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El clima de la selva baja caducifolia en México

ABSTRACT In this paper it is analyzed the main climatic characteristics of mexican seasonally dry tropical forest. In order to know the corresponding climatic environment for this type of vegetation, elements such as precipitation, temperature, days with appreciable rain, dry months and climate type, are evaluated with data from 390 climatological stations. Although the most suitable climate for this forest is the subhumid warm (Awo); it shows a wide distribution including dry and humide climates, due to the combined effect of environmental factors. The environmental variation of most dry forest locatlonship has a strong influence on their phlslonomic and structural characteristics.

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    • "Conforme a Trejo y Dirzo (2002), las comunidades pertenecientes a la selva baja caducifolia se ubican de manera amplia en México, en altitudes de 60 a 2,020 m, con temperatura media de 19 a 27.4°C y precipitación anual de 482 a 1,370 mm. Debido a la marcada estacionali dad de su precipitación (Trejo, 1999), la fenología de la mayoría de sus especies arbóreas se define por la caída total de hojas en la temporada de sequía (Bullock y Solis-Magallanes, 1990). Sin embargo, en sitios donde la vegetación recibe mayor humedad y el tiempo de insolación es menor (arroyos permanentes y cañadas protegidas del viento), la fenología se modifica y pueden encontrarse selvas medianas subcaducifolias o subperennifolias (Miranda y Hernández, 1963; Lott et al., 1987; Durán et al., 2002). "
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    • "An interest in conservation and resource managing systems that communities develop through traditional una franja casi continua en la vertiente del Pacífico, con algunas interrupciones en las porciones más húmedas de Nayarit y Oaxaca. En la vertiente del golfo de México, se distribuye desde Tamaulipas hasta la península de Yucatán (Trejo, 1999). "
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    ABSTRACT: Biodiversity management and use sustain multifunctional agro-ecosystem services, such as: food supply, fodder, firewood, timber, fuel, fiber, and aquifer recharge, among others. The loss of biodiversity and increased risks of its deterioration, frequently inherent to several human activities, raise the need to develop institutional and social capacities for their restoration and conservation. The objective of this work was to identify and describe the diversity of trees and bushes, their uses and types of agroforestry systems. It is important to know the multiplicity of uses, as a synthetic expression of functional logic that makes agroforestry land systems viable. The study's descriptive methodology was based on participatory workshops designed to know the diversity of resources and uses. The subsequent steps involved: selection of families, transects, interviews, records, and collecting and classifying specimens. In total, 81 species and 34 families were identified. Diversity is amplified by the multifunctionality of uses for 55.6 % of the species: 7.4 % with 5 types of uses; 11.1 %, with 4 types; 14.8 % with 3 types; and 22.2 %, 2 types. Types of uses: firewood, 41 species; medicinal 30 species, tool-making 29, timber, 25; feed purpose, 23; forage species, 20, and 6, hedgerows. Some 91.7 % of households use agrosilvicultural systems and 41.7 % silvopastoral ones, according to various socio-economic purposes and use combinations.
    Revista Chapingo, Serie Ciencias Forestales y del Ambiente 04/2012; 18(1):71-86. DOI:10.5154/r.rchscfa.2010.11.124 · 0.22 Impact Factor
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    ABSTRACT: The effect of seed ingestion by two species of iguana (Iguana iguana and Ctenosaura pectinata) on germination and on seed damage by insects was investigated in a Mexican tropical dry forest. We fed individuals of I. iguana with fruits from 11 plant species. Thereafter, we collected the feces, and seeds were removed and sowed. To assess whether seed damage by insects is affected by iguana ingestion, we removed and sowed the seeds of the legume tree Prosopis juliflora contained in feces of C. pectinata. Individuals of I. iguana consumed four of 11 plant species (Cordia alba, Momordica charantia, Pithecellobium dulce, and Lycopersicon esculentum). Overall, germination rate was significantly higher for ingested seeds than for control seeds, except for M. charantia, where no seed germinated. The proportion of R juliflora seeds with bruchid damage was significantly lower for seeds ingested by C. pectinata (33%) than for control seeds (95%). The results suggest that Green Iguanas (I. iguana) are selective in their diets and that seed ingestion by both species of iguanas affected seed survival, germination rate, and dispersal but that their effects are species dependent. Iguanas might play a significant role in the reproductive strategies of some tropical plants.
    Journal of Herpetology 04/2003; 37(2):301-308. DOI:10.1670/0022-1511(2003)037[0301:GASDIT]2.0.CO;2 · 0.84 Impact Factor
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