River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales
"Freshwater ecosystem degradation in the Amazon and Orinoco river basins is increasing due to rising human population numbers, and large water development projects. Therefore, monitoring ecosystem condition in these rivers of high biodiversity is of global conservation importance. This disserta...
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2012
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Acceso en línea: | http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/23 |
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ir-p17054coll23-232020-09-28 River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales Gómez Salazar, Catalina "Freshwater ecosystem degradation in the Amazon and Orinoco river basins is increasing due to rising human population numbers, and large water development projects. Therefore, monitoring ecosystem condition in these rivers of high biodiversity is of global conservation importance. This dissertation evaluated the potential of using river dolphins as indicators of ecosystem condition in large tropical rivers of South America. First, population estimates of river dolphins were obtained by line-strip transect surveys and mark-recapture methods on photo-identifications. Using this information, I identified critical habitat, hotspots, and areas of concern for river dolphins, as well as the relationship between dolphin density and group size estimates with ecological features. Second, I evaluated the relationship between dolphin estimates and human stressors. Higher densities of dolphins occurred in rivers with low indices of overall freshwater degradation, such as rivers with high water quality and the lowest human population numbers. Thus, dolphin density estimates seem to be good indicators of freshwater ecosystem degradation in the Amazon and Orinoco basins. These top predators not only are indicator species, but also have the potential to act as flagship and sentinel species, indicating freshwater ecosystem degradation and stimulating conservation action. This dissertation highlights the large changes in the Amazon and Orinoco that are approaching fast. Indicator, flagship and sentinel species can become science-based conservation tools not to only document freshwater ecosystem degradation, but to raise awareness about broader implications of human stressors on biodiversity and river systems." Amazon; Freshwater ecosystem degradation; Human stressors; Indicators; Orinoco; River dolphins; Top predators Ciencias naturales y matemáticas; Ciencias naturales y matemáticas / Ciencias de la vida Biología 2012 PDF Tesis ENG - Inglés Amazonas (Región) Colfuturo © Derechos reservados del autor http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/23 |
institution |
Biblioteca Virtual Banco de la República - Colecciones digitales |
collection |
Custom |
language |
Desconocido (Unknown) |
topic |
Amazon; Freshwater ecosystem degradation; Human stressors; Indicators; Orinoco; River dolphins; Top predators Ciencias naturales y matemáticas; Ciencias naturales y matemáticas / Ciencias de la vida Biología |
spellingShingle |
Amazon; Freshwater ecosystem degradation; Human stressors; Indicators; Orinoco; River dolphins; Top predators Ciencias naturales y matemáticas; Ciencias naturales y matemáticas / Ciencias de la vida Biología Gómez Salazar, Catalina River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
description |
"Freshwater ecosystem degradation in the Amazon and Orinoco river basins is increasing due to rising human population numbers, and large water development projects. Therefore, monitoring ecosystem condition in these rivers of high biodiversity is of global conservation importance. This dissertation evaluated the potential of using river dolphins as indicators of ecosystem condition in large tropical rivers of South America. First, population estimates of river dolphins were obtained by line-strip transect surveys and mark-recapture methods on photo-identifications. Using this information, I identified critical habitat, hotspots, and areas of concern for river dolphins, as well as the relationship between dolphin density and group size estimates with ecological features. Second, I evaluated the relationship between dolphin estimates and human stressors.
Higher densities of dolphins occurred in rivers with low indices of overall freshwater degradation, such as rivers with high water quality and the lowest human population numbers. Thus, dolphin density estimates seem to be good indicators of freshwater ecosystem degradation in the Amazon and Orinoco basins. These top predators not only are indicator species, but also have the potential to act as flagship and sentinel species, indicating freshwater ecosystem degradation and stimulating conservation action. This dissertation highlights the large changes in the Amazon and Orinoco that are approaching fast. Indicator, flagship and sentinel species can become science-based conservation tools not to only document freshwater ecosystem degradation, but to raise awareness about broader implications of human stressors on biodiversity and river systems." |
format |
Trabajo de grado (Bachelor Thesis) |
author |
Gómez Salazar, Catalina |
author_facet |
Gómez Salazar, Catalina |
author_sort |
Gómez Salazar, Catalina |
title |
River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
title_short |
River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
title_full |
River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
title_fullStr |
River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
title_full_unstemmed |
River dolphins as indicators of ecosystem degradation in large tropical rivers = Delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
title_sort |
river dolphins as indicators of ecosystem degradation in large tropical rivers = delfines de río como indicadores de la degradación de los ecosistemas en ríos tropicales |
publishDate |
2012 |
url |
http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/23 |
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1682459861151907840 |
score |
12,131701 |