Vegetation on geomorphic surfaces in the Monserrat Island in the Gulf of California
DOI:
https://doi.org/10.19136/era.a7n2.2334Palabras clave:
Baja California, endemic plants, geomorphic areas, island biogeography, sarcocaule xerophilous scrub.Resumen
Knowledge about vegetation patterns along topographic gradients is crucial for conservation and management of arid islands. The objective of this study was to identify environmental, soil, and topography variables affecting plant distribution in Monserrat Island. A floristic and environmental survey was undertaken on this island (25° 41’ 00” N, 111° 03’ 00” W; 19.9 km2) in the Gulf of California, Mexico. Seven geoform zones were distinguished. The vegetation is predominantly a sarcocaule xerophilous scrub which develops mainly in ravines and bottoms of streams. One hundred fourteen species were recorded, of which 33 plants (28.9%) are endemic belonging to 92 genera and 38 families of vascular plants. The most abundant families were: Asteraceae, Euphorbiaceae, Fabaceae, Poaceae, and Cactaceae. The Bursera trees are more abundant in areas with little steep slopes (less than 25◦ ). On areas with steep slopes (greater than 45°), the development of vegetation is scarce. Northern exposure slopes had denser vegetation, with higher canopy cover values. Slope was far more reliably measure for describing vegetation distribution than altitude, although, the latter variable influences Olneya tesota. Euphorbia magdalenae was strongly associated with slope, and both Jouvea pilosa and Marina parryi was influenced by soil characteristics. Jatropha cuneata was found in almost all geoforms. It was concluded that Monserrat Island possesses a distinctive mix of xeric species making this island unique due to the high presence of endemic plants.Descargas
Biografía del autor/a
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Victor Ortiz-Ávila, Universidad Autónoma Agraria Antonio Narro
Maestro-Investigador
Departamento de Nutrición Animal
Universidad Autónoma Agraria Antonio Narro
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Gustavo A. Arnaud-Franco, Northwest Biological Research Center, La Paz, Mexico
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Eduardo Estrada-Castillón, Autonomous University of Nuevo Leon, Forestry Department, Linares, Mexico
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Eloy A. Cavazos-Lozano, Autonomous Agrarian University Antonio Narro, Department of Renewable Natural Resources, Saltillo, Mexico
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Guillermo Romero, Universidad Autonomous Univesity of Baja California, Faculty of Sciences, Ensenada, Mexico
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Miguel Mellado, Autonomous Agrarian University Antonio Narro, Department of Animal Nutrition, Saltillo, Mexico.
Autonomous Agrarian University Antonio Narro, Department of Animal Nutrition, Saltillo, Mexico.
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