Papers by Cesar Alejandro Berlanga Robles
Revista de Biología Tropical, 1969
Se determinó el espectro trófico de la tilapia Oreochromis aureus (Steindachner 1864), a través d... more Se determinó el espectro trófico de la tilapia Oreochromis aureus (Steindachner 1864), a través del análisis del contenido estomacal de una muestra de 153 especí¡nenes recolectados durante 1993. El estado de alimentación se evaluó por la proporción de grasa alrededor del estomago
Latin American Journal of Aquatic Research, 2016
This paper analyzes inter-annual (1993-2008) and intra-annual (2006-2008) flooding patterns in th... more This paper analyzes inter-annual (1993-2008) and intra-annual (2006-2008) flooding patterns in the unregulated San Pedro River, based on digital analysis of two Landsat satellite imagery series and ancillary rainfall and discharge data, to describe variations in the natural pulse. The long-term pattern, over a period of 16 years, showed considerable fluctuations, with a maximum flood extent (FE) of approximately 200 km 2 , while the observed average was 57.8 km 2 over the entire period, around 24 km 2 the dry season and more than 90 km 2 in the rainy season. The seasonal variation, analy zed using 29 quasi-monthly images recorded from 2006 to 2008, displayed FE peaks in the rainy season (July to October) with variations in time and extent that were not directly related to rainfall but instead were related to river discharge, Q, (FE = y0 + a(1-0.9983 Q); R 2 = 0.91). We used the above exponential model with monthly average river discharge data (1944-2008) and the proposed regulated volume of discharge from governmental plans to construct a dam on the San Pedro River. We found that the natural ecosystem will be altered by increasing the inundation in the dry season and reducing it in the rainy season. This change will have consequences in coastal wetlands and aquatic biota adapted to historical conditions, with consequences for the production of aquatic organisms and for ecosystem services.
Environmental Modelling & Software, 2011
This article presents a raster-based Geographic Information Systems (GIS) tool called CN-Idris th... more This article presents a raster-based Geographic Information Systems (GIS) tool called CN-Idris that outputs runoff estimates from land use/land cover and hydrologic soil group maps based on the Natural Resources Conservation Service Curve Number method. The tool enables the user to select among three antecedent moisture conditions and two values of the initial abstraction (I a) parameter, and it has the option to include spatial variation in rainfall input.
Revista de Investigaciones Marinas, 2008
Se presenta un inventario de los humedales costeros del sistema Altata-Ensenada del Pabellon, loc... more Se presenta un inventario de los humedales costeros del sistema Altata-Ensenada del Pabellon, localizado en el golfo de California, Mexico, realizado a partir de la clasificacion no supervisada de imagenes Landsat TM del 2005 y la digitalizacion de datos auxiliares. El mapa tematico de los humedales del sistema, representando cinco humedales naturales y dos humedales antropogenicos, se produjo con una exactitud total de 94% y con un valor del estimador del coeficiente de Kappa (K’) de 0.92. Pese a lo anterior algunas clases fueron clasificadas con exactitudes moderadas y bajas. El conjunto de humedales del sistema se extiende sobre 224 000 ha, de las que el 60% corresponden a la franja costera marina y el 40% se situa sobre la franja intermareal. Se describen los patrones espaciales de los humedales naturales por medio de metricas del paisaje. De estas, la dimension fractal perimetro-area presento valores indicadores de parches co n formas complejas, caracteristicas de humedales con...
Wetlands, 2010
This study contributes to the worldwide effort to update the status of mangroves, assessing a lar... more This study contributes to the worldwide effort to update the status of mangroves, assessing a large mangrove distribution area in Mexico by analyzing Landsat MSS from the early 1970s and TM imagery from 2005. Four states (Baja California Sur, Sonora, Sinaloa, and Nayarit) integrate the northwest region of Mexico, where the mangrove area was estimated to be around 180,000 ha on
Revista de biología …, 1997
Investigaciones Geograficas No 066, Sep 13, 2011
Environmental Modelling Software, Dec 1, 2011
Landscape Ecology, 2003
Coastal land use and land cover changes, emphasizing the alterations of coastal lagoons, were ass... more Coastal land use and land cover changes, emphasizing the alterations of coastal lagoons, were assessed in northwest Mexico using satellite imagery processing. Supervised classifications of a Landsat series and the coefficients Kappa (K) and Tau (), were used to assess the area and verify the accuracy of the classification of six informational classes (urban area, aquatic systems, mangrove, agriculture, natural vegetation, and aquaculture). Pixel-by-pixel change detection among dates was evaluated using the Kappa Index of Agreement (KIA). Besides the overall estimation of the aquatic systems class, variations in the three lagoons present in the study area were analyzed individually. Measures of agreement between the classification and reference data indicate that the accuracy for the classification ranked from moderate to high (K = 0.76 ± 0.07; = 0.77 ± 0.06). From 1973 to 1997 urban area has doubled, growing to the north and the northeast, extending mainly over natural vegetation and agricultural land. La Escopama and El Sabalo, two of the lagoons studied, reduced their size to less than half that estimated in 1973, but the main estuarine system in the study area, Estero de Urias -El Infiernillo, has maintained its area without noticeable changes. However, the surrounding landscape in Estero de Urias -Infiernillo is changing from natural vegetation and agriculture to urban land use. Consequently, to limit as much as possible changes in the area to natural causes, some management measures must be considered to design urban development plans and to recover and preserve the natural areas, on a broad scale rather than a local spatial scale.
Ocean & Coastal Management, 2003
... Changes in natural cover and land use within the Ceuta coastal lagoon system, Mexico, were as... more ... Changes in natural cover and land use within the Ceuta coastal lagoon system, Mexico, were assessed using multitemporal analysis of Landsat imagery. ...
Ocean & Coastal Management, 2008
We analyze part of the available information on the extent of mangroves and discuss the consisten... more We analyze part of the available information on the extent of mangroves and discuss the consistency of the records, because of the importance of mangrove cover at both a global and local scale and because of the differences among time-series figures and estimated trends, with ...
Estuarine, Coastal and Shelf Science, 1999
Human activities, such as agriculture and shrimp farming, have influenced the Huizache-Caimanero ... more Human activities, such as agriculture and shrimp farming, have influenced the Huizache-Caimanero lagoon system, modifying the landscape and diminishing its natural productivity. Four Landsat MSS (multi-spectral scanner) and TM (thematic mapper) sub-images, taken between 1973 and 1997, were analysed to evaluate trends of changes in the lagoon, saltmarsh, mangrove, agriculture, secondary succession and dry forest classes. The scenes were enhanced by principal components analysis. A thematic map for each sub-image was produced using supervised classification with the extraction and classification of homogeneous objects algorithm (ECHO). Aerial photography and field verification of testing points were used to validate the classification and to assess its accuracy using the Kappa coefficient. The area covered by class and year was estimated and the temporal trends were defined by linear regression. The natural covers (lagoon, mangrove and dry forest) showed a significant reduction in 1997 when compared with 1973, whereas the agricultural areas, secondary succession and saltmarshes showed an increase in cover. The frequency distribution analysis of the normalized difference vegetation index (NDVI) confirmed the observed trends. The Huizache-Caimanero region is a highly disturbed landscape, mainly caused by agricultural practices, that must be rehabilitated to maintain its natural productivity.
Descripción: Landsat satellite imagery from 1973, 1990 and 2000, was classified and a further pos... more Descripción: Landsat satellite imagery from 1973, 1990 and 2000, was classified and a further post classification comparison, including digital ancillary information, was done to analyze the land cover and land uses changes in the coastal region of northern Nayarit. ...
Investigaciones …, 2008
Resumen. Se propone un esquema para la clasificación de los humedales de México basado en el anál... more Resumen. Se propone un esquema para la clasificación de los humedales de México basado en el análisis comparativo de los principales sistemas de clasificación actualmente en uso. El análisis incluyó 18 clasificaciones de diferentes partes del mundo, aunque la discusión se centró en los sistemas de clasificación de los Estados Unidos y de la Convención sobre Humedales de Ramsar, además de una aproximación geomorfológica (formas terrestres) e hidrológica (régimen de agua) con la adición de los humedales artificiales propuestos por la Convención de Ramsar. Cuenta con una estructura jerárquica con tres ámbitos (marino-costeros, continentales y artificiales), cinco sistemas (marino, estuarino, fluvial, lacustre y palustre), ocho subsistemas y 26 clases (17 naturales y nueve artificiales). Desde un enfoque paisajístico las clases corresponden a facetas acuáticas integradas por un conjunto de ecotopos los cuales pueden definirse con base en los criterios y descriptores propuestos en los sistemas estadounidense y geomorfológico.
Investigaciones …, 2008
Resumen. Se propone un esquema para la clasificación de los humedales de México basado en el anál... more Resumen. Se propone un esquema para la clasificación de los humedales de México basado en el análisis comparativo de los principales sistemas de clasificación actualmente en uso. El análisis incluyó 18 clasificaciones de diferentes partes del mundo, aunque la discusión se centró en los sistemas de clasificación de los Estados Unidos y de la Convención sobre Humedales de Ramsar, además de una aproximación geomorfológica (formas terrestres) e hidrológica (régimen de agua) con la adición de los humedales artificiales propuestos por la Convención de Ramsar. Cuenta con una estructura jerárquica con tres ámbitos (marino-costeros, continentales y artificiales), cinco sistemas (marino, estuarino, fluvial, lacustre y palustre), ocho subsistemas y 26 clases (17 naturales y nueve artificiales). Desde un enfoque paisajístico las clases corresponden a facetas acuáticas integradas por un conjunto de ecotopos los cuales pueden definirse con base en los criterios y descriptores propuestos en los sistemas estadounidense y geomorfológico.
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Papers by Cesar Alejandro Berlanga Robles