Sediment NO3 reduction rates, associated genes, and environmental data from bimonthly samples collected along the York River Estuary from June 2018 to April 2019 (NCEI Accession 0291440)
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title: Sediment NO3 reduction rates, associated genes, and environmental data from bimonthly samples collected along the York River Estuary from June 2018 to April 2019 (NCEI Accession 0291440)
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abstract: This dataset contains biological, chemical, and physical data collected in the North Atlantic Ocean from 2018-06-13 to 2019-04-05. These data include Ammonium, Nitrate, Nitrite, chlorophyll a, depth, dissolved Oxygen, nitrate plus nitrite, phosphate, salinity calculated from CTD primary sensors, and water temperature. The instruments used to collect these data include Costech International Elemental Combustion System (ECS) 4010, Flow Injection Analyzer, Isotope-ratio Mass Spectrometer, Membrane Inlet Mass Spectrometer, and Spectrophotometer. These data were collected by Bongkeun Song, Iris C. Anderson, Kimberly Reece, and Mark J. Brush of Virginia Institute of Marine Science as part of the "Alteration of carbon fluxes by intense phytoplankton blooms in a microtidal estuary (LYRE)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-08-30. The following is the text of the dataset description provided by BCO-DMO: Sediment NO3 reduction rates, associated genes, and environmental data Dataset Description: Acquisition Description: Sampling: Sampling took place at 5 stations along the length of the York River Estuary in June, August, and October of 2018, and February and April of 2019 using 24ft Carolina skiffs. Two sediment cores (5.6 cm diameter, 10 cm deep) were collected at each station; the top 2 cm of sediment were separated from the rest of the core and the top 2cm from both replicate cores were composited. Slurry incubations: One gram of sediment from each sample was weighed into 5 exetainer tubes. After flushing for 5 minutes with helium (He) gas to create anoxic conditions, the tubes were incubated at in situ temperatures overnight to remove all background nitrate and re-flushed with He gas. Denitrification and anammox potential rate measurements were performed following established protocols (Semedo and Song, 2020; Song and Tobias, 2011); DNRA potential rate measurements followed a modified protocol from Yin et al. (2014). Each gram of sediment was spiked with 100 nmol of ¹⁵NO₃⁻ (99 atom %, Cambridge Isotopes) and incubated at in situ temperatures. The addition of 50% zinc chloride (0.5 ml) was used to stop all microbial activity immediately after spiking with ¹⁵NO₃⁻, for T0, or after a 1-hour incubation, for TF. The amount of accumulated ³⁰N₂ and ²⁹N₂ was then measured in the gas fraction using an isotope ratio mass spectrometer (IRMS, Model Delta V, ThermoScientific). Immediately following IRMS analysis, the exetainers were frozen (-80 degC) until analyzed for DNRA. Ammonium was extracted from the sediment incubation samples using 5 mL of 2 M potassium chloride (KCl). For each sample, 4mL of the KCl extract was diluted with 22 mL of autoclaved, Mili-Q filtered water and poured into two new exetainer tubes. One tube was left as a control and run on a membrane inlet mass spectrometer (MIMS, Pfeiffer Balzers Prisma) without any further additions; the second tube was spiked with 200 μL of a hypobromite solution that converts all NH₄⁺ to N₂ (Yin et al., 2014), inverted, and incubated for at least 15 minutes before being run on the MIMS. The concentration of excess ²⁹N₂ and ³⁰N₂ produced by the addition of the hypobromite solution was calculated for each sample based on the method of Risgaard-Petersen and Rysgaard (1995) with the exception that a single air equilibrated DI water standard, held at the same temperature as the samples, was used. The concentrations of excess ²⁹N₂ and ³⁰N₂ were used to calculate the concentration of ¹⁵NH₄⁺ present in the samples. qPCR Gene Abundance Measurements: DNA was extracted from each sample using 0.5g of sediment and the DNeasy PowerSoil Kit (Qiagen) following manufacturer protocols. The abundance of specific genes was measured using SYBR Green qPCR. The DNRA marker gene nrfA was measured using the primers nrfA2F/nrfA1R (Mohan et al., 2004; Welsh et al., 2014) and the following qPCR reaction: 6μL of GoTaq qPCR Master Mix (Promega), 0.03μL of CXR Reference Dye (Promega), 0.6μL of each primer, 0.25μL of MgCl2, and 4μL of sample DNA (at 1ng/ μL) with the remainder of the 12μL reaction volume made up with water. The nrfA qPCR protocol included an initial 10 minute step at 95°C followed by 50 cycles of: 95°C for 15s, 2°C for 45s, 72°C for 1 minute, and 80°C for 35s (Song et al., 2014). The qPCR reaction for nirS , the denitrification marker gene, included: 6μL of GoTaq qPCR Master Mix, 0.03μL of CXR Reference Dye, 0.6μL of the forward primer nirScdaF (Kandeler et al., 2006), 0.6μL of the reverse primer nirSR3cd (Kandeler et al., 2006), 0.12μL of BSA, and 4μL of sample DNA (at 1ng/ μL) with the remainder of the 12μL reaction volume made up with water and the protocol was: 95°C for 10 minutes, followed by 45 cycles of 95°C for 15s, 57°C for 1 minute, 72°C for 1 minute, and 80°C for 35s. The 16S rRNA qPCR reactions were set up in the same way as the nirS reactions, with the exception that the primers 515F-Y (Parada et al., 2016) and 806R (Caporaso et al., 2011) were used. The 16S qPCR protocol is as follows: 95°C for 10 minutes with 40 cycles of 95°C for 15s, 55°C for 30s, 70°C for 30s, with a melting curve analysis at the end. All qPCR samples were run in triplicate, with two no-template negative controls for each run. Gene abundance was calculated based on a standard curve produced with known quantities of the target gene. Instruments: Nutrient analyses (NO₃, NO₂, NH₄) were performed with a Lachat QuikChem 8000 automated ion analyzer (Lachat Instruments,Milwaukee, WI, USA; detection limits for NO₃, and NH₄, are 0.20 and 0.36 μM, respectively). Extracted chlorophyll-a was analyzed on a Beckman Coulter DU800 spectrophotometer. ²⁹N₂ and ³⁰N₂ was measured in the gaseous form by an isotope ratio mass spectrometer (Model Delta V, ThermoScientific) and in the liquid form by a membrane inlet mass spectrometer (MIMS, Balzers Prisma). C:N ratio was measured with a Costech elemental analyzer (Model 1040).
purpose: This dataset is available to the public for a wide variety of uses including scientific research and analysis.
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description: spectrophotometer, optical spectrometer, spectrograph or spectroscope An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. Butler, L. R. P.; Laqua, K. (1995). "Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)". Pure Appl. Chem. IUPAC. 67 (10): 1725–1744. doi:10.1351/pac199567101725. A spectrometer is the general term for describing a combination of spectral apparatus with one or more detectors to measure the intensity of one or more spectral bands."