Etude du régime alimentaire de cinq espèces de Cladocères dans la retenue Lalla Takerkoust (Maroc)

Correspondence: J. Flores-BurgosIn the present work we tested the effect of Chlorella vulgaris and Scenedesmus acutus in different proportions on the population growth of Brachionus calyciflorus, Brachionus patulus, Ceriodaphnia dubia, and Moina macrocopa. In general, both rotifer species grew well on either type of algae. Regardless of algal mixture, B. calyciflorus had a shorter initial phase, while B. patulus needed more than a week to begin the exponential phase of growth. Both the rotifer species showed consistently better population growth with Chlorella than on Scenedesmus, or the mixture. At any given algal combination, B. patulus had higher peak values than B. calyciflorus.The rate of population increase (r) for both the rotifers varied from 0.18 to 0.48 d -1 depending on the algal type and combination. Regardless of algal type and combination, B. calyciflorus had a much higher value of r than B. patulus. Both C. dubia and M. macrocopa grew on the algal types, whether offered separately or in mixture. Regardless of the treatment type, C. dubia needed a longer period (about 2 weeks) than M. macrocopa to reach peak abundances. Thus, our study did not support the view that Scenedesmus is consistently superior to Chlorella as a basic diet to the tested species of zooplankton. Populationswachstum von Zooplanktern (Rotatorien und Cladoceren) bei Ernährung mit Chlorella vulgaris und Scenedesmus acutus in unterschiedlichen Anteilen Untersucht wird der Einfluss von Chlorella vulgaris und

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Population Growth of Zooplankton (Rotifers and Cladocerans) Fed Chlorella vulgaris and Scenedesmus acutus in Different Proportions

Flores-Burgos

Sarma

2003

Acta hydrochim. hydrobiol.

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Invasibility of a reservoir to exotic Daphnia lumholtzi: experimental assessment of diet selection and life history responses to cyanobacteria

2003

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SUMMARY 1. In reservoirs of the south‐central United States, the exotic cladoceran Daphnia lumholtzi is common during warm midsummer conditions, when cyanobacteria are abundant and native Daphnia are rare. In the current study, we employed surveys, field experiments, and a life table experiment to investigate the role of food quality in explaining the distribution and phenology of D. lumholtzi, relative to two native species (Daphnia parvula and Daphnia mendotae). 2. During May–September 2000 in eutrophic McDaniel Lake, Missouri U.S.A., cyanobacteria (primarily Oscillatoria) first appeared at 6‐m depth and then became abundant throughout the epilimnion. 3. During the May field experiment, D. lumholtzi, D. parvula and D. mendotae all consumed a similar diet of algae, showing positive selection for small greens (chlorophytes and cryptophytes <20 μm). During the July experiment, when the epilimnion exceeded 25 °C and cyanobacteria were common in the lake, D. lumholtzi consumed significantly more total algae and more cyanobacteria than the two native species. Although the Daphnia selected against cyanobacteria, all three species consumed about 25% of this food in their diet. 4. A life table experiment compared the responses of D. lumholtzi and D. parvula with variation in density of high‐quality food (Ankistrodesmus) and concentration of a toxic strain of cyanobacteria (Anabaena flos‐aquae). Both Daphnia species showed reduced survivorship, fertility and intrinsic rates of increase in response to elevated concentrations of cyanobacteria, particularly at the higher food level. 5. The results suggest that D. lumholtzi shows similar inhibition from cyanobacteria as does the native Daphnia. However, their continued high in situ feeding rates imply that D. lumholtzi is less affected by midsummer conditions in warm‐water reservoirs than are native Daphnia.

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Food selectivity of Ceriodaphnia quadrangula (O. F. Müller, 1785) (Cladocera) and its impact on competition outcome between two freshwater green algae

Tellioğlu

2013

Crustac

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The present work tested the food selectivity of the cladoceran Ceriodaphnia quadrangula (O. F. Müller, 1785) and its impact on competition outcome between Chlorella vulgaris Beijerinck, 1890 and Chlamydomonas globosa J. W. Snow, 1902. Freshwater green algae, Chlorella, have heavy cell walls and their size usually exceeds the lower limits of hmb size of Ceriodaphnia. According to the optimal foraging theory, it is speculated that Ceriodaphnia would graze on the more exposed and relatively larger Chlamydomonas rather than on Chlorella, and this process would lead to smallsized Chlorella becoming a superior competitor in the presence of Ceriodaphnia. This work used Ceriodaphnia, Chlamydomonas globosa and Chlorella vulgaris to test this hypothesis. The grazing experiment showed that Ceriodaphnia preferred Chi. globosa to Ch. vulgaris, regardless of the concentration and relative abundance of these algae. The decrease in relative abundance of highquality Chlamydomonas in Chlamydomonas-Chlorella assemblages did not diminish the grazing efficiency of Ceriodaphnia on this algal species, but increased the selectivity of small-sized cells of Chlorella. However, when the concentration of Chlamydomonas was extremely high, the grazing of Ceriodaphnia on Chlamydomonas decreased. In competition experiments, it was observed that the presence of Chlamydomonas restrained the growth potential of Chlorella; however, the introduction of Ceriodaphnia into the competing environment weakened this influence and to some extent enhanced the growth ability of Chlorella. The different densities of Ceriodaphnia had an obvious influence on the competition outcome between Chlamydomonas and Chlorella. RÉSUMÉCette étude a testé la sélection de la nourriture par le cladocère Ceriodaphnia quadrangula (O. F. Müller, 1785) et son impact sur les résultats de la compétition entre Chlorella vulgaris Beijerinck, 1890 et Chlamydomonas globosa J. W. Snow, 1902. Les algues vertes d'eau douce Chlorella, ont des parois cellulaires épaisses et leur taille dépasse généralement la taille limite inférieure des appendices de Ceriodaphnia. Selon la "théorie de ravitaillement optimal" ["optimal foraging theory"], il est admis que Ceriodaphnia devrait brouter sur les Chlamydomonas plus exposés et relativement plus grands que sur les Chlorella, et que ce processus devrait conduire les Chlorella de taille plus petite ')

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Etude du régime alimentaire de cinq espèces de Cladocères dans la retenue Lalla Takerkoust (Maroc)

Cited by 4 publications

References 23 publications

Population Growth of Zooplankton (Rotifers and Cladocerans) Fed Chlorella vulgaris and Scenedesmus acutus in Different Proportions

Population Growth of Zooplankton (Rotifers and Cladocerans) Fed Chlorella vulgaris and Scenedesmus acutus in Different Proportions

Invasibility of a reservoir to exotic Daphnia lumholtzi: experimental assessment of diet selection and life history responses to cyanobacteria

Food selectivity of Ceriodaphnia quadrangula (O. F. Müller, 1785) (Cladocera) and its impact on competition outcome between two freshwater green algae

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