Geomorphological characteristics of mountain watershed rivers colonized by Castor canadensis in Tierra del Fuego, Argentina
Keywords:
watershed, geomorphology, Tierra del FuegoAbstract
The geomorphology of a Fuegian Andes watershed colonized by the introduced species Castor canadensis has been analyzed. The main objective was to distinguish the physical conditions of the occupied streams. Geomorphological analysis and mapping techniques were applied; also, colonization monitoring surveys in the entire watershed was made through terrestrial and aerophotogrametrical methods. Were made aerial surveys during the autumn. Streams of first and second order and low gradient (0-6o) were those chosen by Castor canadensis for settlement. The higher-order streams were seasonally occupied, but restricted only to their secondary landforms. The northern part of the watershed is larger in size, drainage density and stream numbers; therefore, it offers more settlement possibilities. The rivers of the lateral hanging valleys were more densely occupied than those of the slope units. Several of the conditions of rivers for Castor canadensis settlement observed in Tierra del Fuego were similar to those observed in the Northern Hemisphere.
References
CORONATO, A & C ROIG. 1997. Caracterización geomorfológica de los valles Tierra Mayor y Río Olivia. Pp. 13-20 en: R Sarandón (ed). Evaluación ambiental regional de la normativa de usos para los valles Tierra Mayor y Río Olivia. Análisis de los aspectos de fragilidad ecológica. Consejo Federal de Inversiones, Secretaría de Planeamiento de la Provincia de Tierra del Fuego.
GOTIE, R & D JENKS. 1984. Assessment of the use of wetlands inventory maps for determining potential beaver habitat. New York Fish Game J. 31:54-62.
HORTON, R. 1945. Erosional development of streams and their drainage basins: hydro-physical approach to quantitative geomorphology. Geol. Soc. Am. Bull. 56:275-370.
ITURRASPE, R; M GAVIÑO NOVILLO & A URCIUOLO. 1998. Caracterización hidrológica de los valles de Tierra Mayor y Carbajal, Tierra del Fuego. Pp. 147-156 en: Anales XVII Congreso Nacional del Agua y II Simposio del Cono Sur. Santa Fe.
ITURRASPE, R; R SOTTINI; C SCHROEDER & J ESCOBAR. 1989. Hidrología y variables climáticas del Territorio de Tierra del Fuego. Información Básica. Contribución Científica N°7, CADIC-CONICET. Ushuaia.
ITURRASPE, R & A URCIUOLO. 1998. Análisis cuantitativo de los efectos de la temperatura sobre la variabilidad del escurrimiento en la época invernal en cursos de la Cordillera Fueguina. Pp. 137-146 en: Anales XVII Congreso Nacional del Agua y II Simposio del Cono Sur. Vol. 1. Santa Fe.
JOHNSTON, C & R NAIMAN. 1987. Boundary dynamics at the aquatic-terrestrial interface: the influence of beaver and geomorphology. Landscape Ecol. 1:47-57.
KÖPPEN, W. 1936. Das geographische system der klimate. Pp. 1-44 en: W Köppen & Geiger (eds). Hansbuch der klimatologie. Verlag von gebruder Borntraeger. Berlín.
LIZARRALDE, M. 1993. Current status of the introduced beaver (Castor canadensis) population in Tierra del Fuego, Argentina. Ambio 22:351-358.
LIZARRALDE MS; GA DEFERRARI; SE ALVAREZ & JM ESCOBAR. 1996. Effects of beaver (Castor canadensis) on the nutrient dynamics of the Southern Beech forest of Tierra del Fuego (Argentina). Ecología Austral 6:101-105.
LIZARRALDE, M & J ESCOBAR. 2000. Mamíferos exóticos en la Tierra del Fuego. Ciencia Hoy 10:52-63.
MOORE, DM. 1983. Flora of the Tierra del Fuego. Anthony Nelson. Shropshire.
NAIMAN, R; H DESCAMPS; J PASTOR & C JOHNSTON. 1988. The potential importance of boundaries to fluvial ecosystems. J. N. Am. Benthol. Soc. 7:289-306.
NAIMAN, R & J SEDELL. 1981. Stream ecosystem research in a watershed perspective. Ver. Int. Verein. Limnol. 21:804-811.
OLIVERO, E & D MARTINIONI. 1996. Sedimentología de las formaciones Lemaire y Yahgan (Jurásico-Cretácico) en Tierra del Fuego. Pp. 45-49 en: Actas XIII Congreso Geológico. Vol. 2. Buenos Aires.
OLIVERO, E; D MARTINIONI; N MALUMIÁN & S PALAMARCZUCK. 1999. Bosquejo geológico de la Isla Grande de Tierra del Fuego. Pp. 291-294 en: Actas XIV Congreso Geológico Argentino. Vol. 1. Salta.
PISANO, E. 1977. Fitogeografía de Fuego- Patagonia Chilena y comunidades vegetales entre las latitudes 52° y 56° S. Anales del Instituto de la Patagonia 8:121-250.
STRAHLER, A. 1964. Quantitative geomorphology of drainage basins and channel networks. Pp. 4-76 en: V Chow (ed). Handbook of applied hydrology. McGraw-Hill. Nueva York.
SUZUKI, N & W MCCOMB. 1998. Habitat classification models for Beaver (Castor canadensis) in the streams of the central Oregon coast range. Northwest Sci. 72:102- 110.
Downloads
Published
How to Cite
Issue
Section
License
Authors retain their rights as follows: 1) by granting the journal the right to its first publication, and 2) by registering the published article with a Creative Commons Attribution License (CC-BY 4.0), which allows authors and third parties to view and use it as long as they clearly mention its origin (citation or reference, including authorship and first publication in this journal). Authors can make other non-exclusive distribution agreements as long as they clearly indicate their origin and are encouraged to widely share and disseminate the published version of their work.
