Capacités de croissance et facteurs de régulation en cultures monospécifiques chez les cladocères Moina micrura et Diaphanosoma excisum et le copépode Thermocyclops decipiens de Côte d'Ivoire (Afrique de l'Ouest).

Pagano, Marc; Saint‐Jean, Lucien; Arfi, Robert; Bouvy, Marc; Shep, Helguilé

doi:10.1016/s0990-7440(00)00152-2

Cited by 22 publications

(1 citation statement)

References 24 publications

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“…Amarasinghe et al (1997) found a maximum r of D. excisum at 32.58C of only 0.15, compared to 0.8 in our study. On the other hand, population growth rate of D. excisum in a monospecific microcosm culture at 25-298C which was fertilized, inoculated with natural phytoplankton assemblages, and included bacteria was 0.75 d 21 (Pagano et al 2000). Under field conditions, bacteria represent an important part of Diaphanosoma diet.…”

Section: Genetic Variation In Tpcsmentioning

confidence: 99%

Thermal reaction norms of a subtropical and a tropical species of Diaphanosoma (cladocera) explain their distribution

Pajk

Zhang

Han

et al. 2017

Limnology & Oceanography

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Species distribution boundaries are often associated with aspects of climate and modified by competitive interactions. In the tropical region, Diaphanosoma is the most diverse genus of Cladocera. Diaphanosoma dubium is widely distributed in China, whereas the tropical Diaphanosoma excisum is restricted to the islands off the south China coast. The mean temperature of the coldest month at the northern limit of its distribution is 15°C. We studied the effect of temperature (10–40°C) on life history traits of clones from 16 populations of D. dubium and D. excisum in life‐table experiments in order to determine if their thermal performance curves (TPCs) explain their distribution and to estimate the extent and mode of genetic variation in their TPCs. Our results show that both species have higher optimum temperatures (To ∼ 33°C), critical thermal minimum (CTmin = 10–15°C), and maximum (CTmax = 39–40°C) than temperate cladocerans. Clones of D. excisum had narrower TPCs and higher To than D. dubium clones, in accordance with predictions based on changes of temperature distributions with latitude. Significant levels of genetic variation in TPCs were present in both species. D. excisum had higher fitness than D. dubium at all temperatures above 15°C. However, at 15°C and below, D. dubium fitness was higher. Negative r at 15°C and below in combination with competition with the more cold‐adapted D. dubium exclude D. excisum from mainland China. TPCs of interacting species may be the basis of predicting future species distributions as temperature increases change the balance of biotic interactions.

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Section: Genetic Variation In Tpcsmentioning

confidence: 99%

Thermal reaction norms of a subtropical and a tropical species of Diaphanosoma (cladocera) explain their distribution

Pajk

Zhang

Han

et al. 2017

Limnology & Oceanography

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Responses of Planktonic Microorganisms from Tropical Reservoirs to Paraquat and Deltamethrin Exposure

Leboulanger

Bouvy

Pagano

et al. 2008

Arch Environ Contam Toxicol

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This study focused on the effects of two pesticides, paraquat (herbicide) and deltamethrin (insecticide), which are two common molecules used intensively in Burkina Faso. Natural bacterial populations, phytoplankton cultures (one cyanobacterium, Cylindrospermopsis raciborskii, and one chlorophycea, Monoraphidium sp.), and two species of zooplankton (Diaphanosoma excisum and Moina micrura) were isolated from aquatic communities and were used as biological targets in the experimental protocols. Paraquat was moderately toxic to bacteria and phytoplankton, whereas deltamethrin was significantly toxic only to the zooplankton species. Paradoxically, the chlorophycea Monoraphidium sp. exhibited a significant increase of in vitro fluorescence after 48 h at the highest doses. Preliminary tests were also performed from natural water extract of the main drinking water supply of the country (Loumbila Reservoir) by using solid-phase extraction. Obviously, the natural extract proved to be toxic to the same biological targets. Despite the absence of any determination of pesticides in the natural extract, the question of contamination and toxicity of these waters affects concerns about the safety of water supply and the effect of human pressure on the dynamics of planktonic communities of freshwater reservoirs in arid regions of western Africa.

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Comparison of the Effects of Two Herbicides and an Insecticide on Tropical Freshwater Plankton in Microcosms

Leboulanger

Bouvy

Carré

et al. 2011

Arch Environ Contam Toxicol

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Natural plankton communities from a tropical freshwater reservoir (Combani Reservoir, Mayotte Island, Mozambique Channel) were exposed, in 20-l nutrient-enriched microcosms, to two nominal concentrations of three pesticides: the herbicides diuron (2.2 and 11 μg/l) and paraquat (10 and 40.5 μg/l) and the insecticide fenitrothion (10 and 100 μg/l), commonly used in the tropics for agriculture and disease vector control. Bacterioplankton, phytoplankton, and zooplankton communities were monitored for 5 days after exposure, and the concentrations of toxicant and major nutrients were measured. Bacterioplankton growth was noticeable in all systems and was slightly affected by pesticide at any concentration. A transitory increase in thymidine-based bacterial production was observed in diuron- and fenitrothion-treated microcosms, followed by a marked decrease in all microcosms after 5 days. The functional diversity of bacterioplankton, evaluated using BIOLOG ECO(®) microplates, was reduced by exposure to the highest pesticide concentrations. Phytoplankton was affected by pesticides in different ways. Chlorophyll biomass and biovolumes were increased by diuron addition and decreased by paraquat, whereas fenitrothion-treated microcosms remained unaffected relative to controls. Phytoplankton taxonomic diversity was decreased by paraquat and high doses of fenitrothion but was unaffected by addition of diuron. The decrease in diversity was due to a reduction in the number of species, whereas the density of small cells increased, especially after addition of paraquat. Heterotrophic flagellates were sensitive to paraquat and to the highest diuron concentration; a reduction in biomass of up to 90% was observed for 40.5 μg/l paraquat. Zooplankton, dominated by Thermocyclops decipiens and Diaphanosoma excisum, was slightly sensitive to diuron, and very sensitive to paraquat. High concentrations of the insecticide fenitrothion were effective only on young stages. The potential direct and indirect effects of pesticide contamination on such a simplified plankton food web, typical of newly constructed reservoirs, appear to differ significantly depending on the biological compartment considered. The overall sensitivity of tropical plankton is comparable to the sensitivity for temperate systems, and direct and indirect effects appeared rapidly, within 5 days of exposure.

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Capacités de croissance et facteurs de régulation en cultures monospécifiques chez les cladocères Moina micrura et Diaphanosoma excisum et le copépode Thermocyclops decipiens de Côte d'Ivoire (Afrique de l'Ouest).

Cited by 22 publications

References 24 publications

Thermal reaction norms of a subtropical and a tropical species of Diaphanosoma (cladocera) explain their distribution

Thermal reaction norms of a subtropical and a tropical species of Diaphanosoma (cladocera) explain their distribution

Responses of Planktonic Microorganisms from Tropical Reservoirs to Paraquat and Deltamethrin Exposure

Comparison of the Effects of Two Herbicides and an Insecticide on Tropical Freshwater Plankton in Microcosms

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