Summary of Study ST002539
This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR001635. The data can be accessed directly via it's Project DOI: 10.21228/M8C42F This work is supported by NIH grant, U2C- DK119886.
See: https://www.metabolomicsworkbench.org/about/howtocite.php
This study contains a large results data set and is not available in the mwTab file. It is only available for download via FTP as data file(s) here.
| Study ID | ST002539 |
| Study Title | Microbial metabolomic responses to changes in temperature and salinity along the western Antarctic Peninsula. |
| Study Type | Study of particulate metabolites in phytoplankton and sea-ice algae along the Western Antarctic Peninsula |
| Study Summary | Seasonal cycles within the marginal ice zones in polar regions include large shifts in temperature and salinity that strongly influence microbial abundance and physiology. However, the combined effects of concurrent temperature and salinity change on microbial community structure and biochemical composition during transitions between seawater and sea ice are not well understood. Coastal marine communities along the western Antarctic Peninsula were sampled and surface seawater was incubated at combinations of temperature and salinity mimicking the formation (cold, salty) and melting (warm, fresh) of sea ice to evaluate how these factors may shape community composition and particulate metabolite pools during seasonal transitions. Bacterial and algal community structures were tightly coupled to each other and distinct across sea-ice, seawater, and sea-ice-meltwater field samples, with unique metabolite profiles in each habitat. During short-term (approximately 10-day) incubations of seawater microbial communities under different temperature and salinity conditions, community compositions changed minimally while metabolite pools shifted greatly, strongly accumulating compatible solutes like proline and glycine betaine under cold and salty conditions. Lower salinities reduced total metabolite concentrations in particulate matter, which may indicate a release of metabolites into the labile dissolved organic matter pool. Low salinity also increased acylcarnitine concentrations in particulate matter, suggesting a potential for fatty acid degradation and reduced nutritional value at the base of the food web during freshening. Our findings have consequences for food web dynamics, microbial interactions, and carbon cycling as polar regions undergo rapid climate change. |
| Institute | University of Washington, School of Oceanography |
| Department | School of Oceanography |
| Laboratory | Young Lab |
| Last Name | Dawson |
| First Name | Hannah |
| Address | 1501 NE Boat St, Seattle, WA, 98195, USA |
| hmdawson@uw.edu | |
| Phone | 5404547754 |
| Submit Date | 2023-03-27 |
| Raw Data Available | Yes |
| Raw Data File Type(s) | mzXML |
| Analysis Type Detail | LC-MS |
| Release Date | 2023-05-25 |
| Release Version | 1 |
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Sample Preparation:
| Sampleprep ID: | SP002645 |
| Sampleprep Summary: | Each sample was extracted using a modified Bligh-Dyer extraction. Briefly, filters were put into 15 mL teflon centrifuge tubes containing a mixture of 100 µm and 400 µm silica beads. Heavy isotope-labeled internal standards were added along with ~2 mL of cold aqueous solvent (50:50 methanol:water) and ~3 mL of cold organic solvent (dichloromethane). The samples were shaken on a FastPrep-24 Homogenizer for 30 seconds and chilled in a -20 °C freezer repeatedly for three cycles of bead-beating and a total of 30 minutes of chilling. The organic and aqueous layers were separated by spinning samples in a centrifuge at 4,300 rpm for 2 minutes at 4 °C. The aqueous layer was removed to a new glass centrifuge tube. The remaining organic fraction was rinsed three more times with additions of 1 to 2 mL of 50:50 methanol:water. All aqueous rinses were combined for each sample and dried down under N2 gas. The remaining organic layer was transferred into a clean glass centrifuge tube and the remaining bead beating tube was rinsed two more times with cold organic solvent. The combined organic rinses were centrifuged, transferred to a new tube, and dried under N2 gas. Dried aqueous fractions were re-dissolved in 380 µL of water. Dried organic fractions were re-dissolved in 380 µL of 1:1 water:acetonitrile. 20 µL of isotope-labeled injection standards in water were added to both fractions. Blank filters were extracted alongside samples as methodological blanks. |
| Processing Storage Conditions: | On ice |
| Extraction Method: | Bligh-Dyer |
| Extract Storage: | -80℃ |
