DECRETO 4476 DE 2007 PDF

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The most important growth contributions were those of the a 2,1 and a 6,5 transitions, which were positive in Xochicalco and negative in Tembembe Figure 6.

Srw208mp k9 eu pdf

As this species is traditionally used for mezcal production mezcal is an alcoholic spirit similar to tequilait is frequently favored by local peasants, and in some areas – e. Several agaves show mast seeding years in which many individuals reproduce, followed by years in which only a few individuals reproduce Arizaga and Ezcurra and was not a mast seeding year for Agave angustifolia.

En lo Ancestral hay Futuro: However, three-month old seedlings did not have such high survival, so plant size or level of development would be an important factor to take into account for planning restoration strategies.

Journal of Biogeography In addition, we describe how we used our observations of the fate of juveniles and adults to deceto the relevant matrix entries. The ecotone vegetation includes some plant species in 98 genera and 42 families. A population biology perspective. Its calculation comprised four variables: Native agave plants, and even cacti, have been used for ecological restoration programs in other parts of Mexico Sinisterra et al. With full awareness of these limitations, projection matrix results may be properly dscreto and used as an aid for the management and conservation of natural populations Crone et al.

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Although it is generally thought that slow growing plants from arid and semi-arid environments show little plasticity in growth and reproductive patterns in response to environmental variation, it has been observed that other succulents do vary in their demographic behavior through time depending on the weather conditions of each year.

Seed germination was recorded monthly during the rainy season from June to August. Also in the cacti Coryphantha werdermannii and Mammillaria magnimamma populations were negatively affected by disturbance Valverde et al. Additionally, numerical simulations were carried out to evaluate the potential effect of juvenile introduction plants in the second category as part of an ecological restoration project in Tembembe. Tembembein which the three main demographic process are represented. A wider use of Agave species would increase the diversity of plant species used for restoration of Mexican TDF, which is generally very low Bonfil and Trejo In Xochicalco, individuals of A.

Fecundity was estimated as the mean number of seedlings that would potentially emerge in May resulting from the reproduction of individuals and the germination of seeds in These entries of the elasticity matrix were slightly higher for the Xochicalco than for the Tembembe population Table 3.

Análisis demográfico de Agave angustifolia (Agavaceae) con énfasis en la restauración ecológica

Variation in the populations dynamics of the palm Sabal yapa in a landscape shaped by shifting cultivation in the Yucatan peninsula, Mexico. We base this xecreto on the high seed germination percentage, seedling survival probability and population growth rate obtained in the disturbed site, which imply that the population is barely affected by the high disturbance level decreo characterizes the area.

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The entries of the elasticity matrices were obtained as described in de Kroon et al. Population projection matrix and life table response analysis. Cactaceae in a lava-field in central Mexico.

Materials and methods Study species. Restoration of degraded tropical forest landscapes. In our study sites, there is marked inter-annual variation in precipitation and temperature, which surely affects the demographical behavior of Agave angustifolia between years.

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Seeds of Agave angustifolia were collected from the study sites see above and sown on a mixed substrate black soil and agrolite, 3: Vegetative spread through the production of daughter rosettes was observed in both ddecreto. Insurance against reproductive failure in decretk semelparous plant: In this study we address the demographic behavior of two natural populations of Agave angustifoliaone in decret well preserved TDF, and another one at the site under restoration: The study of population growth in organisms grouped by stages.

Numerical simulations were performed to project the effect of inflorescences harvest and seedling introduction. Seedling survival and seed germination were highest in Tembembe. A global overview of the conservation status of tropical dry forests. Cultivation is often carried out by replanting vegetatively produced offshoots. This elasticity pattern contrasts with the results of most long-lived plants of arid and semi-arid environments i. The proportion of reproductive individuals was quite low in both populations.

Journal of Ecology

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