Fishes from the upper Yuruá river, Amazon basin, Peru

We report results of an ichthyological survey of the upper Rio Yuruá in southeastern Peru. Collections were made at low water (July-August, 2008) near the headwaters of the Brazilian Rio Juruá. This is the first of four expeditions to the Fitzcarrald Arch — an upland associated with the Miocene-Pliocene rise of the Peruvian Andes — with the goal of comparing the ichthyofauna across the headwaters of the largest tributary basins in the western Amazon (Ucayali, Juruá, Purús and Madeira). We recorded a total of 117 species in 28 families and 10 orders, with all species accompanied by tissue samples preserved in 100% ethanol for subsequent DNA analysis, and high-resolution digital images of voucher specimens with live color to facilitate accurate identification. From interviews with local fishers and comparisons with other ichthyological surveys of the region we estimate the actual diversity of fishes in the upper Juruá to exceed 200 species

Variación del área agrícola en el distrito La Yarada Los Palos, Tacna, Perú

El crecimiento poblacional y el mayor uso de agua subterránea han favorecido la extensión del área agrícola en los últimos veintiún años en el distrito de La Yarada Los Palos. En el presente estudio, se busca analizar los cambios de la extensión agrícola e identificar tendencias a través la teledetección y análisis espacial multitemporal. Se utilizaron imágenes satelitales Landsat 5 TM y Landsat 8 OLI para el periodo 2000-2020 con el fin de identificar usos agrícolas en el área de estudio. Los resultados muestran que la superficie agrícola aumentó en un 265.84 %, cifra que se duplicaría en los próximos diez años, según la regresión polinómica. Estos hallazgos brindan una base para la toma de decisiones y gestión de futuros proyectos hídricos, agrícolas y sociales

Agricultural areas variation whithin the Yarada de los Palos District, Tacna, Perú

Population growth and the increasing use of groundwater has favored the extension of the agricultural area in the last twenty-one years in the district of La Yarada Los Palos. In this study, we seek to analyze the changes in agricultural extension and identify trends through remote sensing and multitemporal spatial analysis. Landsat 5TM and Landsat 8 OLI satellite images were used for the period 2000-2020 to identify agricultural uses in the study area. The results show that the agricultural area increased by 265.84%, a figure that would double in the next ten years, according to the polynomial regression. These findings provide a basis for decision-making and management of future water, agricultural and social projects.El crecimiento poblacional y el mayor uso de agua subterránea han favorecido la extensión del área agrícola en los últimos veintiún años en el distrito de La Yarada Los Palos. En el presente estudio, se busca analizar los cambios de la extensión agrícola e identificar tendencias a través la teledetección y análisis espacial multitemporal. Se utilizaron imágenes satelitales Landsat 5 TM y Landsat 8 OLI para el periodo 2000-2020 con el fin de identificar usos agrícolas en el área de estudio. Los resultados muestran que la superficie agrícola aumentó en un 265.84 %, cifra que se duplicaría en los próximos diez años, según la regresión polinómica. Estos hallazgos brindan una base para la toma de decisiones y gestión de futuros proyectos hídricos, agrícolas y sociales

Fishes from the upper Yuruá river, Amazon basin, Peru

We report results of an ichthyological survey of the upper Rio Yuruá in southeastern Peru. Collections were made at low water (July-August, 2008) near the headwaters of the Brazilian Rio Juruá. This is the first of four expeditions to the Fitzcarrald Arch — an upland associated with the Miocene-Pliocene rise of the Peruvian Andes — with the goal of comparing the ichthyofauna across the headwaters of the largest tributary basins in the western Amazon (Ucayali, Juruá, Purús and Madeira). We recorded a total of 117 species in 28 families and 10 orders, with all species accompanied by tissue samples preserved in 100% ethanol for subsequent DNA analysis, and high-resolution digital images of voucher specimens with live color to facilitate accurate identification. From interviews with local fishers and comparisons with other ichthyological surveys of the region we estimate the actual diversity of fishes in the upper Juruá to exceed 200 species

Fishes from the upper Yuruá river, Amazon basin, Peru

We report results of an ichthyological survey of the upper Rio Yuruá in southeastern Peru. Collections were made at low water (July-August, 2008) near the headwaters of the Brazilian Rio Juruá. This is the first of four expeditions to the Fitzcarrald Arch — an upland associated with the Miocene-Pliocene rise of the Peruvian Andes — with the goal of comparing the ichthyofauna across the headwaters of the largest tributary basins in the western Amazon (Ucayali, Juruá, Purús and Madeira). We recorded a total of 117 species in 28 families and 10 orders, with all species accompanied by tissue samples preserved in 100% ethanol for subsequent DNA analysis, and high-resolution digital images of voucher specimens with live color to facilitate accurate identification. From interviews with local fishers and comparisons with other ichthyological surveys of the region we estimate the actual diversity of fishes in the upper Juruá to exceed 200 species

Aquatic Biodiversity in the Amazon: Habitat Specialization and Geographic Isolation Promote Species Richness

The Neotropical freshwater ichthyofauna has among the highest species richness and density of any vertebrate fauna on Earth, with more than 5,600 species compressed into less than 12% of the world’s land surface area, and less than 0.002% of the world’s total liquid water supply. How have so many species come to co-exist in such a small amount of total habitat space? Here we report results of an aquatic faunal survey of the Fitzcarrald region in southeastern Peru, an area of low-elevation upland (200–500 m above sea level) rainforest in the Western Amazon, that straddles the headwaters of four large Amazonian tributaries; the Juruá (Yurúa), Ucayali, Purús, and Madre de Dios rivers. All measures of fish species diversity in this region are high; there is high alpha diversity with many species coexisting in the same locality, high beta diversity with high turnover between habitats, and high gamma diversity with high turnover between adjacent tributary basins. Current data show little species endemism, and no known examples of sympatric sister species, within the Fitzcarrald region, suggesting a lack of localized or recent adaptive divergences. These results support the hypothesis that the fish species of the Fitzcarrald region are relatively ancient, predating the Late Miocene-Pliocene (c. 4 Ma) uplift that isolated its several headwater basins. The results also suggest that habitat specialization (phylogenetic niche conservatism) and geographic isolation (dispersal limitation) have contributed to the maintenance of high species richness in this region of the Amazon Basin