Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond
The metabolism of estuarine environments is often estimated by measuring changes in dissolved oxygen concentrations. A central assumption of common oxygen-based approaches is that oxygen consumption rates (primarily respiration) are similar under light and dark conditions. Evaluating this assumption...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2020
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| Online Access: | https://hdl.handle.net/1721.1/128711 |
| _version_ | 1826202128997154816 |
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| author | Howard, Evan M. Spivak, Amanda C. Karolewski, Jennifer S. Gosselin, Kelsey M. Sandwith, Zoe O. Manning, Cara C. Stanley, Rachel H. R. |
| author2 | Woods Hole Oceanographic Institution |
| author_facet | Woods Hole Oceanographic Institution Howard, Evan M. Spivak, Amanda C. Karolewski, Jennifer S. Gosselin, Kelsey M. Sandwith, Zoe O. Manning, Cara C. Stanley, Rachel H. R. |
| author_sort | Howard, Evan M. |
| collection | MIT |
| description | The metabolism of estuarine environments is often estimated by measuring changes in dissolved oxygen concentrations. A central assumption of common oxygen-based approaches is that oxygen consumption rates (primarily respiration) are similar under light and dark conditions. Evaluating this assumption is critical, especially in benthic-dominated systems, because differences between daytime and nighttime respiration could result in underestimation or overestimation of ecosystem productivity. We evaluated rates of gross oxygen production over hourly to seasonal time scales in a shallow, temperate salt marsh pond. To assess whether a dissolved oxygen diel mass balance underestimated gross oxygen productivity, we compared rates using this traditional approach and using the triple oxygen isotope tracer of photosynthesis. This is a powerful combination because the triple oxygen isotope approach is theoretically insensitive to respiration. The methods agreed well over daily to seasonal time scales. However, during midday periods of peak light and productivity, the triple oxygen isotope approach resulted in higher hourly scale gross oxygen production rates. The timing and magnitude of this short-term difference is consistent with light-dependent oxygen uptake fluxes including photoreduction and/or light-stimulated community respiration. Finally, aquatic vegetation was associated with variability in productivity across the pond. Such small-scale environmental heterogeneity is evidence that this shallow pond was not laterally well mixed, and likely contributes to the dynamism of these common estuarine environments. |
| first_indexed | 2024-09-23T12:02:18Z |
| format | Article |
| id | mit-1721.1/128711 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:02:18Z |
| publishDate | 2020 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1287112022-09-27T23:42:39Z Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond Howard, Evan M. Spivak, Amanda C. Karolewski, Jennifer S. Gosselin, Kelsey M. Sandwith, Zoe O. Manning, Cara C. Stanley, Rachel H. R. Woods Hole Oceanographic Institution Joint Program in Oceanography The metabolism of estuarine environments is often estimated by measuring changes in dissolved oxygen concentrations. A central assumption of common oxygen-based approaches is that oxygen consumption rates (primarily respiration) are similar under light and dark conditions. Evaluating this assumption is critical, especially in benthic-dominated systems, because differences between daytime and nighttime respiration could result in underestimation or overestimation of ecosystem productivity. We evaluated rates of gross oxygen production over hourly to seasonal time scales in a shallow, temperate salt marsh pond. To assess whether a dissolved oxygen diel mass balance underestimated gross oxygen productivity, we compared rates using this traditional approach and using the triple oxygen isotope tracer of photosynthesis. This is a powerful combination because the triple oxygen isotope approach is theoretically insensitive to respiration. The methods agreed well over daily to seasonal time scales. However, during midday periods of peak light and productivity, the triple oxygen isotope approach resulted in higher hourly scale gross oxygen production rates. The timing and magnitude of this short-term difference is consistent with light-dependent oxygen uptake fluxes including photoreduction and/or light-stimulated community respiration. Finally, aquatic vegetation was associated with variability in productivity across the pond. Such small-scale environmental heterogeneity is evidence that this shallow pond was not laterally well mixed, and likely contributes to the dynamism of these common estuarine environments. 2020-12-01T23:27:21Z 2020-12-01T23:27:21Z 2020-07 2020-05 2020-10-22T03:25:42Z Article http://purl.org/eprint/type/JournalArticle 1559-2723 1559-2731 https://hdl.handle.net/1721.1/128711 Howard, Evan M. et al. "Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond." Estuaries and Coasts 43, 8 (December 2020): 1908–1922 © 2020 Coastal and Estuarine Research Federation en https://doi.org/10.1007/s12237-020-00757-6 Estuaries and Coasts Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. Coastal and Estuarine Research Federation application/pdf Springer Science and Business Media LLC Springer US |
| spellingShingle | Howard, Evan M. Spivak, Amanda C. Karolewski, Jennifer S. Gosselin, Kelsey M. Sandwith, Zoe O. Manning, Cara C. Stanley, Rachel H. R. Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title | Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title_full | Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title_fullStr | Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title_full_unstemmed | Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title_short | Oxygen and Triple Oxygen Isotope Measurements Provide Different Insights into Gross Oxygen Production in a Shallow Salt Marsh Pond |
| title_sort | oxygen and triple oxygen isotope measurements provide different insights into gross oxygen production in a shallow salt marsh pond |
| url | https://hdl.handle.net/1721.1/128711 |
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