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OAS accession Detail for 0291948
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| accessions_id: | 0291948 | archive |
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| Title: | Series 4A: Multiple stressor experiments on Synechococcus elongatus (CCMP1629) – nutrients from 2019-07-01 to 2019-08-01 (NCEI Accession 0291948) |
| Abstract: | This dataset contains chemical, optical, and physical data collected from 2019-07-01 to 2019-08-01. These data include Nitrite, Partial pressure of CO2, irradiance, nitrate plus nitrite, reactive phosphorus (PO4), and water temperature. The instruments used to collect these data include Cell Cultivator and Nutrient Autoanalyzer. These data were collected by Dr Edward Laws of Louisiana State University and Nigel D'Souza and Uta Passow of University of California-Santa Barbara as part of the "Collaborative Research: Effects of multiple stressors on Marine Phytoplankton (Stressors on Marine Phytoplankton)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-08-31. The following is the text of the dataset description provided by BCO-DMO: Series 4A: nutrients Dataset Description: The experiments in Series 4A were designed to test the combined effects of two CO2 concentrations, four temperatures, and three light intensities on growth and photophysiology of the cyanobacteria Synechococcus elongatus CCMP1629 in a multifactorial design. This dataset contains measurements of nutrients (phosphate, nitrate, and nitrate + nitrite) made over the course of the experiments. |
| Date received: | 20200831 |
| Start date: | 20190701 |
| End date: | 20190801 |
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| Observation types: | chemical, optical, physical |
| Instrument types: | nutrient autoanalyzer |
| Datatypes: | irradiance, nitrate + nitrite content (concentration), NITRITE, partial pressure of carbon dioxide - water, phosphate, WATER TEMPERATURE |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | Louisiana State University, University of California - Santa Barbara |
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| Supplementary information: | Acquisition Description: The experiments were designed to test the combined effects of two CO 2 concentrations, four temperatures, and three light intensities on growth and photophysiology of the cyanobacterium Synechococcus elongatus CCMP1629 in a multifactorial design. Two CO 2 concentrations were tested: 410 ppm, and 1000 ppm. For each CO 2 concentration, four temperatures were tested: 20°C, 28°C, 36°C, and 44°C. Within each temperature, three light levels were tested: sub-optimum irradiance (SOI) intensity of 50 umol photons · m -2 · s -1 , optimum irradiance (OI) intensity of 230 umol photons · m -2 · s -1 and extreme Irradiance (EI) intensity of 600 umol photons · m -2 · s -1 . All lights were set at a 12 h day: 12 h dark cycle. For logistical reasons, experiments were partially conducted in series, with all light treatments at all four temperatures running simultaneously. This was repeated for each CO 2 concentration. Experiments were conducted in Multicultivator MC-1000 OD units (Photon Systems Instruments, Drasov, Czech Republic). Each unit consists of eight 85 ml test-tubes immersed in a thermostated water bath, each independently illuminated by an array of cool white LEDs set at specific intensity and timing. A 0.2um filtered CO 2 -air mix (Praxair Distribution Inc.) was bubbled through sterile artificial seawater, and the humidified gas mix was supplied to each tube via gentle sparging through a 2um stainless steel diffuser. Flow rates were gradually increased over the course of the incubation to compensate for the DIC uptake of actively growing cells, and ranged from Experiments were conducted with artificial seawater (ASW) prepared using previously described methods (Kester et. al 1967), and enriched with nitrate (NO 3 ), and phosphate (PO 4 ), at levels ensuring that the cultures would remain nutrient-replete over the course of the experiment. Trace metals and vitamins were added as in f/2 (Guillard 1975). The expected DIC concentration, and pH of the growth media was determined for the different pCO 2 and temperatures using the CO2SYS calculator (Pierrot et al. 2006), with constants from Mehrbach et al. (1973, refit by Dickson & Millero 1987), and inputs of temperature, salinity, total alkalinity (2376.5 umol · kg −1 ), pCO 2 , phosphate, and silicic acid. DIC levels in ASW at the start of each phase of the experiments were manipulated by the addition of NaHCO 3 , and was then maintained by bubbling a CO 2 -Air mix through the cultures over the course of the experiments. The pH of the growth media was measured spectrophometrically using the m-cresol purple method (Dickson 1993), and adjusted using 0.1N HCl or 0.1M NaOH. The media was distributed into 75 ml aliquots and each aliquot was inoculated with the S. elongatus CCMP 1629 (SE1629) stock culture at the start of the experiments. Macronutrient concentrations: Media was filtered through 0.2 um filters into clean (plastic) bottles and stored at -20°C until analyses for nutrients. During the experiment, subsamples were filtered through 0.2 micron filters for Chl-a analyses, and through GF/F filters for particulate carbon (POC) analyses. The filtrate from these filtrations was pooled into acid-washed HDPE containers, and stored at -20°C until analyses. Replicates were not pooled on the final day of the experiment. Phosphate (PO4), Nitrite (NO2), and Nitrate (NO3) + Nitrite (NO2) were measured by Flow injection analysis (FIA) using a QuikChem 8500 Series 2 AutoAnalyzer (Lachat Instruments, Zellweger Analytics, Inc.). |
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| Metadata version: | 1 |
| Keydate: | 2024-04-27 17:35:40+00 |
| Editdate: | 2024-04-27 17:35:55+00 |