Linking Hydrology and Dissolved Organic Matter Characteristics in a Subtropical Wetland: A Long-Term Study of the Florida Everglades

Regier, Peter; Larsen, Laurel; Cawley, Kaelin; Jaffé, Rudolf

doi:10.1029/2020gb006648

Title: Linking Hydrology and Dissolved Organic Matter Characteristics in a Subtropical Wetland: A Long-Term Study of the Florida Everglades

Journal Article · Tue Dec 15 00:00:00 EST 2020 · Global Biogeochemical Cycles

DOI:https://doi.org/10.1029/2020gb006648· OSTI ID:1755146

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^[2]; Cawley, Kaelin ^[3];

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Florida International Univ., Miami, FL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. of California, Berkeley, CA (United States)
National Ecological Observatory Network operated by Battelle, Boulder, CO (United States); Florida International Univ., Miami, FL (United States)
Florida International Univ., Miami, FL (United States)

Dissolved organic matter (DOM) acts as an important biogeochemical component of aquatic ecosystems that controls nutrient cycling, influences water quality, and links terrestrial and oceanic carbon pools, yet long-term studies of how changing environmental drivers alter its abundance and composition are rare. Using a ten-year, spatially explicit dataset from Everglades National Park (ENP), a globally significant wetland, we investigated the relationships between DOM quality/quantity and hydrologic/climatic drivers along two contrasting marsh-estuarine transects based on generalized linear modeling and a cumulative sums analysis. Analyses revealed distinct spatial, seasonal, and interannual patterns in variability of DOC and optical properties. Landscape-scale seasonal patterns showed an enrichment in microbial-like and protein-like DOM during the dry season relative to the wet season. We found that, while some compositional constituents varied with the solar calendar, responsive to temperature and photoperiod, others varied with the hydrologic calendar. Independent water level and discharge effects indicated strong hydrologic control on DOM quality that differed between the two transects, evidencing differences in their connectivity to areas of high agricultural activity. Across all sites, a significant long-term increasing trend in the fluorescence index was observed, associated with a positive correlation with precipitation and also potential changes in agricultural inputs, with other features associated with drought and hurricanes. Lastly, the cumulative sums analysis revealed differences between the two transects in the sensitivity of DOM composition to decreased water levels associated with 30-year climate scenarios, with the less hydrologically dynamic transect exhibiting greater potential sensitivity.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-76RL01830; DEB‐1237517; HRD‐1720912

OSTI ID:: 1755146

Report Number(s):: PNNL-SA-157260

Journal Information:: Global Biogeochemical Cycles, Vol. 34, Issue 12; ISSN 0886-6236

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Physical and biogeochemical controls on light attenuation in a eutrophic, back-barrier estuary Ganju, N. K.; Miselis, J. L.; Aretxabaleta, A. L. Biogeosciences, Vol. 11, Issue 24 https://doi.org/10.5194/bg-11-7193-2014	journal	January 2014
Spatial Characterization of Water Quality in Florida Bay and Whitewater Bay by Multivariate Analyses: Zones of Similar Influence Boyer, Joseph N.; Fourqurean, James W.; Jones, Ronald D. Estuaries, Vol. 20, Issue 4 https://doi.org/10.2307/1352248	journal	December 1997
Climate Change Projected Effects on Coastal Foundation Communities of the Greater Everglades Using a 2060 Scenario: Need for a New Management Paradigm Koch, M. S.; Coronado, C.; Miller, M. W. Environmental Management, Vol. 55, Issue 4 https://doi.org/10.1007/s00267-014-0375-y	journal	October 2014
PARAFAC. Tutorial and applications Bro, Rasmus Chemometrics and Intelligent Laboratory Systems, Vol. 38, Issue 2 https://doi.org/10.1016/S0169-7439(97)00032-4	journal	October 1997
Shifting N and P limitation along a north-south gradient of mangrove estuaries in South Florida Boyer, Joseph N. Hydrobiologia, Vol. 569, Issue 1 https://doi.org/10.1007/s10750-006-0130-3	journal	October 2006
Data Analysis Wickham, Hadley Use R! https://doi.org/10.1007/978-3-319-24277-4_9	book	June 2016
Monthly monitoring fluorescence data for Shark River Slough and Taylor Slough, Everglades National Park (FCE) for October 2004 to February 2014 Jaffe, Rudolf Environmental Data Initiative https://doi.org/10.6073/pasta/73cfe370fd8eebe5e53419acfa5282d5	dataset	January 2015
Monthly monitoring fluorescence data for Shark River Slough and Taylor Slough, Everglades National Park (FCE) for October 2004 to February 2014 Jaffe, Rudolf Environmental Data Initiative https://doi.org/10.6073/pasta/a3fbf8fc61fbe0603789a60f8ad7ac91	dataset	January 2018
Monthly monitoring fluorescence data for Shark River Slough and Taylor Slough, Everglades National Park (FCE) for October 2004 to February 2014 Jaffe, Rudolf Environmental Data Initiative https://doi.org/10.6073/pasta/3938d3bb664d57584afc749c6a768f31	dataset	January 2018

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