Carbon and nitrogen productivity during spring in the oligotrophic Indian Ocean along the GO-SHIP IO9N transect

Baer, Steven E.; Rauschenberg, Sara; Garcia, Catherine A.; Garcia, Nathan S.; Martiny, Adam C.; Twining, Benjamin S.; Lomas, Michael W.

doi:10.1016/j.dsr2.2018.11.008

Cited by 32 publications

(57 citation statements)

References 67 publications

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“…Approximately 15 individual cells were analyzed at each station or incubation time point. Picoplankton (cyanobacteria and picoeukaryotes) were the most abundant phytoplankton group at most stations (Baer et al, 2018), but their metal contents were generally below detection limits of the beamline as configured. Flagellated autotrophs with diameters ranging from 1.65 to 6.6 μm were imaged using 2D raster scans with 0.5 μm pixel step sizes (beam size = 0.65 μm FWHM) and detector dwell times from 10 to 20 s/pixel.…”

Section: Cellular Metal Quotasmentioning

confidence: 92%

“…Macronutrient concentrations are presented in Baer et al (2018). Concentrations of nitrate and phosphate were extremely low in surface waters and, with the exception of one station at 6.5˚N, entirely below the detection limit of 0.05 μmoL/L.…”

Section: Macronutrient Distributionsmentioning

confidence: 97%

“…Cellular C was then calculated from the volumes using the equations described in Menden-Deuer and Lessard (2000). Comparison of cell-specific C calculated for SXRF samples with values estimated with flow cytometry by Baer et al (2018) reveal that SXRF target cells mostly fit between the picoeukaryote and nanoeukaryote classifications. Baer et al estimated picoeukaryote and nanoeukaryote cell C to range from 39 to 133 fmol C/cell and 496-2230 fmol C/cell, respectively.…”

Section: Cellular Metal Quotasmentioning

confidence: 99%

“…25°C) and very low macronutrients (nitrate <0.05 μM). The equatorial region of the Indian Ocean (EqIO, 10°S -5°N) is an area of weak upwelling, resulting in somewhat higher nutrient concentrations and productivity (Baer et al, 2018;Thi Dieu Vu and Sohrin, 2013;Wiggert et al, 2006). Further to the north, the Bay of Bengal (BoB) is characterized by even warmer waters and elevated nutrient supply from the sur rounding margins, leading to higher productivity (Kumar et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, we present metal quotas of the nanoplankton autotrophs abundant in subtropical waters of the global ocean and which are particularly underrepresented in laboratory and field work. This work was conducted in collaboration with efforts to assess differences in primary production, N biogeochemistry, and phytoplankton community composition and dynamics in this region (Baer et al, 2018;Garcia et al, 2018;Larkin et al, 2019). Additionally, we conducted shipboard nutrient-addition incubations to assess the primary limiting nutrient in each of the regions.…”

Section: Introductionmentioning

confidence: 99%

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A nutrient limitation mosaic in the eastern tropical Indian Ocean

Twining

Rauschenberg

Baer

et al. 2019

Deep Sea Research Part II: Topical Studies in Oceanography

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The Indian Ocean accounts for about one fifth of global ocean net primary production but remains undersampled relative to other major ocean basins. The eastern tropical Indian Ocean is characterized by extremely low concentrations of both macronutrients and the micronutrient iron. We measured concentrations of dissolved and particulate trace metals (Fe, Mn, Zn, Pb) in the upper ocean along the GO-SHIP IO9N transect (28˚S to 17˚N, mostly along the 95˚E meridian) during a cruise in April 2016. Cellular quotas (metal/C) of Fe, Mn, Co, Ni, Cu, and Zn were measured in small eukaryotic flagellates (2-7 μm). Deckboard bottle incubation experiments were conducted at one station in each of three putative biogeochemical regions: southern Indian Ocean gyre (SIO, 28-10˚S); equatorial Indian Ocean (EqIO, 10˚S-5˚N); Bay of Bengal (Bob, 5-17˚N). Nitrate and phosphate were below detection limits in surface waters across the transect. Dissolved and particulate Fe were <0.2 nM south of 10˚N and lowest in the EqIO.

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Section: Cellular Metal Quotasmentioning

confidence: 92%

Section: Macronutrient Distributionsmentioning

confidence: 97%

Section: Cellular Metal Quotasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A nutrient limitation mosaic in the eastern tropical Indian Ocean

Twining

Rauschenberg

Baer

et al. 2019

Deep Sea Research Part II: Topical Studies in Oceanography

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Nutrient Biogeochemistry

2021

Tropical Marine Ecology

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Subtle biogeochemical regimes in the Indian Ocean revealed by spatial and diel frequency of Prochlorococcus haplotypes

Larkin

Garcia

Ingoglia

et al. 2019

Limnology & Oceanography

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While the majority of studies use the environment to describe microbial populations, the high diversity of microbes can conversely be used as a resource to understand subtle environmental variability. Here, we used a high‐resolution spatial and temporal analysis of Prochlorococcus sp. in the Eastern Indian Ocean to determine whether ecotypes and microdiverse taxa can be used to identify fine‐scale biogeochemical regimes in this under‐studied region. A total of 246 DNA samples were collected every 4–6 h in April 2016 on GO‐SHIP cruise I09N, which transected gyre, equatorial, and monsoonal ecosystems between Western Australia and the Bay of Bengal. Using amplicon sequencing of the highly variable rpoC1 marker, we found that the region was largely dominated by the Prochlorococcus HL‐II clade. Conserved single nucleotide polymorphisms (SNPs) were used to identify four microdiverse haplotypes, or SNP‐delineated taxa, within the HL‐II clade of Prochlorococcus. The haplotypes showed regional patterns of relative gene count abundance that were significantly correlated with environmental conditions. Additionally, we used nonlinear least squares models to fit the sine wave function to our data and demonstrate that the haplotypes show distinct patterns in relative diel frequency, providing evidence that these microdiverse populations are ecologically and evolutionarily distinct. Overall, we show how the integration of a genomics data set into a biogeochemical framework can reveal a more nuanced understanding of a complex ocean basin.

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Carbon and nitrogen productivity during spring in the oligotrophic Indian Ocean along the GO-SHIP IO9N transect

Cited by 32 publications

References 67 publications

A nutrient limitation mosaic in the eastern tropical Indian Ocean

A nutrient limitation mosaic in the eastern tropical Indian Ocean

Nutrient Biogeochemistry

Subtle biogeochemical regimes in the Indian Ocean revealed by spatial and diel frequency of Prochlorococcus haplotypes

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