@article {Baudoux2015, title = {Interplay between the genetic clades of {\textexclamdown}i{\textquestiondown}Micromonas{\textexclamdown}/i{\textquestiondown} and their viruses in the Western English Channel.}, journal = {Environmental microbiology reports}, year = {2015}, note = {tex.mendeley-tags: 2015,rcc,sbr?hyto$_\textrmd$ipo}, month = {jun}, abstract = {The genus Micromonas comprises distinct genetic clades that commonly dominate eukaryotic phytoplankton community from polar to tropical waters. This phytoplankter is also recurrently infected by abundant and genetically diverse prasinoviruses. Here we report on the interplay between prasinoviruses and Micromonas with regards to the genetic diversity of this host. During one year, we monitored the abundance of 3 clades of Micromonas and their viruses in the Western English Channel both in the environment, using clade-specific probes and flow cytometry, and in the laboratory, using clonal strains of Micromonas clades to assay for their viruses by plaque-forming units. We showed that the seasonal fluctuations of Micromonas clades were closely mirrored by the abundances of their corresponding viruses, indicating that the members of Micromonas genus are susceptible to viral infection, regardless of their genetic affiliation. The characterization of 45 viral isolates revealed that Micromonas clades are attacked by specific virus populations, which exhibit distinctive clade specificity, life strategies, and genetic diversity. However, some viruses can also cross-infect different host clades suggesting a mechanism of horizontal gene transfer within Micromonas genus. This study provides novel insights into the impact of viral infection for the ecology and evolution of the prominent phytoplankter Micromonas.}, keywords = {2015, rcc, RCC?o?dd, sbr?hyto$_\textrmd$ipo}, issn = {1758-2229}, doi = {10.1111/1758-2229.12309}, url = {http://www.ncbi.nlm.nih.gov/pubmed/26081716}, author = {Baudoux, A-C and Lebredonchel, H and Dehmer, H and Latimier, M and Edern, R and Rigaut-Jalabert, F and Ge, P and Guillou, L and Foulon, E and Bozec, Y and Cariou, T and Desdevises, Y and Derelle, E and Grimsley, N and Moreau, H and Simon, N} } @article {Lepelletier2014, title = {Parvilucifera rostrata sp. nov., a novel parasite in the phylum Perkinsozoa that infects the toxic dinoflagellate Alexandrium minutum (Dinophyceae)}, journal = {Protist}, volume = {165}, year = {2014}, note = {tex.mendeley-tags: 2014,macumba,rcc,sbr?hyto$_\textrmd$ipo,sbr?hyto?app}, pages = {31{\textendash}49}, keywords = {2014, MACUMBA, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, SBR$_\textrmP$hyto$_\textrmP$PM, sbr?hyto$_\textrmd$ipo, sbr?hyto?app}, doi = {10.1016/j.protis.2013.09.005}, author = {Lepelletier, F and Karpov, S A and Le Panse, S and Bigeard, E and Skovgaard, A and Jeanthon, C and Guillou, L} } @article {Dia2014, title = {Spatiotemporal changes in the genetic diversity of harmful algal blooms caused by the toxic dinoflagellate Alexandrium minutum}, journal = {Molecular Ecology}, volume = {23}, number = {3}, year = {2014}, note = {tex.mendeley-tags: 2014,macumba,rcc,sbr?hyto$_\textrmd$ipo}, pages = {549{\textendash}560}, abstract = {Organisms with sexual and asexual reproductive systems benefit from both types of reproduction. Sexual recombination generates new combinations of alleles, whereas clonality favours the spread of the fittest genotype through the entire population. Therefore, the rate of sexual vs. clonal reproduction has a major influence on the demography and genetic structure of natural populations. We addressed the effect of reproductive system on populations of the dinoflagellate Alexandrium minutum. More specifically, we monitored the spatiotemporal genetic diversity during and between bloom events in two estuaries separated by 150 km for two consecutive years. An analysis of population genetic patterns using microsatellite markers revealed surprisingly high genotypic and genetic diversity. Moreover, there was significant spatial and temporal genetic differentiation during and between bloom events. Our results demonstrate that (i) interannual genetic differentiation can be very high, (ii) estuaries are partially isolated during bloom events and (iii) genetic diversity can change rapidly during a bloom event. This rapid genetic change may reflect selective effects that are nevertheless not strong enough to reduce allelic diversity. Thus, sexual reproduction and/or migration may regularly erase any genetic structure produced within estuaries during a bloom event.}, keywords = {2014, bloom dynamics, clonality, linkage disequilibrium, MACUMBA, population genetics, rcc, RCC?o?dd, resting cyst, SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto$_\textrmd$ipo, sexual reproduction}, doi = {10.1111/mec.12617}, url = {http://dx.doi.org/10.1111/mec.12617}, author = {Dia, A and Guillou, L and Mauger, S and Bigeard, E and Marie, D and Valero, M and Destombe, C} } @article {Guillou2011, title = {Characterization of the Parmales: much more than the resolution of a taxonomic enigma}, journal = {Journal of Phycology}, volume = {47}, year = {2011}, note = {tex.mendeley-tags: 2011,rcc,sbr?hyto$_\textrmd$ipo}, pages = {2{\textendash}4}, keywords = {2011, rcc, SBR$_\textrmP$hyto, sbr?hyto$_\textrmd$ipo}, doi = {10.1111/j.1529-8817.2010.00951.x}, author = {Guillou, L} } @article {Rodriguez2008, title = {Phylogenetic and morphological characterization of the green algae infesting blue mussel Mytilus edulis in the North and South Atlantic}, journal = {Diseases of Aquatic Organisms}, volume = {81}, year = {2008}, note = {tex.mendeley-tags: RCC894}, pages = {231{\textendash}240}, keywords = {rcc, RCC894, SBR$_\textrmP$hyto$_\textrmD$PO}, doi = {10.3354/dao01956}, author = {Rodriguez, F and Feist, S W and Guillou, L and Harkestad, L S and Bateman, K and Renault, T and Mortensen, S} } @article {Rodriguez2005h, title = {Ecotype diversity in the marine picoeukaryote Ostreococcus (Chlorophyta, Prasinophyceae).}, journal = {Environmental Microbiology}, volume = {7}, year = {2005}, note = {tex.mendeley-tags: RCC113,RCC143,RCC343,RCC356,RCC371,RCC393,RCC410,RCC420,RCC434,RCC501,RCC658,RCC745,Rcc141}, pages = {853{\textendash}859}, keywords = {rcc, RCC113, Rcc141, RCC143, RCC343, RCC356, RCC371, RCC393, rcc410, RCC420, RCC434, rcc501, RCC658, RCC745, SBR$_\textrmP$hyto$_\textrmD$PO}, doi = {10.1111/j.1462-2920.2005.00758.x}, author = {Rodriguez, F and Derelle, E and Guillou, L and Le Gall, F and Vaulot, D and Moreau, H} } @article {Henley2004, title = {Phylogenetic analysis of the Nannochloris-like{\textquoteright} algae and diagnoses of Picochlorum oklahomensis gen. et sp nov (Trebouxiophyceae, Chlorophyta)}, journal = {Phycologia}, volume = {43}, number = {6}, year = {2004}, note = {tex.mendeley-tags: 2004,rcc,sbr?hyto}, pages = {641{\textendash}652}, abstract = {A broadly halotolerant new isolate of a small asexual coccoid chlorophyte and six new, related freshwater isolates provided the impetus for a phylogenetic analysis of the so-called {\textquoteright}Nannochloris-like{\textquoteright} algae within the Trebouxiophyceae. Previous taxonomic disagreements concerning this group had not been rigorously tested with molecular phylogenetic analyses. We show with 18S ribosomal DNA (rDNA) sequence phylogeny that 19 of 22 isolates previously assigned to either Nannochloris or Nanochlorum fall within a diverse sister clade to a clade including the four {\textquoteright}true{\textquoteright} Chlorella species sensu loto. In addition, Marvania geminata, Gloeotila contorta, Chlorella sp. Yanaqocha RA1, Koliella spiculiformis, {\textquoteright}Chlorella minutissima{\textquoteright} C-1.1.9. and new Koliella, Gloeotila and Marvania isolates were included in the Nannochloris-like clade. Distinct freshwater and marine or saline lineages comprise at least three major subclades, generally corresponding to cell division pattern. Seven of 14 marine or saline isolates are known (and the others presumed) to divide by autosporulation. Eight freshwater isolates divide by binary fission, including two Koliella, two Gloeotila, N. bacillaris, Chlorella sp. Yanaqocha RA1, and two new unassigned isolates. Four freshwater isolates divide by budding or autosporulation (three Marvania, including CCAP 251/1b. previously assigned to N. coccoides). The autosporic taxa N. eucaryotum UTEX 2502 (marine) and C. minutissima C-1.1.9 (freshwater), which have nearly identical 18S rDNA sequences, are deeper-branching than the freshwater and marine or saline lineages. We propose including the 13 marine or saline, autosporic taxa (excluding N. eucaryotum UTEX 2502) in the new genus Picochlorum until distinctive morphological or biochemical characters are identified that would indicate multiple genera corresponding to subclades. Such characters exist in the freshwater lineages, supporting retention of Koliella, Gloeotila, Marvania and Nannochloris as distinct genera, although each is currently represented by few isolates. Nannochloris at this time may be restricted to N. bacillaris and Chlorella sp. Yanaqocha RA1. We also describe halotolerant P. oklahomensis Hironaka sp. nov. Based on 18S rDNA sequence and lack of chlorophyll b, Nannochloris sp. UTEX 2379 should be reassigned to the Eustigmatophyceae.}, keywords = {18s-, 2004, Aquatic-sciences, cell-wall, chlorella-, green-alga, life-cycle, marvania-geminata, morphology-, Nanochlorum-eucaryotum, position-, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto, SEQUENCES}, doi = {10.2216/i0031-8884-43-6-641.1}, author = {Henley, W J and Hironaka, J L and Guillou, L and Buchheim, M A and Buchheim, J A and Fawley, M W and Fawley, K P} } @article {Vaulot2004, title = {The roscoff culture collection (RCC): a collection dedicated to marine picoplankton}, journal = {Nova Hedwigia}, volume = {79}, number = {1/2}, year = {2004}, note = {tex.mendeley-tags: 2004,rcc,sbr?hyto}, pages = {49{\textendash}70}, keywords = {10$_\textrmb$est, 2004, PICODIV, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto}, doi = {10.1127/0029-5035/2004/0079-0049}, author = {Vaulot, D and Le Gall, F and Marie, D and Guillou, L and Partensky, F} } @article {Guillou2001, title = {Grazing impact of two small heterotrophic flagellates on Prochlorococcus and Synechococcus}, journal = {Aquatic Microbial Ecology}, volume = {26}, number = {2}, year = {2001}, note = {tex.mendeley-tags: 2001,rcc,sbr?hyto}, pages = {201{\textendash}207}, abstract = {In open oceanic waters, phytoplankton biomass is dominated by organisms below 2 to 3 mum in size (pico- and small nanophytoplankton). The cell concentration of these populations is very stable in time and space as a consequence of nutrient limitation and strong grazing pressure, Although the identity of the organisms that directly graze on picoplankton is largely unknown, they are thought to be very small, i.e. {\textexclamdown}3 to 5 {\textexclamdown}mu{\textquestiondown}m, Here, we analyze the grazing impact of 2 small flagellates, Symbiomonas scintillans and Picophagus flagellatus, upon 2 oceanic cyanobacteria, Prochlorococcus and Synechococcus. S. scintillans does not feed on the 2 cyanobacteria. In contrast, P. flagellatus appears as an active predator capable of drastically reducing prey concentrations. The flagellate displays a substantial division rate of the order of 2 doublings d(-1) when fed on Prochlorococcus cells, but no significant growth is recorded when Synechococcus is used as prey. As the majority ({\textquestiondown} 80\%) of P. flagellatus cells can pass throughout a 2 mum filter, the impact of such tiny predators should be taken into consideration during field experiments that rely on size fractionation to separate grazers from prey.}, keywords = {2001, Algal Class, Equatorial Pacific, Growth Rates, Laboratory Cultures, Marine, Nanoplankton, PICODIV, picoplankton, Prey, rcc, SBR$_\textrmP$hyto, sbr?hyto, Size, Sp Nov}, doi = {10.3354/ame026201}, author = {Guillou, L and Jacquet, S and Chr{\'e}tiennot-Dinet, M.-J. and Vaulot, D} } @article {Guillou1999, title = {Bolidomonas: a new genus with two species belonging to a new algal class, the Bolidophyceae (Heterokonta)}, journal = {Journal of Phycology}, volume = {35}, year = {1999}, note = {tex.mendeley-tags: 1999,rcc,sbr?hyto}, pages = {368{\textendash}381}, abstract = {A new algal class, the Bolidophyceae (Heterokonta), is described from one genus, Bolidomonas, gen, nov., and two species, Bolidomonas pacifica, sp, nov and Bolidomonas mediterranea, sp, nov., isolated from the equatorial Pacific Ocean and the Mediterranean Sea, respectively. Both species are approximately 1.2 mu m in diameter and have two unequal flagella; the longer flagellum bears tubular hairs, whereas the shorter is smooth. The flagellar basal apparatus is restricted to two basal bodies, and there is no transitional helix. Cells are naked, devoid of walls or siliceous structures. The internal cellular organization is simple with a single plastid containing a ring genophore and a girdle lamella, one mitochondrion with tubular cristae, and one Golgi apparatus close to the basal bodies. The Mediterranean and the Pacific species differ in the insertion angle between their flagella and their pattern of swimming, these differences possibly being linked to each other. Analyses of the SSU rDNA gene place the two strains as a sister group to the diatoms, Moreover, pigment analyses confirm this position, as fucoxanthin is found as the major carotenoid in both lineages. These data strongly suggest that the ancestral heterokont that gave rise to the diatom lineage was probably a biflagellated unicell.}, keywords = {10$_\textrmb$est, 1999, Bolidophyceae, CELL-CYCLE, CHRYSOPHYCEAE, diatoms, DIVINYL-CHLOROPHYLL, FINE-STRUCTURE, FLAGELLAR APPARATUS, Heterokonta, Marine, marine picoeukaryotes, oligotrophic ocean, rcc, RNA, SBR$_\textrmP$hyto, sbr?hyto, SEQUENCE, sp-nov, stramenopiles, ultrastructure}, doi = {10.1046/j.1529-8817.1999.3520368.x}, author = {Guillou, L and Chr{\'e}tiennot-Dinet, M.-J. and Medlin, L K and Claustre, H and Loiseaux-de Go{\"e}r, S and Vaulot, D} } @article {Guillou1999a, title = {Diversity and abundance of Bolidophyceae (Heterokonta) in two oceanic regions}, journal = {Applied and Environmental Microbiology}, volume = {65}, number = {10}, year = {1999}, note = {ISBN: 0099-2240 Publisher: Amer Soc Microbiology tex.address: 1325 Massachusetts Avenue, NW, Washington, DC 20005-4171, USA tex.mendeley-tags: 1999,rcc,sbr?hyto}, pages = {4528{\textendash}4536}, abstract = {The diversity and abundance of the Bolidophyceae (Heterokonta), a newly described picoplanktonic algal class which is a sister group to the diatoms, was assessed in the equatorial Pacific Ocean and in the Mediterranean Sea by culture isolation, molecular biology techniques, and pigment analyses. Eight strains of Bolidophyceae were isolated in culture from different mesotrophic and oligotrophic areas. The corresponding small subunit (SSU) rRNA gene sequences allowed us to design two probes specific for the Bolidophyceae. These probes have been used in natural samples (i) to selectively amplify and detect Bolidophyceae sequences and (ii) to quantify the relative abundance of Bolidophyceae within the picoeukaryote community. Sequences available to date indicate that the class Bolidophyceae comprises at least three different clades, two corresponding to the previously described species Bolidomonas pacifica and Bolidomonas mediterranea and the third one corresponding to a subspecies of B. Pacifica. Amplification of the SSU rRNA gene from natural samples with universal primers and hybridization using a Bolidomonas-specific probe followed by a eukaryote-specific probe allowed us to estimate the contribution of the Bolidophyceae to the eukaryotic DNA in both Pacific and Mediterranean waters to be lower than 1\%. Similarly, high-performance liquid chromatography analyses of fucoxanthin, the major carotenoid present in Bolidophyceae, indicated that less than 4\% of the total chlorophyll a in the picoplanktonic fraction in the equatorial Pacific was due to Bolidophyceae. Consequently, although strains of Bolidophyceae have been isolated from samples collected at several stations, this new class seems to have been a minor component of the natural picoeukaryotic populations in the ecosystems investigated, at least during the periods sampled.}, keywords = {1999, ATLANTIC, BACTERIOPLANKTON, community structure, flow-cytometry, MOLECULAR PHYLOGENY, PACIFIC, phytoplankton, PIGMENT SIGNATURES, rcc, RNA GENE SEQUENCE, SBR$_\textrmP$hyto, sbr?hyto, ULTRAPHYTOPLANKTON}, doi = {10.1128/AEM.65.10.4528-4536.1999}, author = {Guillou, L and Moon-van der Staay, S Y and Claustre, H and Partensky, F and Vaulot, D} } @article {Guillou1999b, title = {Symbiomonas scintillans gen. et sp nov and Picophagus flagellatus gen. et sp nov (Heterokonta): Two new heterotrophic flagellates of picoplanktonic size}, journal = {Protist}, volume = {150}, number = {4}, year = {1999}, note = {ISBN: 1434-4610 Publisher: Urban \& Fischer Verlag tex.address: Branch Office Jena, P O Box No.100 537, D-07705 Jena, Germany tex.mendeley-tags: 1999,rcc,sbr?hyto}, pages = {383{\textendash}398}, abstract = {Two new oceanic free-living heterotrophic Heterokonta species with picoplanktonic size ({\textexclamdown} 2 mu m) are described, Symbiomonas scintillans Guillou et Chretiennot-Dinet gen. Ef sp. Nov, was isolated from samples collected both in the equatorial Pacific Ocean and the Mediterranean Sea. This new species possesses ultrastructural features of the bicosoecids, such as the absence of a helix in the flagellar transitional region (found in Cafeteria roenbergensis and in a few bicosoecids), and a flagellar root system very similar to that of C. Roenbergensis, Acronema sippewissettensis, and Bicosoeca maris. This new species is characterized by a single flagellum with mastigonemes, the presence of endosymbiotic bacteria located close to the nucleus, the absence of a lorica and a R3 root composed of a 6+3+x microtubular structure. Phylogenetical analyses of nuclear-encoded SSU rDNA gene sequences indicate that this species is close to the bicosoecids C. Roenbergensis and Siluania monomastiga. Picophagus flagellatus Guillou et Chretiennot-Dinet gen. Et sp. Nov. Was collected in the equatorial Pacific Ocean, Cells are naked and possess two flagella, This species is characterized by the lack of a transitional helix and lateral filaments on the flagellar tubular hairs, the absence of siliceous scales, two unequal flagella, R1 + R3 roots, and the absence of a rhizoplast. SSU rDNA analyses place this strain at the base of the Chrysophyceae/Synurophyceae lineages.}, keywords = {1999, APPARATUS, DEVELOPAYELLA-ELEGANS, EMPHASIS, MOLECULAR PHYLOGENY, picophytoplankton, PLASTIDS, rcc, RDNA, SBR$_\textrmP$hyto, sbr?hyto, SEQUENCES}, doi = {10.1016/S1434-4610(99)70040-4}, author = {Guillou, L and Chr{\'e}tiennot-Dinet, M.-J. and Boulben, S and Moon-van der Staay, S Y and Vaulot, D} } @article {Courties1998, title = {Phylogenetic analysis and genome size of Ostreococcus tauri (Chlorophyta, Prasinophyceae)}, journal = {Journal of Phycology}, volume = {34}, number = {5}, year = {1998}, note = {tex.mendeley-tags: RCC745}, pages = {844{\textendash}849}, abstract = {Ostreococcus tauri Courties et Chretiennot-Dinet is the smallest described autotrophic eukaryote dominating the phytoplanktonic assemblage of the marine Mediterranean Thau lagoon (France). Its taxonomic position was partly elucidated from ultrastructure and high-pressure liquid chromatography (HLPC) pigment analysis. The sequence analysis of the 18S rDNA gene of O. Tauri measured here is available in EMBL Nucleotide Sequence Database (accession number: Y15814) and allowed to clarify its phylogenetic position. O. Tauri belongs to the Prasinophyceae and appears very close to Mantoniella, a typical scaly Prasinophyceae, morphologically very different from the naked and coccoid Ostreococcus. An electrophoretic analysis of O. Tauri shows that the nucleus contains 10.20 mbp. This small genome fragmented into 14 chromosomes ranging in size from 300 to 1500 kbp, confirms the minimalist characteristics of Ostreococcus tauri.}, keywords = {rcc, RCC745, SBR$_\textrmP$hyto}, doi = {10.1046/j.1529-8817.1998.340844.x}, author = {Courties, C and Perasso, R and Chr{\'e}tiennot-Dinet, M.-J. and Gouy, M and Guillou, L and Troussellier, M} }