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Browsing by Author "Cuervo Ferrin, Cindy Marcela"

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    Determinación de áreas de afectación por presencia humana, en los sitios de importancia para las aves playeras en el Delta del Rio Iscuandé y PNN Sanquianga del departamento de Nariño - Colombia.
    (Universidad Santiago de Cali, 2024-04-26) Cuervo Ferrin, Cindy Marcela; Escalante Caicedo, Ana Bely
    The Pacific coast of Nariño, Colombia, is a region with a high biodiversity potential, in which two important areas have been identified for the conservation of shorebirds. Highlighting the Bocana del Río Iscuandé as the first site of regional importance for the Hemispheric Network, has an area of 12712 ha in the information extracted by the ArcGis and is used by more than 50,000 shorebirds a year, hosting to date 22 different species, including the plover piquigrueso (Charadrius wilsonia) and the western sandpiper (Calidris mauri). Sanquianga National Natural Park covers approximately 53% of the mangroves in the department of Nariño and 20% of the mangroves in the Colombian Pacific, making it a highly productive and biodiverse ecosystem. This park covers an area of 80,000 hectares and is a site of international importance for WHSRN (Western Hemisphere Shorebird Reserve Network). In addition to this, it should be noted that within each of these areas, there are specific feeding and resting sites for shorebirds, which were taken into account for these analyses. Human disturbance of natural areas causes, to a large extent, the loss of habitat and the birds' stay in the area. On the other hand, airstrips allow us to evaluate the accessibility of the sites for tourists, since they offer a direct and convenient way to access remote and difficult to reach areas. In addition, the beaches variable allows us to identify how accessible the beaches are for the people who live in the area. To understand the magnitude of the effect of human disturbance on shorebird concentration sites, a geographic perspective was used to analyze the level of disturbance to the sites. Two components of disturbance were selected: connectivity (airstrips) and tourism supply (beaches and population centers). Once these components were defined, spatial analyses were carried out to evaluate the proximity of the variables as a measure of influence. Finally, the areas affected by the sites in relation to each variable were determined. The spatial analyses consisted of using areas of influence of different radii to evaluate the proximity of the variables to the sites, defining proximity as the largest radius of incidence. This was carried out using ArcGIS Pro software and the Buffer and Selection by Location tools. This analysis provides valuable information for future decision making in terms of conservation of natural areas. Ultimately, this article shows the usefulness of GIS as an effective decision-making tool.

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