in dry parts of asia and africa where the rain was sparse and the surface water inadequate, man has had to search for-other sources of water namely ground water. through this need he learned to tap ground water and extract it to the surface. thus qanats were developed in persia.techniques of qanat construction were later introduced by persians to parts of asia and dry lands of africa.constructi...

Hay varias clasificaciones costeras. La mayoría de ellas han sido elaboradas a nivel mundial utilizando criterios tectónicos, climáticos, topográficos u oceanográficos. Otras mayor escala y enfocadas catalogar las formas costeras: acantilados, playas, estuarios, lagunas o complejos dunares.Este trabajo analiza los tipos litoral, entendiendo como tal cada sector que presenta determinadas condici...

Stopover areas are vital for the successful migration of many species of shorebirds, as they, in part, allow individuals to deposit large quantities of fat needed to fuel their northward and southward journeys. While much research has focused on bird migration, few studies closely examine the environmental characteristics of specific stopover areas. For our study, we conducted prey availability...

We define vernal pools as precipitation-filled seasonal wetlands inundated during periods when temperature is sufficient for plant growth, followed by a brief waterlogged-terrestrial stage and culminating in extreme desiccating soil conditions of extended duration. These factors have played a significant selective role in shaping the vernal pool flora and fauna. Inundation during the growing se...