Smallest eukaryotic organism

Courties, Claude; Vaquer, André; Troussellier, Marc; Lautier, Jacques; Chretiennot-Dinet, M. J.; Neveux, Jacques; Machado, C. O. F.; Claustre, Hervé

doi:10.1038/370255a0

Cited by 334 publications

(281 citation statements)

References 7 publications

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“…Except for July, chl a concentrations remained near or below 0.9 µg l -1 at stations inside the shellfish farming zone. These low chl a levels are very close to the concentration of 0.51 µg l -1 reported for the mean annual picophytoplankton biomass in Thau lagoon (Courties et al 1994). Moreover, insignificant/low daily variations at these stations indicate that phytoplankton was filtered as soon as it was produced through PP.…”

Section: Discussionsupporting

confidence: 48%

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Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Souchu

Vaquer²,

Collos³

et al. 2001

Mar. Ecol. Prog. Ser.

148

108

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Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges. The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time. In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by only a few percent of oxygen concentrations in their vicinity, but the mean (± SE) deficits of chlorophyll a and POC concentrations were 44 ± 4% and 26 ± 9% respectively in the eastern zone (8 m). The shift induced by filter feeders in phytoplankton composition favoured picophytoplankton with higher growth rates. But the summer increase in phytoplankton growth rate was stronger than the positive feedback due to filter feeder filtration. Summer was determinant for the growth of oysters owing to enhanced regenerated primary production. During this period, filter feeders were not food limited, while they tended to control phytoplankton biomasses and production the rest of the year. The nutrient excess in shellfish farming zones was highly significant, with increases of 73 ± 16, 36 ± 12 and 19 ± 8% for ammonia, phosphates and silicate respectively in the eastern zone. In the western zone, the nutrient excess was less strong by half for ammonia and phosphate, because the lower depth (4 m) allows light to reach the bottom and enables benthic macroflora to grow on nutrients of benthic origin. The decline of phytoplankton biomasses in shellfish farms induced a decrease in the nutrient demand, especially for ammonia. This situation was likely to favour nitrification, which led during autumn to higher nitrate concentrations within shellfish farming zones than outside. Therefore, filter feeders were able to alter the dominant biogeochemical process in the water column by stimulating nitrification. KEY WORDS: Suspension-feeding bivalves · Phytoplankton · Nutrient cycling · Carrying capacity · Thau lagoonResale or republication not permitted without written consent of the publisher

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Section: Discussionsupporting

confidence: 48%

“…However, in summer, picophytoplankton, and notably Ostreococcus tauri, production is largely responsible for the strong increase of P :B ratios (Courties et al 1994). O. tauri was reported to have a maximum growth rate of 4.2 divisions d -1 in cultures (Courties et al 1998), which can match those of diatoms (Furnas 1990).…”

Section: Discussionmentioning

confidence: 86%

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Souchu

Vaquer²,

Collos³

et al. 2001

Mar. Ecol. Prog. Ser.

148

108

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“…In 1994, the smallest of the Mamiellales, actually the smallest free-living eukaryote known on the planet (as small as 0.7-0.8 mm diameter), Ostreococcus tauri (Fig. 6.2b), was discovered (Courties et al 1994). Ostreococcus and Bathycoccus have the same limited number of organelles as Micromonas.…”

Section: Photoautotrophsmentioning

confidence: 99%

Ecology and Diversity of Picoeukaryotes

Worden

Not

2008

Microbial Ecology of the Oceans

142

105

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“…There have only been a few studies comparing the efficiency of these different techniques (4,11), even though FCM has been reported to be 1 and 2 times more efficient (11,26). It has been successfully used to analyze and count microbial communities such as protist, small algae, bacteria and viruses (3,14,25,27,35).…”

Section: Introductionmentioning

confidence: 99%

Virioplankton Abundance in Trophic Gradients of an Upwelling Field

Pereira¹,

Granato²,

Figueiredo³

et al. 2009

Braz. J. Microbiol.

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This work correlates time series of biological and physical variables to the marine viruses across trophic gradients within Arraial do Cabo upwelling system, Southeast of Brazil. The objective is to investigate the major controlling factors of virioplankton dynamics among different water masses. It was used an in situ and ex situ flow cytometry for accessing the plankton community. Viruses were highly correlated to bacteria and phytoplankton, but although the lack of direct correlation with physicals, upwelling turned out to be the main contributing factor to the highest values of viral abundance and virus:bacterial ratio.Our data suggest that the lowest temperature of upwelled South Atlantic Central Waters would help to maintain a high viral abundance and higher temperatures of Coastal and Tropical Waters might be another ecological niche allowing the co-existence.

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Smallest eukaryotic organism

Cited by 334 publications

References 7 publications

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon

Ecology and Diversity of Picoeukaryotes

Virioplankton Abundance in Trophic Gradients of an Upwelling Field

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