@article {six_marine_2021,
	title = {Marine Synechococcus  picocyanobacteria: Light utilization across latitudes},
	journal = {Proceedings of the National Academy of Sciences},
	volume = {118},
	number = {38},
	year = {2021},
	note = {Publisher: National Academy of Sciences Section: Biological Sciences},
	abstract = {<p>The most ubiquitous cyanobacteria, Synechococcus, have colonized different marine thermal niches through the evolutionary specialization of lineages adapted to different ranges of temperature seawater. We used the strains of Synechococcus temperature ecotypes to study how light utilization has evolved in the function of temperature. The tropical Synechococcus (clade II) was unable to grow under 16 {\textdegree}C but, at temperatures \&gt;25 {\textdegree}C, induced very high growth rates that relied on a strong synthesis of the components of the photosynthetic machinery, leading to a large increase in photosystem cross-section and electron flux. By contrast, the Synechococcus adapted to subpolar habitats (clade I) grew more slowly but was able to cope with temperatures \&lt;10 {\textdegree}C. We show that growth at such temperatures was accompanied by a large increase of the photoprotection capacities using the orange carotenoid protein (OCP). Metagenomic analyzes revealed that Synechococcus natural communities show the highest prevalence of the ocp genes in low-temperature niches, whereas most tropical clade II Synechococcus have lost the gene. Moreover, bioinformatic analyzes suggested that the OCP variants of the two cold-adapted Synechococcus clades I and IV have undergone evolutionary convergence through the adaptation of the molecular flexibility. Our study points to an important role of temperature in the evolution of the OCP. We, furthermore, discuss the implications of the different metabolic cost of these physiological strategies on the competitiveness of Synechococcus in a warming ocean. This study can help improve the current hypotheses and models aimed at predicting the changes in ocean carbon fluxes in response to global warming.</p>
},
	keywords = {?? Invalid DOI, RCC2035, rcc2382, RCC2385, RCC2421, RCC2527, RCC2535, RCC2553, RCC2570, RCC515, rcc539, rcc752, rcc791, to add},
	issn = {0027-8424, 1091-6490},
	doi = {10.1073/pnas.2111300118},
	url = {http://www.pnas.org/content/118/38/e2111300118},
	author = {Six, Christophe and Ratin, Morgane and Marie, Dominique and Corre, Erwan}
}
@article {Balzano2017c,
	title = {Morphological and genetic diversity of Beaufort Sea diatoms with high contributions from the Chaetoceros neogracilis species complex},
	journal = {Journal of Phycology},
	volume = {53},
	number = {1},
	year = {2017},
	note = {tex.mendeley-tags: RCC1984,RCC1985,RCC1986,RCC1988,RCC1989,RCC1990,RCC1991,RCC1992,RCC1993,RCC1995,RCC1997,RCC1999,RCC2000,RCC2002,RCC2003,RCC2004,RCC2005,RCC2006,RCC2008,RCC2010,RCC2011,RCC2012,RCC2014,RCC2016,RCC2017,RCC2021,RCC2037,RCC2038,RCC2039,RCC2042,RCC2043,RCC2261,RCC2262,RCC2263,RCC2264,RCC2265,RCC2266,RCC2267,RCC2268,RCC2269,RCC2270,RCC2272,RCC2273,RCC2274,RCC2275,RCC2276,RCC2277,RCC2278,RCC2279,RCC2280,RCC2281,RCC2282,RCC2318,RCC2506,RCC2517,RCC2520,RCC2521,RCC2522},
	month = {feb},
	pages = {161{\textendash}187},
	abstract = {Seventy-five diatom strains isolated from the Beaufort Sea (Canadian Arctic) in the summer of 2009 were characterized by light and electron microscopy (SEM and TEM), as well as 18S and 28S rRNA gene sequencing. These strains group into 20 genotypes and 17 morphotypes and are affiliated with the genera Arcocellulus, Attheya, Chaetoceros, Cylindrotheca, Eucampia, Nitzschia, Porosira, Pseudo-nitzschia, Shionodiscus, Thalassiosira, and Synedropsis. Most of the species have a distribution confined to the northern/polar area. Chaetoceros neogracilis and Chaetoceros gelidus were the most represented taxa. Strains of C. neogracilis were morphologically similar and shared identical 18S rRNA gene sequences, but belonged to four distinct genetic clades based on 28S rRNA, ITS-1 and ITS-2 phylogenies. Secondary structure prediction revealed that these four clades differ in hemi-compensatory base changes (HCBCs) in paired positions of the ITS-2, suggesting their inability to interbreed. Reproductively isolated C. neogracilis genotypes can thus co-occur in summer phytoplankton communities in the Beaufort Sea. C. neogracilis generally occurred as single cells but also formed short colonies. It is phylogenetically distinct from an Antarctic species, erroneously identified in some previous studies as C. neogracilis, but named here as Chaetoceros sp. This work provides taxonomically validated sequences for 20 Arctic diatom taxa, which will facilitate future metabarcoding studies on phytoplankton in this region.},
	keywords = {RCC1984, RCC1985, RCC1986, RCC1988, RCC1989, RCC1990, RCC1991, RCC1992, RCC1993, RCC1995, RCC1997, RCC1999, RCC2000, RCC2002, RCC2003, RCC2004, RCC2005, RCC2006, RCC2008, RCC2010, RCC2011, RCC2012, RCC2014, RCC2016, RCC2017, RCC2021, RCC2037, RCC2038, RCC2039, RCC2042, RCC2043, RCC2261, RCC2262, RCC2263, RCC2264, RCC2265, RCC2266, RCC2267, RCC2268, RCC2269, RCC2270, RCC2272, RCC2273, RCC2274, RCC2275, RCC2276, RCC2277, RCC2278, RCC2279, RCC2280, RCC2281, RCC2282, RCC2318, RCC2506, RCC2517, RCC2520, RCC2521, RCC2522},
	issn = {00223646},
	doi = {10.1111/jpy.12489},
	url = {http://doi.wiley.com/10.1111/jpy.12489},
	author = {Balzano, Sergio and Percopo, Isabella and Siano, Raffaele and Gourvil, Priscillia and Chanoine, M{\'e}lanie and Marie, Dominique and Vaulot, Daniel and Sarno, Diana},
	editor = {Wood, M.}
}
@article {Zhu2005,
	title = {Mapping of picoeucaryotes in marine ecosystems with quantitative PCR of the 18S rRNA gene},
	journal = {FEMS Microbiology Ecology},
	volume = {52},
	number = {1},
	year = {2005},
	note = {tex.mendeley-tags: Micromonas,RCC,rcc},
	pages = {79{\textendash}92},
	abstract = {A quantitative PCR (QPCR) assay based on the use of SYBR Green I was developed to assess the abundance of specific groups of picoeukaryotes in marine waters. Six primer sets were designed targeting four different taxonomic levels: domain (Eukaryota), division (Chlorophyta), order (Mamiellales) and genus (Bathycoccus, Micromonas, and Ostreococcus). Reaction conditions were optimized for each primer set which was validated in silico, on agarose gels, and by QPCR against a variety of target and non-target cultures. The approach was tested by estimating gene copy numbers for Micromonas, Bathycoccus, and Ostreococcus in seawater samples to which cultured cells were added in various concentrations. QPCR was then used to determine that rRNA gene (rDNA) copy number varied from one to more than 12,000 in 18 strains of phytoplankton. Finally, QPCR was applied to environmental samples from a Mediterranean Sea coastal site and the results were compared to those obtained by Fluorescent in situ hybridization (FISH). The data obtained demonstrate that Chlorophyta and more specifically Mamiellales were important in these waters, especially during the winter picoplankton bloom. The timing of major abundance peaks of the targeted species was similar by QPCR and FISH. When used in conjunction with other techniques such as FISH or gene clone libraries, QPCR appears as very promising to quickly obtain data on the ecological distribution of important phytoplankton groups. Data interpretation must take into account primer specificity and the varying rRNA gene copy number among eukaryotes. ?? 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.},
	keywords = {Coastal ecosystems, Ecology, Fluorescent in situ hybridization, Micromonas, picoplankton, prasinophytes, Quantitative PCR, rcc},
	author = {Zhu, Fei and Massana, Ramon and Not, Fabrice and Marie, Dominique and Vaulot, Daniel}
}
