Seasonal impact of the microzooplankton on pico-and nanoplankton growth rates in the northwest Mediterranean Sea

Ferrier‐Pagés, Christine; Rassoulzadegan, Fereidoun

doi:10.3354/meps108283

Cited by 49 publications

(22 citation statements)

References 41 publications

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“…The wider range of variation observed in the Bay of Blanes may simply reflect the larger number of biomass estimates available there (Table 6). The dominance by naked heterotrophic oligotrichs of the ciliate community growing in the Bay of Blanes 1s in agreement with previous studies in the Mediterranean Sea (Ferrier-Pages & Rassoulzadegan 1994, Dolan & Marrase 1995 and appears to be characteristic of most marine and brackish water ecosystems (Beers et al 1980, Smetacek 1981, Andersen & Sorensen 1986, Sherr et al 1986, Dolan & Coats 1990, Nielsen & Kiorboe 1991. Maximum val.ues for mixotrophic oligotrichs were 1 order of magnitude higher in this coastal area (Table 3) (Dolan & Marrase 1995).…”

Section: Interannual Variability In Ciliate Abundance and Biomasssupporting

confidence: 91%

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Dynamics of ciliate abundance, biomass and community composition in an oligotrophic coastal environment (NW Mediterranean)

Vaqué¹,

Ha²,

DuarteCM³

1997

Aquat. Microb. Ecol.

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The importance of ciliates as components of the microbial community of the oligotrophic coastal area of the Bay of Blanes (NW Mediterranean Sea) was examined based on a 3 yr, high resolution study focused on the composition, abundance and biomass of the ciliate community. The most abundant components of the ciliate community were 'oligotrich' ciliates. Naked oligotrichs included heterotrophic genera represented by Halteria, Strombidium, Strobilidium, and Lohrnaniella, as well as mixotrophic genera represented by Laboea and Tontonia and loricate ciliates represented by the group of tintinnids. Autotrophic ciliates were represented by the genus Mesodinium. Other, less abundant groups encountered throughout the study period included the orders Scuticociliatida, Pleurostomatida and Prorodontida. Ciliate community abundance and biomass did not show a simple seasonal pattern. Maximum values were observed in spring, following the winter phytoplankton blooms, throughout the study period. Ciliate communities showed significant interannual differences in abundance and cell size. However, total ciliate biomass (pg C I-') was similar among years. Changes in ciliate abundance and biomass were independent of temperature. Periods with persistent, heavy rainfall, which promotes pulses of allochthonous material from flushed rivers, were characterized by a reduced abundance of cili a t e~, and increased pico-and nanoplanktonic populations. Cross correlation analysis revealed that bacterial abundance and chlorophyll a (chl a ) concentration were both significantly negatively correlated with ciliate abundance, with time lags of 15 d, suggesting a role for cillates in the control of these communities. Examination of the variability of ciliate abundance and biomass at different time scales revealed a dominant scale of temporal variation in ciliate abundance at about 50 d, similar to that of chl a in the Bay of Blaiies, whereas total ciliate biomass (pg C I-') did not show any dominant scale of variation KEY WORDS Coastal area . Ciliate abundance and biomass . Community composition . Rainfall .

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Section: Interannual Variability In Ciliate Abundance and Biomasssupporting

confidence: 91%

“…Smetacek 1981, Nielsen & Kisrboe 1991, Bernard & Rassoulzadegan 1994, Ferrier-Pages & Rassoulzadegan 1994. To extend our knowledge of the temporal patterns of ciliate abundance, biomass and composition on the NW Mediterranean coast, we conducted a 3 yr intensive sampling program in the oligotrophic coastal area of the Bay of Blanes.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of ciliate abundance, biomass and community composition in an oligotrophic coastal environment (NW Mediterranean)

Vaqué¹,

Ha²,

DuarteCM³

1997

Aquat. Microb. Ecol.

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“…In terms of qualitative composition of the ciliate assemblages, aloricate ciliates numerically dominated (by 70%) both regions, this being in agreement with other studies in the Mediterranean (Ferrier-Pages & Rassoulzadegan 1994, Dolan & Marrase 1995 or other marine ecosystems (Beers et al 1980, Sherr et al 1986, Dolan & Coats 1990. Mixotrophic species represented 33 % of the aloricate species during spring in the Eastern basin whereas Laval-Peuto & Rassoulzadegan (1988) found 40.6% in the coastal Western Mediterranean during autumn and winter.…”

Section: Nanociliatessupporting

confidence: 79%

Planktonic ciliates in the oligotrophic Eastern Mediterranean:vertical, spatial distribution and mixotrophy

Pitta¹,

Giannakourou²

2000

Mar. Ecol. Prog. Ser.

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Abundance, biomass, vertical distribution, species composition and rnivotrophy of planktonic ciliates were investigated during March 1997 in the oligotrophic Eastern Mediterranean. Six depth layers were sampled in the euphotic zone (0 to 100 m) at 7 stations in the North and 4 in the South Aegean Sea, resulting in a total of 66 samples and 82 ciliate species. Abundance was in general very low (0 to 780 cells I-') except from specific stations in the North Aegean stations (20 to 2040 cells I-'), influenced by the Black Sea Water. Aloricate species dominated the depth-integrated abundance and biomass in both the North and the South. South Aegean stations presented more diverse cihate fauna, uniform distribution down to 100 m and higher values of integrated abundance and biomass than the North Aegean stations. Among North stations, those subjected to the influence of the Black Sea presented very pronounced stratification, with mixotrophs and heterotrophs decreasing sharply below 20 m; at these stations, mixotrophic species of 18 to 30 pm dominated the ciliate community at the surface whereas at the South as well as at the rest of the North stations, nanociliates were the major mivotrophic size class Mixotrophs (20% of abundance in the South, 38% in the North) and nanoc~li-ates (28% of abundance in the South, 44% in the North) were found to be very important components of the community, which indicates that these organisms play also an important role in oligotrophic systems.

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“…Some of this effect can be attributed to nutrient release during phagotrophic feeding, especially in the microbial loop (e.g., Güde, 1985;Caron, 1994). Further contributions come from the death and lysis of bacteria (Renn, 1937) and by stimulation of bacterial hydrolytic enzymes mediating remineralization of inorganic nutrients such as phosphorus and nitrogen (Hadas et al, 1992;Ferrier-Pagès and Rassoulzadegan, 1994). In heterotrophic microbial communities, organic carbon compounds are a major source of nutrients for bacteria at the base of the food web (e.g., Ducklow, 2000;Anderson and McGuire, 2013).…”

Section: Introductionmentioning

confidence: 99%

Evidence for Coupling of the Carbon and Phosphorus Biogeochemical Cycles in Freshwater Microbial Communities

Anderson

2018

Front. Mar. Sci.

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Considerable attention has been given to the roles of the carbon and phosphate cycles in aquatic environments, but less attention has been given to an experimental analysis of the coupling of the C and P cycles in freshwater and marine ecosystems. Using laboratory microcosm experiments, prepared with natural pond-water microbial communities, evidence is presented for the coupling of dissolved organic C with microbial production of alkaline phosphatase driving the phosphorus cycle in freshwater microbial communities. The effects of glucose C-supplementation in microcosm microbial communities (including bacteria and heterotrophic nanoflagellates) on gains in microbial C-content and alkaline phosphatase activity (APA) were estimated in relation to control microcosms without C-supplementation. The C-supplementation increased total microbial APA (pmol min −1 µg −1 bacterial C) in the C-supplemented treatment (6.5 ± 0.6) compared to the non-supplemented cultures (5.1 ± 1.7). Microbial-bound APA in the C-supplemented treatment was particularly enhanced (4.4 ± 0.9) compared to control cultures (1.3 ± 0.8), but the amount of free (soluble) APA in the aquatic phase was less compared to the controls (n = 5, p < 0.001). Alkaline phosphatase activity was highly correlated (r = 0.97) with bacterial densities in the C-supplemented cultures, further supporting the hypothesis that C-supplementation can increase phosphorus remineralization through elevated production of microbial alkaline phosphatase. This laboratory-based, experimental study suggests that additional research on the coupling of the C and P cycles in freshwater and marine environments may yield productive insights into the finer details of the roles of these two biogeochemical cycles in aquatic microbial community dynamics.

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Seasonal impact of the microzooplankton on pico-and nanoplankton growth rates in the northwest Mediterranean Sea

Cited by 49 publications

References 41 publications

Dynamics of ciliate abundance, biomass and community composition in an oligotrophic coastal environment (NW Mediterranean)

Dynamics of ciliate abundance, biomass and community composition in an oligotrophic coastal environment (NW Mediterranean)

Planktonic ciliates in the oligotrophic Eastern Mediterranean:vertical, spatial distribution and mixotrophy

Evidence for Coupling of the Carbon and Phosphorus Biogeochemical Cycles in Freshwater Microbial Communities

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