4 research outputs found
Development of automatic sensing system for water flow based on noncontact pointer with self-sustaining capacitance signal principle
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Ecological niche model to predict the potential distribution of phytoplankton in the Aguamilpa Dam, Nayarit. Mexico
Get PDFPhytoplankton species are an important basis of the food web for various systems such as pelagic, coastal and lake. Due to their photosynthetic capacity, this community is sensitive to changes in light availability, temperature, nutrient concentrations, herbivores consumption, parasitism and competition. Therefore, they show a high spatial and temporal variability related to environmental changes both natural and anthropogenic. However, as any taxonomic group, phytoplankton species have environmental thresholds, ecological niches that define their distribution. This study was located in Aguamilpa Dam, an artificial aquatic reservoir which started operations in 1994 for electric energy production. In this system the potential distribution of the phytoplankton was evaluated, where the highest species richness and restricted distribution areas were identified. Potential distribution models based on ecological niche definition were generated using ArcMap 9.2® with Maxent (Maximun Entropy Method). The development of distribution maps was carried out using Digital Elevation Models in cells of 100 m x 100 m (1 ha), based on nine physico-chemical and biological water parameters monitored in the reservoir. The highest species richness areas were found in the Huaynamota river tributary and at the station called La Confluencia, while the less abundance areas were found in the Santiago river tributary during warm and cold dry seasons with a great abundance of cyanophyta. During the rainfall season, the Huaynamota river tributary diversity areas were extended and the presence of some dominant species of cyanophyta were indentified. These species can be associated with trophic processes related to anthropogenic pollutants in the reservoir. This study illustrates the potential application of niche modeling approach in aquatic ecosystems
Ecological niche model to predict the potential distribution of phytoplankton in the Aguamilpa Dam, Nayarit. Mexico (doi:10.4136/ambi-agua.154) (Spanish)
No full textGenetic structure in a sample of the human population in the Colombian Orinoquía
No full textilustraciones, graficasSe realizo un estudio de caracterización de una muestra de la Orinoquía colombiana, esto como parte del macroproyecto que lleva a cabo el grupo de genética de poblaciones e identificación de la Universidad Nacional de Colombia. Se utilizaron tres tipos de marcadores para esta tarea incluyendo STRs, INDELs y cromosoma Y, los resultados son concordantes con descripciones previas donde la población de la Orinoquía es genéticamente similar a las poblaciones de la región andina, esta noción contrasta con el modelo de poblamiento establecido por Tarazona-Santos, donde poblaciones del oriente del sur del continente sur americano y la región andina difieren por patrones de diversidad. Los resultados expuestos podrían extender el modelo Tarazona-Santos de las regiones de la cordillera oriental a la región de la Orinoquía ajustado a patrones biogeográficos. Adicionalmente considerando la cercanía genética de estas poblaciones, es llamativa las divergencias en otros aspectos como los biogeográficos y bioculturales, por lo cual se propone una línea de análisis basada en aspectos propios de las culturas para una compresión holística de las poblaciones. (Texto tomado de la fuente)A characterization study of a sample from the Colombian Orinoquía was carried out as part of the macroproject carried out by the population genetics and identification group of the National University of Colombia. Three types of markers were used for this task including STRs, INDELs and Y chromosome, the results are consistent with previous descriptions where the population of the Orinoquía is genetically similar to the populations of the Andean region, this notion contrasts with the established population model by Tarazona-Santos, where populations from the south east of the South American continent and the Andean region differ by patterns of diversity. The exposed results could extend the Tarazona-Santos model from the regions of the Eastern Cordillera to the Orinoquía region adjusted to biogeographical patterns. Additionally, considering the genetic proximity of these populations, the divergences in other aspects such as biogeographical and biocultural are striking, for which a line of analysis based on aspects of cultures is proposed for a holistic understanding of populations.MaestríaMagíster en Genética HumanaGenética de poblaciones y genética human
