Trophic efficiency of the planktonic food web in a coastal ecosystem dominated by Phaeocystis colonies

Rousseau, Véronique; Becquevort, Sylvie; Parent, Jean-Yves; Gasparini, Stéphane; Daro, M.H.; Tackx, M.; Lancelot, Christiane

doi:10.1016/s1385-1101(00)00018-6

Cited by 86 publications

(63 citation statements)

References 44 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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“…Because Phaeocystis solitary cells are more readily consumed by grazers relative to colonies ), our results suggest that P. globosa might experience increased grazing pressure at higher temperature, and combined with the near-0 sinking rates of solitary cells, could result in a reduced Phaeocystis carbon flux to the sediments (Hamm & Rousseau 2003, Reigstad & Wassmann 2007 and increased POC retention within the pelagic food web (Hamm 2000). Reduced colony formation at higher temperature would also reduce the amount of mucilage production and bacterial activities that are supported by it (Becquevort et al 1998, Rousseau et al 2000.…”

Section: Solitary Vs Colonial Formsmentioning

confidence: 81%

Temperature effects on growth, colony development and carbon partitioning in three Phaeocystis species

Wang¹,

Tang²,

Wang³

et al. 2010

Aquat. Biol.

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ABSTRACT:Phaeocystis is an ecologically important marine phytoplankton genus that is globally distributed. We examined the effects of temperature on the 3 most common species: P. globosa, P. antarctica, and P. pouchetii, which grew at 16-32, 0-6, and 4-8°C, respectively. P. pouchetii did not form colonies; P. globosa formed colonies at 16, 20, and 24°C, and P. antarctica colonies were observed at all temperatures. More cells were partitioned into the colonial form at lower temperatures than at higher temperatures for P. globosa and P. antarctica. P. globosa colony size decreased with temperature, whereas P. antarctica colony size showed no distinct response to temperature. Numbers of cells per unit of colony surface area of P. globosa and P. antarctica were lowest at temperatures where highest growth rates and colonial abundances were observed; more organic carbon was partitioned into solitary cell biomass at higher temperatures, whereas the carbon concentration of colonies was not affected by temperature. Maximum quantum yield of P. antarctica and P. globosa exhibited subtle responses to temperature, whereas that of P. pouchetii was relatively invariant within the growth temperature range. Future changes in sea surface temperature may dramatically alter the ecology and biogeochemical cycles of systems dominated by Phaeocystis spp. and result in further degradation, via oxygen depletion and altered food web structure. KEY WORDS: Phaeocystis spp. · Temperature · Colony formation · Carbon partitioningResale or republication not permitted without written consent of the publisher

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“…In the Belgian Coastal Zone (BCZ) of the North Sea, the phytoplankton succession is characterized by a first diatom bloom in late February-early March, followed by a huge biomass peak of Phaeocystis globosa in April-May before summer and autumn diatom blooms (Lancelot et al, 2005) The prymnesiophyte Phaeocystis globosa (referred hereafter as Phaeocystis) forms extensive blooms representing 95% of the phytoplankton spring community biomass (Rousseau et al, 1990(Rousseau et al, , 2000 and their colonies are estimated as responsible for around 80% of the total annual DMSP production in this zone . The area is a permanently well-mixed and eutrophied coastal zone under the influence of the Scheldt and the Rhine rivers.…”

Section: Introductionmentioning

confidence: 99%

Annual cycle of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) related to phytoplankton succession in the Southern North Sea

Speeckaert

Borges

Champenois

et al. 2018

Science of The Total Environment

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The influence of abiotic and biotic variables on the concentration of dimethyl sulfide (DMS), dimethylsulfoniopropionate (DMSP), and dimethylsulfoxide (DMSO), were investigated during an annual cycle in 2016 in the Belgian Coastal Zone (BCZ, North Sea). We reported strong seasonal variations in the concentration of these compounds linked to the phytoplankton succession with high DMS(P,O) producers (mainly Phaeocystis globosa) occurring in spring and low DMS(P,O) producers (various diatoms species) occurring in early spring and autumn. Spatial gradients of DMS and DMSP were related to those of phytoplankton biomass itself related to the inputs of nutrients from the Scheldt estuary. However, the use of a relationship with Chlorophyll-a (Chl-a) concentration is not sufficient to predict DMSP. Accounting for the phytoplankton composition, two different DMSP versus Chl-a correlations could be established, one for diatoms and another one for Phaeocystis colonies. We also reported high nearshore DMSO concentrations uncoupled to Chl-a and DMSP concentrations but linked to high suspended particulate matter (SPM) presumably coming from the Scheldt estuary as indicated by the positive relationship between annual average SPM and salinity.

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Trophic efficiency of the planktonic food web in a coastal ecosystem dominated by Phaeocystis colonies

Cited by 86 publications

References 44 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

Temperature effects on growth, colony development and carbon partitioning in three Phaeocystis species

Annual cycle of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) related to phytoplankton succession in the Southern North Sea

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