Synoptic Survey of Surface Water Isotopes and Nutrient Concentrations, Páramo High-Elevation Region, Antisana Ecological Reserve, Ecuador

Williams, Mark W.; Hood, Eran; Ostberg, Gustav; Francou, Bernard; Galárraga, Remigio

doi:10.1080/15230430.2001.12003447

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…For example, Osburn et al (2018) and Sánchez-Murillo et al (2019) reported stream DOC concentrations ranging from 7.65 up to 11.52 mg/L, respectively, during storm events in swamp primary and secondary forests of the Caribbean slope of central Costa Rica. Williams et al (2001) and Pesántez et al (2018) reported mean DOC concentrations in Páramo wetlands and natural forests of the Ecuadorian Andes of 23.0 and 11.0 mg/L, respectively. Dalmagro et al (2017) found significant DOC differences between the dry (∼2 mg/L) and wet (∼6 mg/L) seasons within the large Brazilian Pantanal wetland.…”

Section: Dissolved Carbon Content and Optical Propertiesmentioning

confidence: 99%

Exploring Dissolved Organic Carbon Variations in a High Elevation Tropical Peatland Ecosystem: Cerro de la Muerte, Costa Rica

et al. 2022

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Tropical peatlands are distributed mainly in coastal lowlands; however high elevation regions exhibit a large prevalence of small and fragmented peatlands that are mostly understudied. Artificial drainage of peatlands to expand the area of cattle farming, horticulture, and urbanization is increasing carbon losses to the atmosphere and streams worldwide. Here, we present an exploratory characterization of dissolved carbon optical properties in ombrotrophic peat bogs of the Talamanca range of Costa Rica, across an altitudinal gradient (2,400–3,100 m a.s.l.) during the rainy season. Dissolved organic matter (DOM) sources and decomposition processes were evaluated in the light of dissolved organic and inorganic carbon (DOC and DIC), optical properties, and major water chemistry. DOC concentrations ranged from 0.2 up to 47.0 mg/L. DIC concentrations were below 2 mg/L and δ13CDIC values indicated a mixture between soil organic matter, CO2 in soil water, and to a lesser degree DIC derived from bacterial CO2. Absolute fluorescence intensity of humic-like peaks was 6–7 times greater than fresh-like peaks across all sites. Fluorescence peak ratios coupled with the biological and humification indexes point to a greater relative contribution of recalcitrant soil-derived DOM. Excitation/Emission matrices denoted a high prevalence of humic and fulvic acids in the peat bogs, with moderate intensities in soluble microbial by-products-like and aromatic protein regions at three sites. Our data provides a baseline to underpin tropical carbon dynamics across high elevation peatlands.

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Section: Dissolved Carbon Content and Optical Propertiesmentioning

confidence: 99%

Exploring Dissolved Organic Carbon Variations in a High Elevation Tropical Peatland Ecosystem: Cerro de la Muerte, Costa Rica

et al. 2022

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Bofedal wetland and glacial melt contributions to dry season streamflow in a high‐Andean headwater watershed

Gribbin,

Mackay,

MacDonald

et al. 2024

Hydrological Processes

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In the context of expected future melt reductions in the high‐Andes, the buffering capacity of non‐glacial stores, and especially of high‐altitude bofedal wetlands, is of increasing importance. Isotope signatures potentially indicative of water undergoing evaporation on transit through bofedales have been found in the tropics, but end‐member uncertainty has so far prevented streamflow separation using this signal. We undertook a stable isotope sampling campaign over the 2022 wet‐dry season transition in a 53.6 km2, 16% glacierized catchment in southern Peru with a bofedal coverage of 11%. Diurnal proglacial hydrographs and remote sensing were used to interpret seasonal snowmelt dynamics and identify the dry periods when glacial melt and bofedal contributions are assessed to be the two principal components of streamflow. Following the final wet season precipitation event, a rapid ~3 week transition occurs in the main river from a stable isotope signature consistent with dynamic rainfall/snowmelt contributions to one of ice‐melt. In both wet and dry seasons, the main river and tributary streams show evaporative enrichment suggesting ongoing supply from water transiting bofedales. A two‐component mixing model using lc‐excess during the dry season shows the bofedal source contribution varies from 9% to 20% [±9–10%], indicating that streamflow is greatly augmented by the presence of glaciers at these headwater scales. However, applying these proportions to river discharge shows a sustained bofedal contribution of around 0.09 m3/s during the dry season study window whereas the flux of glacial water halves from 0.73 to 0.36 m3/s over this timeframe. The results highlight the important role of bofedales and the connected groundwater system in buffering seasonal declines in streamflow months into the dry season, and suggests the hydrological functioning of bofedales as part of this wider system should be considered when exploring the effectiveness of potential options to sustain baseflows in a post‐glacial future.

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Frontiers in páramo water resources research: A multidisciplinary assessment

Mosquera

Hofstede

Bremer

et al. 2023

Science of The Total Environment

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Synoptic Survey of Surface Water Isotopes and Nutrient Concentrations, Páramo High-Elevation Region, Antisana Ecological Reserve, Ecuador

Cited by 6 publications

References 34 publications

Exploring Dissolved Organic Carbon Variations in a High Elevation Tropical Peatland Ecosystem: Cerro de la Muerte, Costa Rica

Exploring Dissolved Organic Carbon Variations in a High Elevation Tropical Peatland Ecosystem: Cerro de la Muerte, Costa Rica

Bofedal wetland and glacial melt contributions to dry season streamflow in a high‐Andean headwater watershed

Frontiers in páramo water resources research: A multidisciplinary assessment

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