Heterotrophic dinoflagellates in the ecosystem of the Gulf of Gdansk

Bralewska, JM; Witek, Zbigniew

doi:10.3354/meps117241

Cited by 36 publications

(28 citation statements)

References 12 publications

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“…However. biomasses of heterotrophic flagellates >l00 pg C 1-' have sometimes been reported in temperate nearshore waters during diatom blooms (Hansen 1991, Bralewska & Witek 1995. Flagellate biomasses >l00 pg C 1-I observed In May (Figs.…”

Section: Protozooplankton Abundance and Biomassmentioning

confidence: 99%

Grazing by protists and seasonal changes in the size structure of protozooplankton and phytoplankton in a temperate nearshore environment (western Gulf of St. Lawrence, Canada)

Tamigneaux¹,

Mingelbier²,

Klein³

et al. 1997

Mar. Ecol. Prog. Ser.

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-Grazing by protists and seasonal changes in the size structure of protozooplankton and phytoplankton in a temperate nearshore environment (western Gulf of St. Lawrence, Canada)'~e p a r t e m e n t des Sciences biologiques, Universite du Quebec i Montreal, CP 8888, MontrBal, QuBbec, Canada H3C 3P8 2~e p a r t e m e n t de Biologie, Universite Laval, QuBbec. PO, Canada G l K 7P4ABSTRACT: Seasonal changes in the biomass and size structure of phytoplankton and protozooplankton and the grazing effect of protozooplankton on phytoplankton were assessed in a temperate nearshore environment (Baie des Chaleurs, western Gulf of St. Lawrence. Canada). The size structure of protozooplankton and phytoplankton assemblages showed relatively similar seasonal changes. During spring, dominance by large (>20 pm) heterotrophic or mixotrophic ciliates and flagellates coincided with high biomass of chain-forming diatoms, suggest~ng that protists were important grazers of the spring diatom bloom Dunng summer, concentrations and b~omass of ciliates and flagellates > 2 0 pm were lower than they were during spring and, consequently, the relative contribution of protists <20 pm increased. The potential grazing impact of ciliates <20 pm on single celled cyanobacteria was similar to or even higher than that of nanoflagellates. Grazing experiments conducted in situ using the serial dilution technique and pre-screening water on 64 pm showed that 33 to 4 2 % of the chl a biomass and 54 to > l o o % of phytoplankton production were consumed daily by protozooplankton. Thus, when predation was reduced, protozooplankton were able to control phytoplankton biomass and production. Predation by copepods, which showed high concentrations and were dominated by omnivorous Oithonidae during summer, may have played a central role in the seasonal changes in the size structure and biomass of protozooplankton. The observations and results from path analysis suggest the existence of 2 different food webs corresponding to bloom and summer conditions, respectively.

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Section: Protozooplankton Abundance and Biomassmentioning

confidence: 99%

Grazing by protists and seasonal changes in the size structure of protozooplankton and phytoplankton in a temperate nearshore environment (western Gulf of St. Lawrence, Canada)

Tamigneaux¹,

Mingelbier²,

Klein³

et al. 1997

Mar. Ecol. Prog. Ser.

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“…Azam et al 1983). In the Baltic Sea, as in most marine and brackish water environments, the planktonic microprotist community is dominated by ciliates and heterotrophic dinoflagellates (Beers et al 1980, Smetacek 1981, Andersen & Sørensen 1986, Kivi 1986, Sherr et al 1986, Hansen 1991, Pierce & Turner 1992, Bralewska & Witek 1995, Tiselius & Kuylenstierna 1996, Witek 1998. For the Baltic Sea, the basic outline of the annual cycle of the microprotist community with a biomass peak in spring and another in autumn has been described (Kivi 1986), and it involves changes in the species composition during the succession.…”

Section: Introductionmentioning

confidence: 99%

Planktonic ciliates in the Baltic Sea in summer: distribution, species association and estimated grazing impact

Setälä¹,

Kivi²

2003

Aquat. Microb. Ecol.

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“…The heterotrophic dinoflagellate Protoperidinium bipes is often abundant (reported maximum density = 137 cells ml -1 ) in coastal waters when Skeletonema costatum is abundant (Jeong et al 2000, Balkis 2003, Roberts et al 2003. It has a wide distribution (Lessard & Swift 1986, Jacobson 1987, Nielsen et al 1993, Bralewska & Witek 1995, Tiselius & Kuylendstierna 1996, Caroppo 2000, Tuschling et al 2000, Johnson & Costello 2002, Lovejoy et al 2002, Roberts et al 2003, but its feeding habit is as yet unknown.…”

Section: Introductionmentioning

confidence: 99%

Feeding by the heterotrophic dinoflagellate Protoperidinium bipes on the diatom Skeletonema costatum

Jeong¹,

Yoo²,

Kim³

et al. 2004

Aquat. Microb. Ecol.

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The heterotrophic dinoflagellate Protoperidinium bipes is a predominant heterotrophic dinoflagellate (maximum density = 137 cells ml -1 ) during diatom blooms. To investigate its role as a grazer in the population dynamics of diatoms, we measured growth and ingestion rates of P. bipes when feeding on the common diatom Skeletonema costatum. We also calculated grazing coefficients by combining field data on abundances of P. bipes and co-occurring S. costatum with laboratory data on ingestion rates obtained in the present study. Specific growth rates of P. bipes increased continuously with increasing concentration of S. costatum. The maximum specific growth rate of P. bipes on S. costatum was 1.37 d -1 when data for the growth rate were fitted to a Michaelis-Menten equation. The threshold prey concentration (where net growth = 0) was 111 ng C ml -1 (4270 cells ml ). The results of the present study suggest that P. bipes sometimes has a considerable grazing impact on populations of S. costatum.

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Heterotrophic dinoflagellates in the ecosystem of the Gulf of Gdansk

Cited by 36 publications

References 12 publications

Grazing by protists and seasonal changes in the size structure of protozooplankton and phytoplankton in a temperate nearshore environment (western Gulf of St. Lawrence, Canada)

Grazing by protists and seasonal changes in the size structure of protozooplankton and phytoplankton in a temperate nearshore environment (western Gulf of St. Lawrence, Canada)

Planktonic ciliates in the Baltic Sea in summer: distribution, species association and estimated grazing impact

Feeding by the heterotrophic dinoflagellate Protoperidinium bipes on the diatom Skeletonema costatum

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