Browsing by Author "d1704d50-7d64-4adb-aca0-ddf13344621f"
Now showing items 1-20 of 53
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Artificial neural networks applied to quantitative elemental analysis of organic material using PIXE
(ELSEVIER, 2006-08)An artificial neural network (ANN) has been trained with real-sample PIXE (particle X-ray induced emission) spectra of organic substances. Following the training stage ANN was applied to a subset of similar samples thus ... -
Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
(2007)Rape] reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial ... -
Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
(2007)Rape] reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial ... -
Bacterioplankton composition in tropical high elevation lakes of the Andean plateau
(Oxford University Press, 2018)High-elevation lakes in the tropics are subject to extreme environmental fluctuations and microbes may harbor a unique genomic repertoire, but their composition and diversity are largely unknown. Here, we compared the ... -
Bacterioplankton composition in tropical high-elevation lakes of the Andean plateau
(Oxford University Press, 2018)© FEMS 2018. High-elevation lakes in the tropics are subject to extreme environmental fluctuations and microbes may harbor a unique genomic repertoire, but their composition and diversity are largely unknown. Here, we ... -
Caracterización trófica de Orestias (Teleostei: Cyprinodontidae) en el Parque Nacional Lauca
(Universidad de Concepción. Facultad de Ciencias Naturales y Oceanográficas., 2015)Los peces muestran una amplia diversidad de comportamientos alimentarios, algunas veces asociados con morfologías específicas, las cuales pueden reflejar adaptaciones para usar los recursos dependiendo de su hábitat. En ... -
Chromosomal organization of four classes of repetitive DNA sequences in killifish Orestias ascotanensis Parenti, 1984 (Cyprinodontiformes, Cyprinodontidae)
(Pensoft Publishers, 2017)Orestias Valenciennes, 1839 is a genus of freshwater fish endemic to the South American Altiplano. Cytogenetic studies of these species have focused on conventional karyotyping. The aim of this study was to use classical ... -
Ciclo de vida de un poliqueto dulceacuícola de origen Gondwánico Stratiodrilus Aeglaphilus (Annelida: Eunicida: Histriobdellidae), comensal de Aegla laevis (Crustacea: Anomura) Life cycle of a freshwater Gondwanic remnant polychaete Stratiodrilus aeglaphi
(Universidad de Concepcion, 2014)© 2014, Universidad de Concepcion. All rights reserved. Within the Annelida phylum, the Histriobdellidae Family groups freshwater polychaetes sharing an ancient Gondwanic relationship; very little is known about their life ... -
Competitive interaction between introduced rainbow trout and native silverside in a Chilean stream
(Springer Netherlands, 2009)The field experiment presented here elucidates the competitive effect of exotic trout on Chilean silverside. This is the first local experimental work that demonstrates the negative effect of trout on native fish from ... -
Cyanobacterial diversity in Salar de Huasco, a high altitude saline wetland in northern Chile: an example of geographical dispersion?
(BLACKWELL, 2008-06)The diversity of Cyanobacteria in water and sediment samples from four representative sites of the Salar de Huasco was examined using denaturing gradient gel electrophoresis and analysis of clone libraries of 16S rRNA gene ... -
Demographic response of Stratiodrilus aeglaphilus (Anelida, Histriobdellidae) to organic enrichment: experimental assessment
(SPRINGER, 2007-09-09)Demographic responses of a commensal annelid of freshwater crayfish, Stratiodrilus aeglaphilus, to a sublethal organic enrichment were tested. Censuses of the S. aeglaphilus population were performed every 3 days during ... -
Differential gene expression revealed with RNA-Seq and parallel genotype selection of the ornithine decarboxylase gene in fish inhabiting polluted areas
(Nature Publishing Group, 2018)How organisms adapt to unfavorable environmental conditions by means of plasticity or selection of favorable genetic variants is a central issue in evolutionary biology. In the Maipo River basin, the fish Basilichthys ... -
Effect of zinc and benzalkonium chloride on Nitrosomonas communis and potential nitrification in soil
(2001)A bacterial contact assay is described which uses a chemoautotrophic microorganism, Nitrosomonas communis (strain Nm2) to evaluate the biological effect of contaminated soils. The effects of two toxicants on the ammonium ... -
Effects of a Dam Reservoir on the Distribution of Heavy Metals in Two Chilean Native Freshwater Fish Species
(Springer, 2016)In order to determine the effect of a dam on metal concentrations in riverine fish species, we studied fish inhabiting the influent (Cachapoal River) and effluent (Rapel River) of the Rapel Reservoir in central Chile. Heavy ... -
Effects of Cu+2 and pH on the fitness of Ceriodaphnia dubia (Richard 1894) (Crustacea, Cladocera) in microcosm experiments
(2001)An important disturbance of anthropogenic origin frequently occurring in freshwater ecosystems is a rise in the concentration of heavy metals in solution, among which copper stands out due to its known toxicity. However, ... -
Extremophiles: photosynthetic systems in a high-altitude saline basin (Altiplano, Chile)
(Springer Verlag, 2016)© 2016, The Author(s). Studies of different hypersaline systems have revealed various types of limitation. We evaluated the phototrophic microbial assemblages over a whole seasonal cycle (wet vs dry) in the Salar de Alconcha, ... -
Freshwater fishes of the Altiplano
(2007)Fisheries of the Altiplano, dating from 1500 to 2000 BC, are active in the Andean inter-montane plateau that extends from Ancash, Peru, to Antofagasta, Chile, at altitudes above 3600 m. The ancient and remote nature of ... -
Genetic structure in remnant populations of an endangered cyprinodontid fish, Orestias ascotanensis, endemic to the Ascotán salt pan of the Altiplano
(2011)The impact of recent habitat fragmentation on population genetic diversity and structure has often been studied, mainly related to anthropogenic causes; however its long-term effect has been much less evaluated. In this ... -
Geographical isolation and genetic differentiation: the case of Orestias ascotanensis (Teleostei: Cyprinodontidae), an Andean killifish inhabiting a highland salt pan
(WILEY-BLACKWELL, 2016)Orestias ascotanensis is a killifish endemic to the Ascotan salt pan in the Chilean Altiplano, where it inhabits 12 springs with different degrees of isolation. This species is a suitable model for studying the effect of ... -
Geothermal diatoms: seasonal variability in the El Tatio geothermal field (Altiplano, Chile)
(Scientific Research Publishing, 2018)Diatom floras were examined in a high-altitude geothermal field, 4200 - 4500 m (29 degrees 19'S 68 degrees W'), located in the Central Andean dry Puna ecoregion or southern Altiplano. These locations include hostile ...
