
Mariela A. YevenesUniversity of Concepción · Aquatic Systems Unit
Mariela A. Yevenes
PhD
About
21
Publications
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Introduction
Mariela A. Yevenes currently works at University of Concepción. Mariela A. does research in Water Science. Their most recent publication is 'Seasonal drought effects on the water quality of the Biobío River, Central Chile'.
Publications
Publications (21)
Nature-based solutions (NBSs) offer environmentally rational, socially acceptable, and economically viable alternatives for solving diverse water issues. Therefore, the involvement of local communities is crucial, as their participation in developing shared knowledgewithin their territories is essential for building and sustaining resilient ecosyst...
It is becoming increasingly clear that the threat to the use of natural landscapes and persistent droughts are affecting the water quality of rural communities. The socio-ecological fit emerges as an aid to advance in the search for solutions to environmental problems in rural communities. Consequently, between May 2016 and September 2021, an inter...
Abstract Background Although intermittent rivers account for over half of the global fluvial network and could increase in length and quantity in Mediterranean climates (in response to climate changes), there is little documentation of organic matter input to them. This study was made possible by the cooperation of the Concepción Chiguayante School...
This study investigates the immediate and mid-term effects of the biogeochemical variables input into the Reloncaví fjord (41°40′S; 72°23′O) as a result of the eruption of Calbuco volcano. Reloncaví is an estuarine system supporting one of the largest mussels farming production within Northern Chilean-Patagonia. Field-surveys were conducted immedia...
Using in situ hydro-chemical data and MODIS-SeaWiFS ocean color images as a proxy of river plumes and phytoplankton biomass from 2000 to 2014, this study documents the temporal co-variability of river discharge, plume area, nitrate and phosphate export and phytoplankton biomass in the coastal waters off Central Chile (33°–37°S). Five major rivers (...
Quantifying the effect of droughts on ecosystem functions is essential to the development of coastal zone and river management under a changing climate. It is widely acknowledged that climate change is increasing the frequency and intensity of droughts, which can affect important ecosystem services, such as the regional supply of clean water. Very...
Within the earth’s atmosphere, methane (CH4) is one of the most important absorbers of infrared energy. It is recognized that coastal areas contribute higher amounts of CH4 emission; however, there is a lack of accurate estimates for these areas. This is particularly evident within the extensive northern fjord region of Chilean Patagonia, which has...
Fjords and estuaries exchange large amounts of solutes, gases, and particulates between fluvial and marine systems. These exchanges and their relative distributions of compounds/particles are partially controlled by stratification and water circulation. The spatial and vertical distributions of N2O, an important greenhouse gas, along with other oce...
The identification of nitrate-nitrogen (NO3–N) origin is important in the control of surface and ground water quality. These are the main sources of available drinking water. Stable isotopes (15N and 18O) for NO3–N and along with a 1-D reactive transport model were used to study the origin and processes that lead to nitrogen transformation and loss...
Identifying the key anthropogenic (land uses) and natural (topography and climate) biophysical drivers affecting river water quality is essential for efficient management of water resources. We tested the hypothesis that water quality can be predicted by different biophysical factors. Multivariate statistics based on a geographical information syst...
Sequías de uno o dos años han afectado de manera recurrente la zona central de Chile durante su historia, asociadas a variaciones climáticas de origen natural. Ocasionalmente, el déficit hídrico ha superado el 50% (como sucedió en los años 1925, 1968 y 1989) impulsando la construcción de embalses, la creación de subsidios agrícolas y otras medidas...
The knowledge of water source contributions to streamflow is important for understanding chemical contamination origins and the status of biogeochemical cycling in stream networks of catchments. In this study, we evaluated whether a limited number of spatially distributed geochemical tracer data sampled during different hydrological seasons were su...
Stream nitrate nitrogen exports are an important indicator of agricultural impacts on aquatic health in catchments. Quantitative assessment of factors and processes affecting stream nitrate loadings is complex because of the large number of causal factors and processes, such as weather and rainfall, catchment hydrological behavior, soils, land use...
Stable water isotopes and water hydrochemistry of a catchment in the Alentejo region, south Portugal, were analysed to investigate source origins of water and nitrate flows towards a reservoir. The 353 km<sup>2</sup> headwater catchment of Roxo river, is strongly influenced by agricultural impacts, and high variations in water and chemical inflows...
This study explores the use of delta15N and delta18O isotopes of dissolved nitrate, ion tracers (NO3-,Cl- and SO4-) and oxygen analysis in surface water from a stream network of an agricultural catchment (352 km2), located in the semi arid Alentejo region in Portugal. From this agricultural catchment, water accumulates into a dam that provides wate...
Control of diffuse pollution, caused particularly by agriculture activities, has posed effort in all EU Member Countries with most countries facing problems with the implementation of the EU Nitrate Directive (91/676/EEC). In Portugal, a considerable number of areas have been classified as "vulnerable zones" of nitrate contamination from agricultur...
The study on the toxicity of chitosan diethyl phosphate (ChDP), a controlled release insecticide, on the activities of butyrylcholinesterase (BuChE) and acetylcholinesterase (AChE) in rainbow trout exposed to this pesticide was carried out. It was found that ChDP reduced BuChE activity in O. mykiss by a factor of eight at 6 days, with high fluctuat...
Iron and sulfur isotope variations in modern microbial mats from the
hypersaline ponds of the Guerrero Negro salt works, Baja California
Sur, Mexico have been investigated. Cyanobacteria are the primary
producers of this mat ecosystem. The oxygen concentrations in the
surface 2 mm of the mats alternate between oxygen-rich and oxygen-free
over a die...
The increase in trace metals concentrations (mercury, lead, cadmium, copper, chromium and zinc) in sediment cores from three Andean lakes, located along a latitudinal gradient were determined (Chungará, Laja and Castor lakes). Samples were obtained in the deepest part of each lake, using a gravity corer model Kayac. The sediment cores were vertical...
The increase in trace metals concentrations (mercury, lead, cadmium, copper, chromium and zinc) in sediment cores from three Andean lakes, located along a latitudinal gradient were determined (Chungará, Laja and Castor lakes). Samples were obtained in the deepest part of each lake, using a gravity corer model Kayac. The sediment cores were vertical...