Seasonal and annual variation in phaeocystis pouchetii (haptophyceae) in the westernmost inlet of the Wadden Sea during the 1973 to 1985 period

Cadée, Gerhard C.; Hegeman, J.

doi:10.1016/0077-7579(86)90058-x

Cited by 167 publications

(62 citation statements)

References 16 publications

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“…and N. transitans) co-occurring with P. globosa in April; and (ii) large fine-walled species (.200 mm; G. striata and R. imbricata) in May and July (Table 4; Figure 5). Similar patterns of diatom succession have been previously reported at the seasonal scale in the eastern English Channel (Breton et al, 2000;Seuront et al, 2006) and the coastal waters of the North Sea (Gieskes & Kraay, 1975;Cadée & Hegeman, 1986;Rousseau et al, 2000Rousseau et al, , 2002Tungaraza et al, 2003;Stelfox-Widdicombe et al, 2004;Muylaert et al, 2006). The key feature of these two consecutive diatom assemblages relies on their different nutrient conditions (Table 2) and the related potential nutrient limitation (Figure 3).…”

Section: Discussionsupporting

confidence: 81%

Temporal patterns of phytoplankton assemblages, size spectra and diversity during the wane of aPhaeocystis globosaspring bloom in hydrologically contrasted coastal waters

et al. 2008

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The space-time dynamic of phytoplankton diversity and succession was investigated during the wane of a Phaeocystis globosa spring bloom in four distinct hydrological sub-systems of the eastern English Channel. Nutrients, chlorophyll-a concentrations, and phytoplankton composition, standing stocks, size spectra and diversity were monitored during three key periods in 2003: late spring, early summer and summer. Two consecutive diatom assemblages were observed, respectively dominated by: (i) small colonial species (,100 mm; Melosira sp., Diploneis sp. and Navicula transitans) in April; and (ii) large fine-walled cells (.200 mm; Guinardia striata and Rhizosolenia imbricata) in May and July. This shift in diatom composition appeared to be related to the potentially limitating silicic acid in early summer. Specific phytoplankton assemblages identified in distinct water masses have evolved from a mature/senescent community towards a relatively homogeneous aestival structure of dominant species that might have been triggered by the wane of the P. globosa bloom. Our results also identified a strong heterogeneity in the distribution of secondary species between distinct water masses during the summer period, suggesting that the magnitude of the observed patterns was intrinsically related to the hydrological properties prevailing in each sub-system. The identification of distinct temporal patterns in phytoplankton species diversity and succession following the wane of a spring bloom at relatively small spatial scales (i.e. ,10 km) is discussed in the framework of P. globosa blooms in particular and phytoplankton blooms in general and is suggested to have potentially strong consequences on food web dynamics and the carbon cycle in coastal ecosystems.

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Section: Discussionsupporting

confidence: 81%

Temporal patterns of phytoplankton assemblages, size spectra and diversity during the wane of aPhaeocystis globosaspring bloom in hydrologically contrasted coastal waters

et al. 2008

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“…Phaeocystis cells also increased in number, but this did not result in the bloom of Phaeocysfisnormally occurring at this time of the year (Cadee & Hegeman 1986, van Boekel et al 1992. Relatively low temperatures (6 to 8°C) during this period may have led to low Phaeocystis growth rates (Kayser 1970, Grimm & Weisse 1985.…”

Section: Transition Periodmentioning

confidence: 88%

Effects of grazing, sedimentation and phytoplankton cell lysis on the structure of a coastal pelagic food web

Brussaard¹,

Riegman²,

Noordeloos³

et al. 1995

Mar. Ecol. Prog. Ser.

211

146

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The influence of grazing, sedimentation and phytoplankton cell lysis on the dynamics of a coastal pelagic ecosystem in the Southern Bight of the North Sea was studied during spring/summer 1992. Diatoms in the > 8 pm size fraction dominated during early spring, due to size-differential control by microzooplankton. This diatom spring bloom became silicate depleted and declined by sedimentation. A Phaeocystis bloom developed in early summer. Phytoplankton cell lysis was the major loss factor for Phaeocystjs, accounting for 75% of the decline of the bloom. Bacterial production was positively correlated with phytoplankton cell lysis, and bacterial carbon demand could be supplied by cell lysis. This illustrates the importance of phytoplankton cell lysis in providing energy for the microbial loop. A new method (nicotine addit~on technique) was used to estimate mesozooplankton grazing on microzooplankton. h4esozooplankton appeared to prefer microzooplankton as a food source, though there occasionally was substantial grazing on phytoplankton. We conclude that grazing and sedimentation, as well as call lysis, are structuring mechanisms for algal bloom dynamics.

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“…In the Southern Bight of the North Sea, Phaeocystis spring blooms have increased in intensity and duration during the past 3 decades (e.g. Cadee & Hegeman 1986). This trend coincides with increased riverine nutrient inputs (Lancelot et al 1987) and a shift in nutrient composition .…”

Section: Introductionmentioning

confidence: 94%

Phaeocystis blooming enhanced by copepod predation on protozoa: evidence from incubation experiments

Hansen¹,

Reckermann²,

Breteler³

et al. 1993

Mar. Ecol. Prog. Ser.

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Laboratory experiments were carried out to investigate the effect of protozoan, copepod and comb~ned grazing on Phaeocystis biomass. Phaeocystis cf. globosa single cells were offered to 3 different protozoan species, to the calanoid copepod Temora longicornis, as well as to mixtures of both grazer types. The heterotrophic dinoflagellate Oxyrrhis marina and the oligotrich clhate Strombidinopsjs acuminatum ingested Phaeocystis at much higher rates than did the copepod Nevertheless, protozoan growth and ingestion rates were submaximal, indicating Phaeocyst~s to be subopt~mal food. The ohgotrich ciliate Strombidium elegans did not feed on Phaeocystis. In grazing experiments w~t h mixtures of both predator types, the decline of Phaeocystis single cells could be explained by protozoan grazing alone, implying no grazing by the copepods on Phaeocystis. Instead, copepods ingested the protozoans at high rates. Predation on 0. marina and S. acuminatum by T. longicornis resulted in a reduct~on of the total grazing pressure on Phaeocystis of 21 and 67 % respectively. We conclude that mesozooplankton predation on herbivorous ciliates and heterotrophic dinoflagellates, which consumed Phaeocystis cells, can considerably reduce the overall grazing pressure and may enhance Phaeocystis bloomng.

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Seasonal and annual variation in phaeocystis pouchetii (haptophyceae) in the westernmost inlet of the Wadden Sea during the 1973 to 1985 period

Cited by 167 publications

References 16 publications

Temporal patterns of phytoplankton assemblages, size spectra and diversity during the wane of aPhaeocystis globosaspring bloom in hydrologically contrasted coastal waters

Temporal patterns of phytoplankton assemblages, size spectra and diversity during the wane of aPhaeocystis globosaspring bloom in hydrologically contrasted coastal waters

Effects of grazing, sedimentation and phytoplankton cell lysis on the structure of a coastal pelagic food web

Phaeocystis blooming enhanced by copepod predation on protozoa: evidence from incubation experiments

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