Dissolved Organic Matter Biogeochemistry Along a Transect of the Okavango Delta, Botswana

Variability in chemistry of surface and soil waters of an evapotranspiration-dominated flood-pulsed wetland: solute processing in the Okavango Delta, Botswana

“…The processes dominating the cycling of solutes in surface-and soil waters of the Delta, before they eventually precipitate or are sequestered in highly saline groundwater beneath island centres, are not fully understood, however. While there have been studies on water chemistry in the Okavango Delta (Sawula and Martins, 1991;McCarthy and Ellery, 1995;Cronberg et al, 1996a;Cronberg et al, 1996b;Mladenov et al, 2005;Bauer et al, 2007;Mackay et al, 2011;Cawley et al, 2012), the scope was primarily focused on concentrations of solutes in surface water and groundwater;…”

New perspectives on an iconic landscape from comparative international long‐term ecological research

“…The excitation emission matrix (EEM) fluorescence technique that was used to develop a parallel factor analysis (PARAFAC) model for the Ever-glades was strongly influenced by photo-degradation compared to bio-degradation, possibly as a result of P limitation. This FCE-based model was successfully applied to DOM studies in the Okavango Delta (Botswana; Cawley et al 2012b) and the Pantanal (Brazil) and suggested similarities in the DOM composition and reactivity across subtropical wetlands. Photochemical reactivity proxies established for Everglades DOM (Chen et al, 2010) were found to be equally applicable to the Okavango Delta DOM pool (Cawley et al 2012b).…”

“…This FCE-based model was successfully applied to DOM studies in the Okavango Delta (Botswana; Cawley et al 2012b) and the Pantanal (Brazil) and suggested similarities in the DOM composition and reactivity across subtropical wetlands. Photochemical reactivity proxies established for Everglades DOM (Chen et al, 2010) were found to be equally applicable to the Okavango Delta DOM pool (Cawley et al 2012b). In addition, we applied the EEM-PARAFAC approach in combination with stable C isotopes to both Florida Bay Ya et al 2015) and Shark Bay (Cawley et al 2012a) to assess the contribution of living and senescent seagrass to the DOM pool.…”

Linking Organic Matter Dynamics to Management, Restoration, and Climate in the Florida Everglades

“…EEM-PARAFAC has been used to trace changes in DOM source and reactivity (Cory & McKnight, 2005;Stedmon & Markager, 2005;), biological and photochemical processing (Fellman et al 2008;Chen and Jaffé 2014), impacts of land use (Williams et al 2010;) and anthropogenic influence in natural systems (Cawley et al 2012;Shutova et al 2014;Graeber et al 2015). Use of EEM-PARAFAC from the Arctic (Gueguen et al 2013;Walker et al 2013;Mann et al 2016) to the tropics (Cao et al 2016;Lambert et al 2016), and in headwater streams (Yamashita et al 2011;Burrows et al 2013;Hosen et al 2014), major rivers (Walker et al 2013;Cao et al 2016;Lambert et al 2016), wetlands (Fellman et al 2008;Cawley et al 2012;, estuaries (Stedmon & Markager, 2005;Osburn et al 2012;, and coastal and open oceans (Jorgensen et al 2011;Gueguen et al 2013;Kowalczuk et al 2013) (Murphy et al, 2014).…”

“…Use of EEM-PARAFAC from the Arctic (Gueguen et al 2013;Walker et al 2013;Mann et al 2016) to the tropics (Cao et al 2016;Lambert et al 2016), and in headwater streams (Yamashita et al 2011;Burrows et al 2013;Hosen et al 2014), major rivers (Walker et al 2013;Cao et al 2016;Lambert et al 2016), wetlands (Fellman et al 2008;Cawley et al 2012;, estuaries (Stedmon & Markager, 2005;Osburn et al 2012;, and coastal and open oceans (Jorgensen et al 2011;Gueguen et al 2013;Kowalczuk et al 2013) (Murphy et al, 2014).…”