Characterisation of dissolved organic matter from temperate wetlands: field dynamics and photoreactivity changes driven by natural inputs and diagenesis along the hydroperiod

García, Pérez; Ferro, Carolina F. Mansilla; Diéguez, María del Carmen

doi:10.1080/00288330.2022.2064882

Cited by 3 publications

(2 citation statements)

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“…Our results showed that lake DOM pools responded uniformly to decreasing precipitation and warming, resulting in a decrease in DOM molecular weight/size and aromaticity, and an increase in degradation signatures. Such trends have been observed in other lakes of north Andean Patagonia(Garcia et al, 2022;…”

supporting

confidence: 79%

“…The C1 corresponds to the fluorescent peaks A + M and is attributed to terrestrial sources and microbial processing and the C2 corresponds to the peaks A + C from terrestrially‐derived humic compounds. The non‐humic component C3, corresponding to the T peak, could represent small molecules (i.e., phenols) product of the degradation of high molecular weight DOM and/or protein‐like compounds derived from the aquatic production and/or fresh leachates (Table S4 and references therein; Maie et al., 2007; Garcia et al., 2022).…”

Section: Resultsmentioning

confidence: 99%

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Bioclimatic influence on water chemistry and dissolved organic matter in shallow temperate lakes of Andean Patagonia: A gradient approach

Mansilla Ferro,

Garcia,

Reissig

et al. 2024

Freshwater Biology

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We addressed the influence of bioclimatic variables (precipitation, temperature and vegetation) on physicochemical properties, carbon (C) and nutrients dynamics in shallow temperate lakes in the northern Patagonian Andes. Four shallow lakes (mean depth < 15 m) located along the Andean Patagonian bioclimatic gradient, and characterised by a west‐to‐east decrease in precipitation, increase in temperature and changes in vegetation type, were studied during wet and dry periods. Physicochemical variables, total nitrogen and phosphorus (TN and TP) and particulate and dissolved organic matter (POM and DOM) were analysed. Multivariate analyses were performed to evaluate the influence of environmental variables on lake water chemistry and to identify the main factors associated with spatial and temporal differences in lake DOM pools. Spatial and seasonal decreases in precipitation and warming were reflected in reduced hydrological connectivity of the lakes. The reduced connectivity resulted in increased conductivity, pH, alkalinity, dissolved organic carbon (DOC) and TN concentrations. Such conditions favoured the loss of lake DOM aromaticity, humic content and molecular weight/size, and increased the degradation signals and the biologically produced DOM fraction. Lakes responded uniformly to changes in climate variables along the Andean Patagonian gradient. Differences among lakes in water chemistry and DOM composition, were associated at the gradient scale with variation in precipitation, temperature and catchment vegetation, which may provide insights into C and water chemistry trajectories under forecasted climate trends. Our results suggest that drought and warming trends could result in less hydrological connectivity, shrinking terrestrial DOM fluxes to lakes while concomitantly increasing internal degradation processes.

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confidence: 79%

Section: Resultsmentioning

confidence: 99%