”

Section: Echantillonnage Des Macroinvertébrésunclassified

Inventaire et distribution spatio-temporelle des macroinvertébrés bioindicateurs de trois plans d’eau du bassin de la Volta au Burkina Faso

Sanogo¹,

Kabre²,

Cecchi³

2014

Int. J. Bio. Chem. Sci

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“…Assim, com a exceção de C. cornuta, que teve crescimento populacional negativo no intervalo do sexto para o nono dia na fração < 10 μm evidenciando incompetência para se alimentar com sucesso nessa faixa de tamanho, todas as populações mostraram-se capazes de se manter, independentemente da fração de seston disponível como alimento. É claro que organismos com deficiência nutricional não poderiam apresentar este tipo de comportamento (CHOUERI et al, 2007) e isso é relevante na intenção de demonstrar que são as frações menores do seston as que constituem a base alimentar do zooplâncton tropical, caracterizado por ser de pequeno porte (AKA et al, 2000) e ineficientes filtradores de partículas grandes (PAGANO, 2008).…”

Section: Discussionunclassified

Crescimento populacional e análise isotópica de Diaphanosoma spinolosum e Ceriodaphnia cornuta (Crustacea: Cladocera), alimentadas com diferentes frações de seston natural

Caraballo¹,

Sanchez-Caraballo

Forsberg³

et al. 2011

Acta Sci. Biol. Sci.

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RESUMO. Para definir o efeito do seston como fonte de alimento para Ceriodaphnia cornuta e Diaphanosoma spinolosum durante a enchente no lago Catalão (Amazônia Central) foram desenvolvidos experimentos "in situ", utilizando a variação natural de δ 13 C e δ 15 N como traçadores de alimento. As duas espécies tiveram acesso a três diferentes frações de seston (< 10, < 30 e < 60 μm) sendo mantidas em garrafas plásticas de 1,1 L submersas, durante nove dias. As atividades foram iniciadas com uma população de dez indivíduos em cada frasco, com três frascos por cada fração e quatro intervalos de tempo, para um total de 27 frascos por espécie. A cada três dias, foram coletados três frascos e os organismos foram fixados para contagem e observação de parâmetros populacionais. Os organismos nos últimos três frascos de cada fração foram fixados com formalina e usados para análise de isótopos estáveis de carbono e nitrogênio. As duas espécies cresceram em todas as frações de alimento, sendo melhor seu desempenho populacional na fração < 30 μm. D. spinolosum e C. cornuta apresentaram enriquecimento nos valores de δ 13 C e δ 15 N, sendo maior na fração < 10 μm. Estes resultados sugerem que as frações do seston testadas produzem diferentes taxas de crescimento populacional e assinaturas isotópicas nos cladóceros.Palavras-chave: dinâmica populacional; cladóceros; ecologia isotópica.ABSTRACT. Population growth and stable isotope analyses of Diaphanosoma spinolosum and Ceriodaphnia cornuta (Crustacea: Cladocera) fed with different seston size fractions. In order to define the effect of seston size fraction as a food source for Ceriodaphnia cornuta and Diaphanosoma spinolosum, in situ experiments using natural abundance of δ 13 C and δ 15 N were carried out during the rising water period in Catalão Lake. Both species were fed with three different fractions of seston from the lake (< 10, < 30 and < 60 μm) and maintained in submerged 1.1 L plastic bottles for nine days. Ten individuals were put in each flask, maintaining three flasks for each fraction, for a total of 27 flasks per species. Every three days we collected three flasks and fixed the individuals for subsequent counting and observation of demographic population parameters. The organisms in the last three flasks of each fraction were fixed for stable isotope analysis of δ 13 C and δ 15 N. Both species grew in all of the food fractions, with the best the performance coming in the < 30 μm fraction. D. spinolosum and C. cornuta showed enrichment in δ 13 C and δ 15 N, which was highest in the < 10 μm fraction for both species. These results show that the seston size fractions tested produce different population growth rates and isotopic signatures in cladocerans.

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

Cited by 45 publications

References 28 publications

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Inventaire et distribution spatio-temporelle des macroinvertébrés bioindicateurs de trois plans d’eau du bassin de la Volta au Burkina Faso

Crescimento populacional e análise isotópica de Diaphanosoma spinolosum e Ceriodaphnia cornuta (Crustacea: Cladocera), alimentadas com diferentes frações de seston natural

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