Riqueza de fauna ribereña del río Luján

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Riparian environments are usually characterized by high biological diversity, however, habitat degradation results from intensive use of the bank and the water course, and exploitation of the surrounding land. The Luján River basin, located in East-central Argentina, shows two distinct geomorphologi...

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Autores principales: Guichón, M. Laura, Cassini, Marcelo H.
Lenguaje:Inglés
Publicado: 2007
Materias:
LANDSCAPE SCALE
PAMPAS REGION
RIPARIAN MAMMALS
WATERFOWL
AVES ACUATICAS
ESCALA DE PAISAJE
MAMIFEROS RIBEREÑOS
REGION PAMPEANA
Acceso en línea:https://hdl.handle.net/20.500.12110/ecologiaaustral_v017_n01_p081
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:ecologiaaustral_v017_n01_p081
record_format dspace
spelling todo:ecologiaaustral_v017_n01_p0812023-10-03T13:34:39Z Riqueza de fauna ribereña del río Luján Riparian wildlife richness along the Luján River Guichón, M. Laura Cassini, Marcelo H. LANDSCAPE SCALE PAMPAS REGION RIPARIAN MAMMALS WATERFOWL AVES ACUATICAS ESCALA DE PAISAJE MAMIFEROS RIBEREÑOS REGION PAMPEANA Riparian environments are usually characterized by high biological diversity, however, habitat degradation results from intensive use of the bank and the water course, and exploitation of the surrounding land. The Luján River basin, located in East-central Argentina, shows two distinct geomorphologic portions: the Pampean and the Deltaic portions, which in turn can be subdivided based on physiographic and land use features. Our objective was to compare riparian wildlife richness among the three zones of the Pampean portion (upper, middle, and lower), and between the two zones of the Deltaic portion (protected and antropic). From March to October 1997, 82 transects were randomly placed along the banks of the Luján River. We surveyed the presence of coypus, capybara, and Neotropical river otter based on signs of activity, and the presence of water birds (non Passeriformes) based on direct observation. In the Pampean portion, the number of species per transect in the middle zone was significantly lower than in the upper and lower zones. The middle zone is characterized by a narrow alluvial plain associated with more intense use of the land and less availability of water and hydrophilic vegetation in the surrounding habitats than the other two zones. In the Deltaic portion, the protected zone showed a larger species richness than the antropic zone, where intense use of the river and modification of its bank can negatively affect wildlife. Las características de paisaje modelan los hábitats disponibles para la fauna y condicionan el uso de la tierra. Los ambientes ribereños, que se caracterizan por tener una alta diversidad biológica, han sufrido, en su mayoría, altos niveles de deterioro debido al uso intensivo del río y sus costas, y a la explotación de las tierras aledañas. La cuenca del río Luján, ubicada en el centro-este de Argentina, presenta dos porciones geomorfológicas diferentes: la porción Pampeana y la Deltaica, que a su vez pueden subdividirse sobre la base de diferencias fisiográficas y de uso de la tierra. El objetivo de nuestro trabajo fue comparar la riqueza de especies de fauna ribereña entre las tres zonas de la porción Pampeana (superior, media e inferior), y las dos zonas de la porción Deltaica (protegida y antrópica). Entre marzo-octubre de 1997, se realizó un muestreo en 82 transectas de 600 m de largo ubicadas aleatoriamente sobre las costas del río Luján (166 km de largo). La presencia de coipo, carpincho y lobito de río fue relevada mediante un método indirecto usando signos de actividad, y la presencia de aves acuáticas (no Passeriformes) mediante avistajes. En la porción Pampeana del río, la riqueza de especies por transecta en la zona media resultó significativamente menor que en las zonas inferior y superior. La zona media se caracteriza por tener un valle aluvial angosto que está asociado a una mayor perturbación humana y probablemente a una menor disponibilidad de agua y vegetación hidrófila en las tierras aledañas que las otras dos zonas. En la porción Deltaica, la zona protegida mostró mayor riqueza que la zona antrópica. El intenso uso del río y de sus costas (v.g. navegación comercial y recreativa, edificación en márgenes del río) en la zona antrópica sería una posible causa del escaso número de especies observadas. 2007-06 PDF Inglés info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar https://hdl.handle.net/20.500.12110/ecologiaaustral_v017_n01_p081
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv Inglés
topic LANDSCAPE SCALE
PAMPAS REGION
RIPARIAN MAMMALS
WATERFOWL
AVES ACUATICAS
ESCALA DE PAISAJE
MAMIFEROS RIBEREÑOS
REGION PAMPEANA
spellingShingle LANDSCAPE SCALE
PAMPAS REGION
RIPARIAN MAMMALS
WATERFOWL
AVES ACUATICAS
ESCALA DE PAISAJE
MAMIFEROS RIBEREÑOS
REGION PAMPEANA
Guichón, M. Laura
Cassini, Marcelo H.
Riqueza de fauna ribereña del río Luján
topic_facet LANDSCAPE SCALE
PAMPAS REGION
RIPARIAN MAMMALS
WATERFOWL
AVES ACUATICAS
ESCALA DE PAISAJE
MAMIFEROS RIBEREÑOS
REGION PAMPEANA
description Riparian environments are usually characterized by high biological diversity, however, habitat degradation results from intensive use of the bank and the water course, and exploitation of the surrounding land. The Luján River basin, located in East-central Argentina, shows two distinct geomorphologic portions: the Pampean and the Deltaic portions, which in turn can be subdivided based on physiographic and land use features. Our objective was to compare riparian wildlife richness among the three zones of the Pampean portion (upper, middle, and lower), and between the two zones of the Deltaic portion (protected and antropic). From March to October 1997, 82 transects were randomly placed along the banks of the Luján River. We surveyed the presence of coypus, capybara, and Neotropical river otter based on signs of activity, and the presence of water birds (non Passeriformes) based on direct observation. In the Pampean portion, the number of species per transect in the middle zone was significantly lower than in the upper and lower zones. The middle zone is characterized by a narrow alluvial plain associated with more intense use of the land and less availability of water and hydrophilic vegetation in the surrounding habitats than the other two zones. In the Deltaic portion, the protected zone showed a larger species richness than the antropic zone, where intense use of the river and modification of its bank can negatively affect wildlife.
author Guichón, M. Laura
Cassini, Marcelo H.
author_facet Guichón, M. Laura
Cassini, Marcelo H.
author_sort Guichón, M. Laura
title Riqueza de fauna ribereña del río Luján
title_short Riqueza de fauna ribereña del río Luján
title_full Riqueza de fauna ribereña del río Luján
title_fullStr Riqueza de fauna ribereña del río Luján
title_full_unstemmed Riqueza de fauna ribereña del río Luján
title_sort riqueza de fauna ribereña del río luján
publishDate 2007
url https://hdl.handle.net/20.500.12110/ecologiaaustral_v017_n01_p081
work_keys_str_mv AT guichonmlaura riquezadefaunariberenadelriolujan
AT cassinimarceloh riquezadefaunariberenadelriolujan
AT guichonmlaura riparianwildliferichnessalongthelujanriver
AT cassinimarceloh riparianwildliferichnessalongthelujanriver
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