Examinando por Materia "Wetlands"

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    Arthropods associated with Callisthene fasciculata (Vochysiaceae) canopy in the Pantanal of Mato Grosso, Brazil.
    (Universidad del Valle, 2020-07-09) Yamazaki, Lúcia; Vindica, Vanessa França; Isaac Marques, Marinêz; Battirola, Leandro Dênis; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Studies on arthropods associated with tropical rainforest canopies contribute to a further understanding of forest canopy community dynamics and their relationship to the structure and function of this ecosystem. This study evaluated arthropod community composition in monodominant Callisthene fasciculata forest canopy throughout the high water and dry periods in the northern region of the Pantanal in Mato Grosso, Brazil, as a part of a project about arboreal canopy arthropods associated with monodominant areas in this region. Sampling was conducted on 12 individuals of C. fasciculata, six from the high-water season (2010) and six from the dry season (2011), using insecticide fogging. A total of 28,197 arthropods were collected. Hymenoptera (the majority being Formicidae), Diptera, Acari, Thysanoptera, Hemiptera and Coleoptera, were the most representative groups. Although the analysis did not show variation in the abundance of individuals between the high water and dry seasons, the arthropod community varied significantly in taxa composition. Opiliones, Embioptera, Ephemeroptera and Scorpiones occurred only during the high-water period, with Polyxenida and Strepsiptera occurring only in the dry season. Thysanoptera was more abundant in the dry season, showing a relationship with the beginning of the C. fasciculata flowering period. In general, the high water and dry seasons maintain distinct communities in this habitat, illustrating how the temporal variation in the phenology of C. fasciculata imposed by the Pantanal’s hydrological regime alters the composition of the associated arthropod communities in the canopy of these monodominant formations in the Pantanal of Mato Grosso.
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    PublicaciónAcceso abierto
    Dinámicas Espacio-Temporales de la cobertura de la tierra en cuatro humedales en el Departamento del Valle del Cauca : el Tíber, Colindres, Sandrana y el Estero.
    (2015-04-13) Castañeda Zuluaga, Leydy Lorena
    Los humedales son elementos importantes del medio natural que interactúan con la sociedad y sirven a esta de diferentes formas. Proveen muchos servicios que contribuyen al bienestar de la sociedad. Algunas comunidades, particularmente aquellas que viven en cercanías de los humedales, son muy dependientes de estos servicios, ya que les permite hacer uso de estos a través de la producción de alimentos (pesca y caza), purificación del agua y detoxificación de desechos, regulación del clima, mitigación del cambio climático y servicios culturales. Así mismo la población circundante se ve directamente afectada, cuando el uso de estos ecosistemas no es el adecuado. En este artículo, se realiza un análisis de los cambios multitemporales de la cobertura de la tierra en cuatro humedales del Departamento del Valle del Cauca (El Tíber, Colindres, Sandrana y El Estero), este proceso se realizó a través de la evaluación de fotografías aéreas con diferentes periodos de tiempo, y la aplicación de los sistemas de información geográfica -SIG- el cual permitió cuantificar y analizar de una manera más amplia y detallada los cambios que han presentado estos ecosistemas entre ellos: descenso del nivel freático, perdida del bosque natural, aparición de cultivos de caña de azúcar, ganadería, cultivos transitorios, perdida de la cobertura vegetal y finalmente construcción de carreteras. Sin lugar a dudas, este documento se convierte en un insumo importante para la toma de decisiones sobre protección y preservación, acción necesaria si se pretende resguardar los humedales del avance indiscriminado de los agro negocios en el Departamento del Valle del Cauca. Summary. Wetlands are important elements of the natural environment that interact and serve the society in different ways. They provide many services that contribute to the welfare of society. Some communities, particularly those living in the vicinity of wetlands, are highly dependent on these services because they provide a variety of uses such as food production (fishing and hunting), water purification and detoxification of waste, climate regulation, climate change mitigation and cultural services. Also, the surrounding population is directly affected when the use of these ecosystems is inadequate. This article aims to analyze the multitemporal changes of the land cover in four wetlands of the Department of Valle del Cauca (El Tiber, Colindres, Sandrana and El Estero). This process is performed through the evaluation of aerial photographs at different periods of time and the application of Geographical Information Systems - GIS – This methodology allowed to quantify and analyze in a more comprehensive and detailed manner the changes these ecosystems have gone through. Undoubtedly, this document becomes an important input for decisions on protection and preservation, an action required to protect the wetlands of the indiscriminate advance of agricultural business in the Department of Valle del Cauca.