Seasonal and interannual dynamics of nutrients and phytoplankton pigments in the western Mediterranean Sea at the DYFAMED time-series station (1991–1999)

Marty, Jean-Claude; Chiavérini, Jacques; Pizay, Marie-Dominique; Avril, Bernard

doi:10.1016/s0967-0645(02)00022-x

Cited by 358 publications

(307 citation statements)

References 56 publications

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“…[dFe] [Bonnet and Guieu, 2006], TChla [Marty et al, 2002], BA [Lemée et al, 2002] and DOC [Avril, 2002] .85 nM-eqFe) were of the same order of magnitude as the July value in our study (4.9 nM-eqFe). Seasonal variations of organic speciation have been demonstrated for copper [Croot, 2003] but, to our knowledge, this is the first report of the temporal variability of iron binding ligands at a yearly scale.…”

Section: Temporal Variation Of Iron Binding Ligand Concentrationssupporting

confidence: 81%

Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Wagener¹,

Pulido-Villena²,

Guieu³

2008

Geophysical Research Letters

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[1] A better comprehension of atmospheric iron dissolution in seawater would be a key advance in understanding the atmospheric supply of iron to the ocean and its role on marine biogeochemistry. So far, different studies have demonstrated that dissolution of atmospheric iron depends on physical and chemical properties of the particles, which can be modified during their transport from the source. Here, based on a one-year time-series in the Western Mediterranean Sea, we show that dissolution of iron from a Saharan desert dust sample in seawater follows the seasonal trend of the dissolved organic carbon (DOC) variability in the surface layer. As part of the DOC pool, the role of iron binding ligands, probably derived from bacteria activity, has also been investigated. The dust iron dissolution rates are found to be linearly dependent on iron binding ligands and dissolved organic carbon concentrations (r 2 > 0.65, p < 0.01, n = 9).

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Section: Temporal Variation Of Iron Binding Ligand Concentrationssupporting

confidence: 81%

Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Wagener¹,

Pulido-Villena²,

Guieu³

2008

Geophysical Research Letters

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“…The HL I clade, in contrast, is adapted to cold waters, while HL II thrives in both moderate and high temperature waters (Supplementary Figure 1) Zinser et al, 2007). Second, HL III and HL IV were only found where inorganic phosphorus levels were relatively high (4100 nM in this study and West et al, 2011) (Figure 1; Supplementary Figure 2), whereas HL II and HL I inhabit both high and low phosphorous environments, including the Sargasso and Mediterranean Seas where dissolved inorganic phosphorous levels are often o1 nM (Wu et al, 2000;Marty et al, 2002). Finally, HL III and HL IV appear to be restricted to waters with low iron concentrations.…”

Section: Abundance and Distribution Of Hl III And Hl Ivmentioning

confidence: 60%

Ecology of uncultured Prochlorococcus clades revealed through single-cell genomics and biogeographic analysis

et al. 2012

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Prochlorococcus is the numerically dominant photosynthetic organism throughout much of the world’s oceans, yet little is known about the ecology and genetic diversity of populations inhabiting tropical waters. To help close this gap, we examined natural Prochlorococcus communities in the tropical Pacific Ocean using a single-cell whole-genome amplification and sequencing. Analysis of the gene content of just 10 single cells from these waters added 394 new genes to the Prochlorococcus pan-genome—that is, genes never before seen in a Prochlorococcus cell. Analysis of marker genes, including the ribosomal internal transcribed sequence, from dozens of individual cells revealed several representatives from two uncultivated clades of Prochlorococcus previously identified as HNLC1 and HNLC2. While the HNLC clades can dominate Prochlorococcus communities under certain conditions, their overall geographic distribution was highly restricted compared with other clades of Prochlorococcus. In the Atlantic and Pacific oceans, these clades were only found in warm waters with low Fe and high inorganic P levels. Genomic analysis suggests that at least one of these clades thrives in low Fe environments by scavenging organic-bound Fe, a process previously unknown in Prochlorococcus. Furthermore, the capacity to utilize organic-bound Fe appears to have been acquired horizontally and may be exchanged among other clades of Prochlorococcus. Finally, one of the single Prochlorococcus cells sequenced contained a partial genome of what appears to be a prophage integrated into the genome.

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“…We think not because SB and MIT0604-both narB-containing strains-grow at equal or better rates on ammonium compared with other HL adapted Prochlorococcus strains (Figure 1 and Supplementary Figure S1). An alternative explanation is that most of the early cultures of Prochlorococcus were isolated from environments that are relatively nitrogen replete-that is, thought to be more limited by phosphorus or iron availability (for example, the Sargasso Sea, Mediterranean Sea and the Equatorial Pacific) (Vaulot et al, 1996;Mann and Chisholm, 2000;Wu et al, 2000;Marty et al, 2002;Kettler et al, 2007;Rusch et al, 2010). We now know that Prochlorococcus cells capable of nitrate assimilation are more likely to be found in ocean regions with lower average nitrate concentrations, such as the Caribbean Sea and Indian Ocean (Martiny et al, 2009b).…”

Section: Resultsmentioning

confidence: 99%

Physiology and evolution of nitrate acquisition in Prochlorococcus

et al. 2014

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Prochlorococcus is the numerically dominant phototroph in the oligotrophic subtropical ocean and carries out a significant fraction of marine primary productivity. Although field studies have provided evidence for nitrate uptake by Prochlorococcus, little is known about this trait because axenic cultures capable of growth on nitrate have not been available. Additionally, all previously sequenced genomes lacked the genes necessary for nitrate assimilation. Here we introduce three Prochlorococcus strains capable of growth on nitrate and analyze their physiology and genome architecture. We show that the growth of high-light (HL) adapted strains on nitrate is B17% slower than their growth on ammonium. By analyzing 41 Prochlorococcus genomes, we find that genes for nitrate assimilation have been gained multiple times during the evolution of this group, and can be found in at least three lineages. In low-light adapted strains, nitrate assimilation genes are located in the same genomic context as in marine Synechococcus. These genes are located elsewhere in HL adapted strains and may often exist as a stable genetic acquisition as suggested by the striking degree of similarity in the order, phylogeny and location of these genes in one HL adapted strain and a consensus assembly of environmental Prochlorococcus metagenome sequences. In another HL adapted strain, nitrate utilization genes may have been independently acquired as indicated by adjacent phage mobility elements; these genes are also duplicated with each copy detected in separate genomic islands. These results provide direct evidence for nitrate utilization by Prochlorococcus and illuminate the complex evolutionary history of this trait.

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Seasonal and interannual dynamics of nutrients and phytoplankton pigments in the western Mediterranean Sea at the DYFAMED time-series station (1991–1999)

Cited by 358 publications

References 56 publications

Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Dust iron dissolution in seawater: Results from a one‐year time‐series in the Mediterranean Sea

Ecology of uncultured Prochlorococcus clades revealed through single-cell genomics and biogeographic analysis

Physiology and evolution of nitrate acquisition in Prochlorococcus

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