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Variation in ecosystem carbon dynamics of saltwater marshes in the northern Gulf of Mexico

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Abstract

Wetlands are highly productive ecosystems that can sequester large quantities of carbon. However, variation in physiological potential can alter their capacity to sequester carbon. To examine variation in ecosystem physiological capacity, we established three coastal marsh sites in Mississippi and Alabama spanning a productivity gradient. Over 1 year, we measured ecophysiological activity and spectral indices in two vegetation zones within each marsh to develop a better understanding of variation in ecosystem responses and health. Gross ecosystem exchange of carbon and ecosystem respiration rates (Reco) differed significantly among sites, with the highest activity at Grand Bay, Mississippi and Point Aux Pines, Alabama and lower ecophysiological activity at Dauphin Island, Alabama. Net ecosystem exchange was similar for all three study areas because greater carbon assimilation was negated by higher levels of respiration. Spectral indices and leaf area were significantly different by marsh vegetation zone, suggesting that alterations in species composition and plant productivity can have important implications for carbon sequestration. While limited to 1 year, this study establishes a foundation by which to evaluate future research conducted over greater temporal and spatial scales, thereby enhancing our understanding of marsh physiological activity.

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Acknowledgements

The authors would like to thank Jay McIlwain and the professional staff at Grand Bay National Estuarine Research Reserve who dedicated time and resources to this project. Furthermore, we would like to thank field volunteers Phillip Jarnigan, Cathy Jarnigan, Betsy Jarnigan, Wesley Jarnigan, Nicholas Sanders, Joshua Jones and Catherine Rice.

Funding

Support for this project was provided by the Marine Environmental Science Consortium BP Global Reporting Initiative grant T1-002-UA.

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Correspondence to Gregory Starr.

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Starr, G., Jarnigan, J.R., Staudhammer, C.L. et al. Variation in ecosystem carbon dynamics of saltwater marshes in the northern Gulf of Mexico. Wetlands Ecol Manage 26, 581–596 (2018). https://doi.org/10.1007/s11273-018-9593-z

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