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Esse Herrera, Carlos
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Esse Herrera, Carlos
Nombre oficial
Carlos Roberto Esse Herrera
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4 results
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- PublicationEffects of land use change on water availability and water efficiency in the temperate basins of south-central Chile(Elsevier B.V., 2021-12)
; ;Ríos, Ney ;Saavedra, Pablo ;Fonseca, David ;Encina-Montoya, Francisco ;Santander-Massa, Rodrigo ;de Los Ríos-Escalante, Patricio ;Figueroa-Muñoz, Guillermo ;López-Pérez, AdolfoBackground: Forest ecosystems provide services that are important for human use; one of the most critical ecosystem services is the provision and regulation of water. Basins with high forest improves hydrological functionality by promoting reduction in surface runoff, increase infiltration and aquifer recharge, and ensures base flow regulation amongst others. On the other hand, the conversion towards highly anthropized productive systems is usually accompanied by precarious environmental management that alters the hydrological cycle and reduction in water quality in basins. Aim: The goal of this study was to analyze land use changes and their effect on water efficiency index (WEI) in three sub-basins. Methodology: The methodology included a multi-temporal analysis of satellite images to identify land uses, also the use of SWAT (Soil and Water Assessment Tool) model for hydrological analysis in each sub-basin, information needed for calculating the WEI. Results: The results revealed the existence of no significant difference in terms of WEI between the sub-basins with predominant tree cover of native or artificial, being higher (0.89) than the WEI values reported by the sub-basin with agricultural land use (0.65). It is concluded that hydrological functions are more efficient in basins with forest cover, made up of native or exotic species, than agricultural land use with annual crop rotations. The results contribute to decision making on public policies associated to the rural productive activities. Concluded: Finally, we conclude the necessity of the promotion of forest plantation management techniques that avoid clear-cutting and multiple rotations in basin headwaters and riparian areas. - PublicationMicroplastic concentration, distribution and dynamics along one of the largest Mediterranean-climate rivers: A whole watershed approach(Academic Press Inc., 2022-06)
;Correa-Araneda, F. J. ;Pérez, Javier ;Tonin, Alan Mosele; ;Boyero, Luz ;Díaz, María Elisa ;Figueroa, Ricardo ;Santander-Massa, Rodrigo ;Cornejo, Aydeé ;Link, Oscar ;Jorquera, ErikaUrbina, M. A.Microplastics (MPs) have been recognized as one of the most ubiquitous environmental pollutants globally. They have been found in all ecosystems studied to date, threatening biological diversity, ecosystem functioning and human health. The present study aimed to elucidate the environmental and anthropogenic drivers of MP dynamics in the whole catchment of the Biobío river, one of the largest rivers in South America. MP concentration and characteristics were analysed in 18 sites subjected to different sources of pollution and other human-related impacts. The sampling sites were classified in relation to altitudinal zones (highland, midland and lowland) and ecosystem types (fluvial and reservoir), and different water and territorial environmental variables were further collated and considered for analysis. Seven types of microplastic polymers were identified in the samples analysed, with a catchment mean (±SE) MP concentration of 22 ± 0.4 particles m−3, and MP presence being significantly higher in lowlands (26 ± 2 particle m−3) and in reservoirs (42 ± 14 particle m−3). The most abundant type of MP was fragments (84%), with a mean concentration of 37 ± 6 particles m−3. Overall, MP concentrations were low compared to those found in other studies, with a strong influence of human population size. - PublicationStructure, diversity, and environmental determinants of high-latitude threatened conifer forests(MDPI AG, 2021)
; ;Correa-Araneda, F. J. ;Acuña, Cristian ;Santander-Massa, Rodrigo ;de Los Ríos-Escalante, Patricio ;Saavedra, Pablo ;Jaque-Jaramillo, Ximena ;Moreno-García, Roberto ;García-Meneses, Paola MassyelSoto, Daniel P.Pilgerodendron uviferum (D. Don) Florin is an endemic, threatened conifer that grows in South America. In the sub-Antarctic territory, one of the most isolated places in the world, some forest patches remain untouched since the last glaciation. In this study, we analyze the tree structure and tree diversity and characterize the environmental conditions where P. uviferum-dominated stands develop within the Magellanic islands in Kawésqar National Park, Chile. An environmental matrix using the databases WorldClim and SoilGrids and local topography variables was used to identify the main environmental variables that explain the P. uviferum-dominated stands. PCA was used to reduce the environmental variables, and PERMANOVA and nMDS were used to evaluate differences among forest communities. The results show that two forest communities are present within the Magellanic islands. Both forest communities share the fact that they can persist over time due to the high water table that limits the competitive effect from other tree species less tolerant to high soil water table and organic matter. Our results contribute to knowledge of the species’ environmental preference and design conservation programs. - PublicationExtension of the known distribution range and habitat use of the Tiger Crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae)(Asociacion Iberica de Limnologia, 2022)
; ;Jaque-Jaramillo, Ximena ;Saavedra, Pablo; ;Ulloa-Yáñez, Alfredo ;Martin, Juan ;de Los Ríos-Escalante, Patricio R. ;Boyero, Luz ;Ovalle, Katalina ;Santander-Massa, RodrigoFigueroa-Muñoz, GuillermoThe tiger crab Aegla concepcionensis Schmitt, 1942 (Decapoda, Aeglidae) is a threatened freshwater decapod, endemic of Chile, with significant gaps in knowledge about its biology and ecology. The aim of this work was to contribute to the knowledge of the ecology of A. concepcionensis, through the extension of its known distribution range, recorded in a new type of ecosystem, and the description of the physicochemistry, vegetation and benthic macroinvertebrate and microalgal communities of those sites, which provides information about habitat use of the species. Our results show the presence of A. concepcionensis until 270 km south of the previously described range and reveal that the species inhabits streams and lakes. A. concepcionensis is associated to environments with cold and temperate waters, well oxygenated, with neutral pH and low conductivity, and characterized by low anthropic intervention, which is reflected in the high proportion of native riverine plant species and the high diversity of macroinvertebrate and microalgal benthic communities. We conclude that the previously restricted known distribution range of this species was mainly due to low sampling effort or misidentifications. Our results indicate that anthropic intervention should be avoided or minimized in the distribution area of A. concepcionensis, especially in those areas associated with urban expansion and touristic activities in streams and lakes.