Nanoplankton protists from the western Mediterranean Sea. I. Occurrence, ultrastructure, taxonomy and ecological role of the mixotrophic flagellate &lt;i&gt;Ollicola vangoorii&lt;/i&gt; (Chrysomonadidae = Chrysophyceae p.p.)

Novarino, Gianfranco; Oliva, Emilia; Pérez-Uz, Blanca

doi:10.3989/scimar.2002.66n3233

Cited by 9 publications

(5 citation statements)

References 39 publications

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“…In inoculums, the species diversity of the phytoplankton communities expressed as H index was significantly lower in lagoon (1.25 ± 0.05 bits ind -1 ) than in offshore station (1.45 ± 0.006 bits ind -1 ). In station L, the phytoplankton inoculum (0.85 6 cells l -1 ) was dominated by chrysophyceae (0.38 6 cells l -1 ), the most abundant species being the loricate chromulinale Ollicola vangoorii (known as mixotrophic in Mediterranean waters, Novarino et al 2002) and an unidentified chrysophyceae (50% of total cell counts). The phytoplankton community contained similar proportions (~25%) of dinoflagellates (0.21 10 6 cells l -1 ) and small unidentified flagellates (0.23 10 6 cells l -1 ) (Fig.…”

Section: Effects Of the Treatments On Phytoplankton Abundance And Whomentioning

confidence: 99%

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

Othman

Pringault

Louati

et al. 2017

Journal of Experimental Marine Biology and Ecology

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Effects of sediment-released contaminants and nitrogen were assessed on phytoplankton communities sampled from Thau lagoon (France, Mediterranean Sea) and one close offshore marine station. Phytoplankton was exposed to sediment elutriate (seawater containing a mix of metals, organic chemicals, and nutrients) or to ammonium enrichment for four days using immersed microcosms exposed to natural conditions of light and temperature. Functional (production-respiration balance) and structural (taxonomy and cell densities) responses of the phytoplankton community were assessed. In the lagoon, both treatments stimulated phytoplankton growth, compare to controls. Conversely in the offshore station, the phytoplankton growth was stimulated only with the sediment elutriate addition. In offshore and lagoon stations, both treatments caused a shift in the taxonomic composition of the phytoplankton. Proliferation of potentially toxic diatoms and dinoflagellates resulted from the addition of elutriate. Correspondence analysis determined that phytoplankton from the offshore station was more sensitive to both treatments compared to the lagoon community. According to daily production and respiration balance, lagoon community metabolism remained heterotrophic (P < R) for all treatments, whereas only transient shifts to net autotrophy (P > R) were observed in the offshore community. Direct toxicity of contaminants released from sediment, if any, was therefore masked by nutrient enrichment effects, whereas indirect evidence of contaminant pressure was highlighted by changes in community composition and metabolism. Highlights ► Contaminated sediment elutriates trigger changes in phytoplankton dynamics. ► Phytoplankton community structure and metabolism are affected. ► Elutriates effects are not identical to those of nutrient addition alone. ► Elutriates effects differ depending on the initial community structure.

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Section: Effects Of the Treatments On Phytoplankton Abundance And Whomentioning

confidence: 99%

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

Othman

Pringault

Louati

et al. 2017

Journal of Experimental Marine Biology and Ecology

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“…However, because these cells are only known from field observations, mostly by SEM (Bravo‐Sierra & Hernandez‐Becerril, 2003), and have never been isolated in culture, their exact taxonomic affiliation remains mysterious, although they have been provisionally classified into the Chrysophyceae. The mixotrophic species Ollicolla vangoorii is another marine Chrysophyceae that possesses a lorica and that has been reported from temperate and polar waters (see Novarino et al , 2002 and references therein).…”

Section: Described Species Of Small Eukaryotic Marine Phytoplanktonmentioning

confidence: 99%

The diversity of small eukaryotic phytoplankton (≤3 μm) in marine ecosystems

et al. 2008

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Small cells dominate photosynthetic biomass and primary production in many marine ecosystems. Traditionally, picoplankton refers to cells < or =2 microm. Here we extend the size range of the organisms considered to 3 microm, a threshold often used operationally in field studies. While the prokaryotic component of picophytoplankton is dominated by two genera, Prochlorococcus and Synechococcus, the eukaryotic fraction is much more diverse. Since the discovery of the ubiquitous Micromonas pusilla in the early 1950s, just over 70 species that can be <3 microm have been described. In fact, most algal classes contain such species. Less than a decade ago, culture-independent approaches (in particular, cloning and sequencing, denaturing gradient gel electrophoresis, FISH) have demonstrated that the diversity of eukaryotic picoplankton is much more extensive than could be assumed from described taxa alone. These approaches revealed the importance of certain classes such as the Prasinophyceae but also unearthed novel divisions such as the recently described picobiliphytes. In the last couple of years, the first genomes of photosynthetic picoplankton have become available, providing key information on their physiological capabilities. In this paper, we discuss the range of methods that can be used to assess small phytoplankton diversity, present the species described to date, review the existing molecular data obtained on field populations, and end up by looking at the promises offered by genomics.

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“…For SEM, 10 mL of the exponentially growing culture was fixed and left to settle overnight at room temperature on a coverslip previously treated with polylysine. Then the coverslip was processed as in Novarino et al. (2002) and eventually observed at 5 kV under a field‐emission scanning electron microscope Philips X30.…”

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URGORRI COMPLANATUSGEN. ET SP. NOV. (CRYPTOPHYCEAE), A RED‐TIDE‐FORMING SPECIES IN BRACKISH WATERS¹

Laza‐Martínez

2012

Journal of Phycology

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The morphology, ultrastructure, phylogeny, and ecology of a new red-tide-forming cryptomonad, Urgorri complanatus Laza-Martínez gen. et sp. nov., is described. U. complanatus has been collected in southwestern European estuaries, blooming in the inner reaches of several of them. The estuarine character of the species is also supported by its in vitro salinity preferences, showing a maximum growth rate at 10 psu. U. complanatus is a distinctive species and can be easily distinguished by LM from other known brackish and marine species. Cells are dorsoventrally flattened. The plastid has two anterior lobes. One pyrenoid is located in each of the lobes, and a third one on the posterior part. Thylakoids are arranged in pairs and do not penetrate pyrenoids. The plastid is reddish due to the presence of the phycoerythrin Cr-PE545. An orange discoidal eyespot lies beneath the nucleus, in the posterior ventral face of the plastid. A long furrow runs from the vestibulum, and a gullet is lacking. The periplast is composed of an inner sheet. The nuclear 18S rDNA based molecular analysis reveals U. complanatus is not related to any of the main cryptomonad lineages. Based on ultrastructural and pigment data, the most probable relatives are those merged under the family Geminigeraceae. Its lack of derived characters, together with the presence of characters proposed in previous studies to be primitive, suggests Urgorri could be considered representative of the cryptophycean ancestral character state.

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Nanoplankton protists from the western Mediterranean Sea. I. Occurrence, ultrastructure, taxonomy and ecological role of the mixotrophic flagellate <i>Ollicola vangoorii</i> (Chrysomonadidae = Chrysophyceae p.p.)

Cited by 9 publications

References 39 publications

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

The diversity of small eukaryotic phytoplankton (≤3 μm) in marine ecosystems

URGORRI COMPLANATUSGEN. ET SP. NOV. (CRYPTOPHYCEAE), A RED‐TIDE‐FORMING SPECIES IN BRACKISH WATERS¹

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Nanoplankton protists from the western Mediterranean Sea. I. Occurrence, ultrastructure, taxonomy and ecological role of the mixotrophic flagellate <i>Ollicola vangoorii</i> (Chrysomonadidae = Chrysophyceae p.p.)

Cited by 9 publications

References 39 publications

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France)

The diversity of small eukaryotic phytoplankton (≤3 μm) in marine ecosystems

URGORRI COMPLANATUSGEN. ET SP. NOV. (CRYPTOPHYCEAE), A RED‐TIDE‐FORMING SPECIES IN BRACKISH WATERS1

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URGORRI COMPLANATUSGEN. ET SP. NOV. (CRYPTOPHYCEAE), A RED‐TIDE‐FORMING SPECIES IN BRACKISH WATERS¹