Mesozooplankton grazing during the Phaeocystis globosa bloom in the southern bight of the North Sea

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

doi:10.1016/s1385-1101(00)00016-2

Cited by 56 publications

(41 citation statements)

References 39 publications

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“…Although likely not triggered by a single factor (Peperzak et al 1998), the transition of single cells to larger colonies is interpreted as a mechanism by which Phaeocystis reduces large grazing losses by protozooplankton grazing (e.g., Weisse et al 1994;Verity 2000), a hypothesis recently supported by the observation of an enlargement of colony size in the presence of protist grazers or a chemical signal produced by potential grazers (Jakobsen and Tang 2002;Tang 2003). In contrast to single cells, colonies suffer only little grazing loss to the zooplankton community in temperate ecosystems (Bautista et al 1992;Gasparini et al 2000). Only small-sized colonies were found to be ingested by Acartia tonsa (Verity 2000).…”

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confidence: 99%

Trophic significance of solitary cells of the prymnesiophyte Phaeocystis globosa depends on cell type

Dutz

Koski

2006

Limnol. Oceanogr.

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With the use of five different isolates of Phaeocystis globosa solitary cells from the North Sea, we conducted experiments to reveal whether grazing and development of the nauplii of the calanoid copepod Temora longicornis varies in response to the cell type. Two P. globosa strains representing nonflagellated cells were ingested at intermediate to high rates and resulted in high survival and development, comparable to the Rhodomonas sp. control. In contrast, the response to three mesoflagellate strains was highly variable. Feeding on two of these strains was avoided, whereas the third strain was ingested; however, the mesoflagellates induced poor survival and development regardless of the feeding response. These observations differ from previous results, which generally demonstrate microzooplankton feeding on Phaeocystis. The morphological characterization of strains, together with mixture experiments, revealed that neither the production of transparent exopolymer particles and chitinous threads nor toxicity can explain the observed response. The cohesion of the threads into pentagonal stars was observed only in the avoided mesoflagellate and might cause a mechanical hindrance for the ingestion of mesoflagellates. Our results suggest that grazing loss and trophic transfer efficiency might be overestimated when solitary cells are treated as a single functional group with regard to their trophic position.

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confidence: 99%

Trophic significance of solitary cells of the prymnesiophyte Phaeocystis globosa depends on cell type

Dutz

Koski

2006

Limnol. Oceanogr.

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“…blooms, showing preferential feeding strategies towards more palatable and nutritious prey sources (e.g. Gasparini et al, 2000;Rousseau et al, 2000;Verity, 2000). Additionally, carbohydrates excreted by Phaeocystis spp.…”

Section: Discussionmentioning

confidence: 99%

Effects of elevated CO2 on phytoplankton community biomass and species composition during a spring Phaeocystis spp. bloom in the western English Channel

et al. 2017

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A 21-year time series of phytoplankton community structure was analysed in relation to Phaeocystis spp. to elucidate its contribution to the annual carbon budget at station L4 in the western English Channel (WEC).Between 1993-2014 Phaeocystis spp. contributed $4.6% of the annual phytoplankton carbon and during the March À May spring bloom, the mean Phaeocystis spp. biomass constituted 17% with a maximal contribution of 47% in 2001. Upper maximal weekly values above the time series mean ranged from 63 to 82% of the total phytoplankton carbon ($42-137 mg carbon (C) m À3 ) with significant interannual variability in Phaeocystis spp. Maximal biomass usually occurred by the end of April, although in some cases as early as mid-April (2007) and as late as late May (2013).The effects of elevated pCO 2 on the Phaeocystis spp. spring bloom were investigated during a fifteenday semi-continuous microcosm experiment. The phytoplankton community biomass was estimated at $160 mg C m À3 and was dominated by nanophytoplankton (40%, excluding Phaeocystis spp.), Phaeocystis spp. (30%) and cryptophytes (12%). The smaller fraction of the community biomass comprised picophytoplankton (9%), coccolithophores (3%), Synechococcus (3%), dinoflagellates (1.5%), ciliates (1%) and diatoms (0.5%). Over the experimental period, total biomass increased significantly by 90% to $305 mg C m À3 in the high CO 2 treatment while the ambient pCO 2 control showed no net gains. Phaeocystis spp. exhibited the greatest response to the high CO 2 treatment, increasing by 330%, from $50 mg C m À3 to over 200 mg C m À3 and contributing $70% of the total biomass.Taken together, the results of our microcosm experiment and analysis of the time series suggest that a future high CO 2 scenario may favour dominance of Phaeocystis spp. during the spring bloom. This has significant implications for the formation of hypoxic zones and the alteration of food web structure including inhibitory feeding effects and lowered fecundity in many copepod species.Crown

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“…Omnivorous feeding has been reported for the other species of Acartia, Temora and Centropages from different areas. They feed on phytoplankton (mostly diatoms), dinoflagellates and microzooplankton (Hansen et al 1993;Dam et al 1994;Kleppel et al 1996;Gasparini et al 2000;Roman et al 2006;Kozlowsky-Suzuki et al 2006). Some species of Acartia genus (A. clausi, A. grani, A. tonsa) are described as herbivorous (Anraku and Omori 1963;Kleppel et al 1991;Gasparini et al 2000), but for A. bifilosa an omnivorous feeding was proposed by Irigoien and Castel (1995).…”

Section: Discussionmentioning

confidence: 99%

“…-1 day -1 , Acartia bifilosa, A. tonsa, Temora longicornis, Centropages chierchiae; see: Irigoien and Castel 1995;Gasparini et al 2000;Vincent and Hartmann 2001). The gut evacuation time varied from 18 to 60 min and fell within the wide range of 23.8-545 min reported for copepods from similar genera (see reviews: Corner et al 1986;Mauchline 1998).…”

Section: Discussionmentioning

confidence: 99%

Seasonal abundance and feeding patterns of copepods Temora longicornis, Centropages hamatus and Acartia spp. in the White Sea (66°N)

et al. 2011

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We have studied the seasonal dynamics of abundance and feeding characteristics of three species of calanoid copepods (Acartia spp., Centropages hamatus and Temora longicornis) in the White Sea from the surface water layer (0-10 m), in order to assess their role in the pelagic food web and to determine the major factors governing their population dynamics during the productive season. These species dominated in the upper water layer (0-10 m) from June through September, producing up to 3 generations per year. Data on the food spectra revealed all species to be omnivorous; but some inter-and intraspecific differences were observed. Generally, copepods consumed diatoms, dinoflagellates and microzooplankton. The omnivory index 'UC' (i.e., fatty acid unsaturation coefficient) varied from 0.2 to 0.6, which implied ingestion of phytoplankton. The different degree of selectivity on the same food items by the studied species was observed, and therefore, successful surviving strategy with minimal overlapping could be assumed. In total, the populations of the three studied copepod species grazed up to 2.15 g C m -2 day -1 and released up to 0.68 g C m -2 day -1 in faecal pellets. They consumed up to 50% of particulate organic carbon, or up to 85% of phytoplankton standing stock (in terms of Chl. a), and thus played a significant role in the transformation of particulate organic matter. Seasonal changes in abundance of the studied species depended mostly on water temperature in the early summer, but were also affected by food availability (Chl. a concentration) during the productive season.

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Mesozooplankton grazing during the Phaeocystis globosa bloom in the southern bight of the North Sea

Cited by 56 publications

References 39 publications

Trophic significance of solitary cells of the prymnesiophyte Phaeocystis globosa depends on cell type

Trophic significance of solitary cells of the prymnesiophyte Phaeocystis globosa depends on cell type

Effects of elevated CO2 on phytoplankton community biomass and species composition during a spring Phaeocystis spp. bloom in the western English Channel

Seasonal abundance and feeding patterns of copepods Temora longicornis, Centropages hamatus and Acartia spp. in the White Sea (66°N)

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