Ramón Ahumada-Rudolph

University of Bío-Bío

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Vanessa Novoa

University of Tarapacá

Anny Rudolph

Pontificia Universidad Católica de Chile

Octavio Rojas

University of Concepción

Jaime R. Cabrera‐Pardo

University of Bío-Bío

Ramón Ahumada

Pontificia Universidad Católica de Chile

Carolina Rojas

Centre For Sustainable Urban Development

José Becerra

University of Concepción

Katia Sáez

University of Concepción

José Luis Arumí

University of Concepción

Gary R. Fones

University of Portsmouth

Cooperative Institutions

University of Concepción

University of Bío-Bío

University of Chile

Pontificia Universidad Católica de Chile

Universidad Católica de la Santísima Concepción

Austral University of Chile

University of Siena

Environment and Climate Change Canada

Universidad de La Laguna

Universidad de La Frontera

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A temporal analysis of the consequences of the drought regime on the water footprint of agriculture in the Guadalupe Valley, Mexico

Scientific Reports (2024)

Vanessa Novoa Carolina Rojas Octavio Rojas Ramón Ahumada-Rudolph Rebeca Moreno-Santoyo

Abstract Changes in water availability have a substantial impact on the sustainability and maintenance of agriculture, with water footprint (WF) being a robust methodology to assess these transformations. The Guadalupe Valley is one of the places with the highest agricultural production in Mexico. Despite its semi-arid climatic conditions, it provides high-quality crops that are well-positioned in the world. The historical trend of rainfall and temperatures between 1987 and 2017 was analyzed to identify climatic patterns in the territory. Through the calculations of the water footprint of Grapevine and Olive crops, the sensitivity of the crops to recurrent water deficit and their adaptation in their yields to drought episodes was identified. The reduction in precipitation and occurrence of extreme temperatures have contributed significantly towards augmenting crop evapotranspiration and, consequently, intensifying crop irrigation demands. As a result, there has been an apparent increase in the consumption of WF agricultural since 2007. Thus, the period of highest WF agricultural consumption was 2014 (Extremely dry), as opposed to 2011 (Very wet). In particular, the lowest WF green consumptions were observed in extremely dry years, that is, > 20% of the WF agricultural intensifying drought events. Therefore, these periods were compensated with higher uses of WF blue and WF gray , which are inversely correlated with precipitation, where vine crops consume 73% more WF agricultural compared to olive plantations, showing greater interannual variability. These results contribute to analyzing the temporal evolution of water consumption for agriculture, providing a basis for rational water use strategies.

Water use

Footprint

Vine

10.1038/s41598-024-56407-5

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Citations (4)

Coastal Wetlands: Ecosystems Affected by Urbanization?

Water (2020)

Vanessa Novoa Octavio Rojas Ramón Ahumada-Rudolph Katia Sáez Pablo Fierro

Coastal wetlands are ecosystems that provide multiple benefits to human settlements; nonetheless, they are seriously threatened due to both a lack of planning instruments and human activities associated mainly with urban growth. An understanding of their functioning and status is crucial for their protection and conservation. Two wetlands with different degrees of urbanization, Rocuant-Andalién (highly urbanized) and Tubul-Raqui (with little urbanization), were analyzed using temperature, salinity, dissolved oxygen, pH, turbidity, granulometry, fecal coliform, and macroinvertebrate assemblage variables in summer and winter. In both wetlands marked seasonality in salinity, temperature and sediment texture classification, regulated by oceanic influence and changes in the freshwater budget, was observed. In the Rocuant-Andalién wetland, the increases in pH, dissolved oxygen, gravel percentage, and coliform concentration were statistically significant. Urbanization generated negative impacts on macroinvertebrate assemblage structure that inhabit the wetlands; greater richness and abundance (8.5 times greater) were recorded in the Tubul-Raqui wetland than in the more urbanized wetland. The multivariate statistical analysis reflects the alteration of these complex systems.

10.3390/w12030698

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Citations (29)

Dissolved trace metals in the water column of Reloncavi Fjord, Chile

Latin American Journal of Aquatic Research (2011)

Ramón Ahumada Anny Rudolph Jean‐Paul Gonzalez Gary R. Fones Gonzalo Saldias

We analyzed the concentration of dissolved trace metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb) in the water column of Reloncaví Fjord. Sampling was performed during the CIMAR 12 Fiordos cruise in 2006. A total of 36 passive samplers or DGTs (diffusion gradient in thin films) were anchored at four stations along the longitudinal axis of the fjord. The DGTs were deployed at three depths per station and left there for 48 h. The metal contents on each thin film were analyzed using inductively coupled plasma atomic emission spectroscopy. Concentrations were highest in the surface layer at the head of the estuary, which is directly influenced by Petrohué River. Characteristic sequences of the studied metals were defined in the area with the greatest continental influence (Z (5-25 m) = Cu >Mn> Fe > Ni >Pb> Cr > Cd > Co) and in the area with a marine or coastal influence (Z (5-25 m) = Fe > Cu>Mn> Ni >Pb> Cr > Cd > Co). A similar metal sequence was found in the deepest layer: Z (40 m) = Fe >Mn> Cu >Pb> Ni > Cd > Cr > Co. The passive sampling technique using DGTs to determine dissolved trace metals in the sea water provided robust information on the concentrations of the ten metals analyzed.

Fjord

Trace metal

10.3856/vol39-issue3-fulltext-16

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Citations (7)

Dissolved trace metals in the water column of Reloncaví Fjord, Chile Metales trazas disueltos en la columna de agua en el fiordo Reloncaví, Chile

DOAJ (DOAJ: Directory of Open Access Journals) (2011)

Ramón Ahumada Anny Rudolph Elizabeth González Gary R. Fones Gonzalo S. Saldías

Fjord

Source

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Citations (0)

Sustainability assessment of the agricultural water footprint in the Cachapoal River basin, Chile

Ecological Indicators (2018)

Vanessa Novoa Ramón Ahumada-Rudolph Octavio Rojas Juan Munizaga Katia Sáez

Water use

Scarcity

10.1016/j.ecolind.2018.10.048

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Citations (67)

Hongos aislados desde sedimentos de fiordos chilenos degradadores de oxitetraciclina

Revista de biología marina y oceanografía (2016)

Ramón Ahumada-Rudolph Vanessa Novoa Anny Rudolph Miguel Martínez Cristian Torres‐Díaz

It is proposed that marine fungi are a good alternative for remediation of areas contaminated with antibiotics due to their heterotrophic condition, adaptability to environmental changes, and specific resistance to stressors.With this assumption we investigated the fjords of Southern Chile, which are characterized by salmon farming.We evaluated the concentration of oxytetracycline (OTC) in sediments from different areas surrounding salmon cages.In addition, we isolated fungi species to assess their ability to degrade OTC.Measurable amounts of OTC were detected in deeper sediments located at the eastern sector of cages and rafts (Z= 100 m; 4.62 ± 0.12 to 24.1 ± 1.03 µg g -1 ).Thirty-eight strains of endemic fungi were isolated and identified in the sediments near the farming center.Among these strains we detected species from the Phylum Ascomycetes, including Penicillium commune, Aspergillus terreus, Beauveria bassiana, Trichoderma harzianum, Epicoccum nigrum and Emericellopsis alkaline.These strains fungi were capable of degrading about 76 to 92% of the OTC present in the culture media.The results of this study constitute a first step into implementing processes that could favor waste bioremediation from marine sediments.

10.4067/s0718-19572016000300010

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Diversity of Agaricomycetes in southern South America and their bioactive natural products

Natural Product Research (2023)

Jonhatan Gómez-Espinoza Cristian Riquelme Enzo Romero-Villegas Ramón Ahumada-Rudolph Vanessa Novoa

Fungi have a unique metabolic plasticity allowing them to produce a wide range of natural products. Since the discovery of penicillin, an antibiotic of fungal origin, substantial efforts have been devoted globally to search for fungal-derived natural bioactive products. Andean region forests represent one of the few undisturbed ecosystems in the world with little human intervention. While these forests display a rich biological diversity, mycological and chemical studies in these environments have been scarce. This review aims to summarise all the efforts regarding the chemical or bioactivity analyses of Agaricomycetes (Basidiomycota) from southern South America environments. Overall, herein we report a total of 147 fungal species, 21 of them showing chemical characterisation and/or biological activity. In terms of chemical cores, furans, chlorinated phenol derivatives, polyenes, lactones, terpenes and himanimides have been reported. These natural products displayed a range of biological activities including antioxidant, antimicrobial, antifungal, neuroprotective and osteoclast-forming suppressing effects.

Agaricomycetes

Digitization

10.1080/14786419.2023.2244126

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Citations (3)

Marine fungi isolated from Chilean fjord sediments can degrade oxytetracycline

Environmental Monitoring and Assessment (2016)

Ramón Ahumada-Rudolph Vanessa Novoa Katia Sáez Mercedes Martı́nez Anny Rudolph

Trichoderma harzianum

Trichoderma

Ecotoxicity

10.1007/s10661-016-5475-0

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Citations (19)

Advancing Agricultural Sustainability: Nanoparticles and Modified Zeolites for Pathogenic Fungi Control and Seed Germination Enhancement

Ramón Ahumada-Rudolph Manuel Nova Vanessa Novoa Judith Vergara-Figueroa Paola Méndez

10.2139/ssrn.5129436

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Consequences of drought regimes on the water footprint of agricultural production. Temporal analysis of the Guadalupe Valley, Mexico.

Research Square (Research Square) (2023)

Vanessa Novoa Carolina Rojas Octavio Rojas Ramón Ahumada-Rudolph Rebeca Moreno-Santoyo

Abstract Changes in water availability have a strong impact on the sustainability and maintenance of agriculture, with water footprint (WF) being a robust methodology to assess these transformations. The Guadalupe Valley is one of the places with the highest agricultural production in Mexico. Despite its semi-arid climatic conditions, it provides high-quality crops that are well-positioned in the world. The historical trend of rainfall and temperatures between 1987-2017 was analyzed with the purpose of identifying climatic patterns in the territory. Through the calculations of the water footprint of Grapevine and Olive crops, the sensitivity of the crops to recurrent water deficit and their adaptation in their yields to drought episodes was identified. The decrease in rainfall and extreme temperatures led to an increase in crop evapotranspiration and crop irrigation requirements. As a result, there has been a clear increase in the consumption of WF agricultural since 2007. Thus, the period of highest WF agricultural consumption was 2014 (Extremely dry), as opposed to 2011 (Very wet). In particular, the lowest WF green consumptions were observed in extremely dry years, that is, >20% of the WF agricultural intensifying drought events. Therefore, these periods were compensated with higher uses of WF blue and WF gray , which are inversely correlated with precipitation, where vine crops consume 73% more WF agricultural compared to olive plantations, showing greater interannual variability. These results contribute to crop diversification, land use planning, water consumption efficiency, and drought risk reduction.

Water use

Olive trees

Agricultural diversification

10.21203/rs.3.rs-3318458/v1

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Citations (1)