Organic Matter, Carbon, Nitrogen and Phosphorus Contents of the Mesozooplankton, Mainly <i>Acartia clausi</i>, in a Tropical Brackish Lagoon (Ebrié Lagoon, Ivory Coast)

Pagano, Marc; Saint‐Jean, Lucien

doi:10.1002/iroh.19930780114

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…The individual carbon weights were calculated using length-dry weight relationships from Jerling & Wooldridge (1991) for P. hessei and from Bottrell et al (1976) for the other taxa. Dry weights were converted into carbon weights using an average carbon:dry weight ratio of 45% (Pagano & Saint-Jean, 1993). The mean zooplankton densities in the experimental jars were: 16 ind l -1 (150 lg C l -1 ) for P. hessei (adults), 80 ind l -1 (144 lg C l -1 ) for M. ogunnus (mixture of copepodites and adults), 100 ind l -1 (149 lg C l -1 ) for M. micrura (adult females), 300 ind l -1 (150 lg C l -1 ) Table 2 Experiments with Pseudodiaptomus hessei: concentration (Conc.)…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

Mendoza-Vera

Bouvy

et al. 2011

Hydrobiologia

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“…Molar bacterial and algal C:P ratios have been reported to vary between 15 and 170:1 and 80 and 900:1, respectively ( Tables 1 and 2). Crustacean zooplankton tend to be homeostatic in their carbon (C) to phosphorus (P) ratios (Anderson and Hessen, 1991; Sterner, 1993) and have low molar C:P ratios of about 100–130:1 (Hessen and Lyche, 1991; Pagano and St. Jean, 1993). Although recent findings showed that P‐limited daphnids can lose a significant amount of their P‐content (DeMott et al , 1998), zooplankton are much less variable in stoichiometry than algae and bacteria.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

Hochstädter

2000

Freshwater Biology

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Summary The C:P ratios of seston, bacteria, phytoplankton and zooplankton were measured twice a week in situ in mesotrophic, large and deep Lake Constance from April to December 1995. Except for zooplankton, a strong seasonality was exhibited with low C:P ratios during P‐enriched early spring conditions and high values during P‐depleted summer conditions. Molar C:P ratios of seston varied between 180:1 and 460:1 demonstrating moderate phosphorus limitation in spring and during the clear‐water phase, and strong limitation for the rest of the season. The sestonic C:P ratio increased significantly during two decades of re‐oligotrophication of Lake Constance, reflecting an enhanced phosphorus limitation of the plankton community in summer. Molar C:P ratios of bacteria and phytoplankton varied seasonally between 50:1 and 130:1 and 180:1 and 500:1, respectively, and indicate carbon or light limitation in winter and phosphorus limitation in summer. Zooplankton had a molar C:P ratio of about 124:115 which was nearly constant throughout the seasons. These differences in the C:P ratios of planktonic organisms have direct implications for phosphorus recycling within the food web as C:P ratios of excreta should be highly variable.

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“…Specimens of a mixed set of at least 30 individuals from all 21 stations were measured. Individual DWs were converted into carbon (C) using a C/DW ratio of 0.045 (Pagano and Saint-Jean, 1993). …”

Section: Sampling and Data Analysismentioning

confidence: 99%

Spatio-temporal Variability of Acartia clausi (Copepoda, Calanoida) Population Structure, Abundance, Body Length, and Biomass in a Tropical Coastal Lagoon (Grand-Lahou, Côte d’Ivoire)

Etilé¹,

Blahoua²,

Bédia³

et al. 2017

ijSciences

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ABSTRACT:The spatial and seasonal variations of Acartia clausi population structure, abundance, biomass and body length variation in relationship to environmental variables were investigated in the Grand-Lahou lagoon at 21 stations from January to December 2004. A. clausi abundance, biomass and body (prosome) length showed considerable seasonal and spatial variation. On average, total population abundance and biomass obtained during the dry season (Mean: 7.11 ind/l and 9.08 µgC/l respectively) were higher than that those which have gotten during the wet season (Mean: 2.98 ind/l and 2.76 µgC/l respectively). The same tendency was registered for prosome length of all development stages, with 275-1000 µm during the dry season versus 225-975 µm during the wet season. A. clausi population (without the nauplii) was dominated by copepodids stages in all seasons. During the dry season, on average, copepodids stages constituted 76.65% of total density and 52.98% of total biomass. During the wet season, copepodids stages represented 92.23% of total density and 72.42% of total biomass. In the adults stages, on average females (F) were more numerous than males (M), with a sex ratio (M/F) of 0.75. However, males were slightly more abundant than females during the dry season (February to April and September) with sex ratio (M/F) range from 1.10 to 1.46. Correlation on data of this study analyses showed that spatio-seasonal variations of A. clausi abundance, Biomass and Body length were mainly linked to water salinity, pH, transparency and dissolved oxygen, phosphates and nitrates concentrations.

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Organic Matter, Carbon, Nitrogen and Phosphorus Contents of the Mesozooplankton, Mainly Acartia clausi, in a Tropical Brackish Lagoon (Ebrié Lagoon, Ivory Coast)

Cited by 14 publications

References 18 publications

Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

Can tropical freshwater zooplankton graze efficiently on cyanobacteria?

Seasonal changes of C:P ratios of seston, bacteria, phytoplankton and zooplankton in a deep, mesotrophic lake

Spatio-temporal Variability of Acartia clausi (Copepoda, Calanoida) Population Structure, Abundance, Body Length, and Biomass in a Tropical Coastal Lagoon (Grand-Lahou, Côte d’Ivoire)

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