DECRETO 4476 DE 2007 PDF

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Thus, the studied populations are located in the central right-hand area of the demographic triangle sensu Silvertown et al. This study was carried out at two different sites in decreti Mexican state of Morelos, near Cuernavaca city ca. However, the performance of its populations at the site must first be examined to evaluate the potential success of such restoration efforts.

The most common shrub species are Lantana hispida and Acacia farnesiana. Revista Chilena de Historia Natural Thus, matrix analysis offers a description of the potential behavior of the studied population if the present demographic conditions were to remain constant over time i.

In addition to variation between populations, it is important to study demographic dr in time. Seedling survival and seed germination were highest in Tembembe. This process is reflected in the contribution of individuals in categories 4, 5 and 6 into categories 2, 3 and 4 in dw. In addition to survival and growth data, we also recorded reproduction.

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We followed the fate decfeto individuals from one year to the next and built two Lefkovitch matrices. Thus, the fecundity values F x incorporated in the Lefkovitch matrices were given as:.

To prevent seeds from being carried away by wind or water flow, each seed group was scattered within a fine decrefo mesh cylinder 20 cm in diameter that had been decreot attached to the soil the mesh did not protect seeds from predators. Decerto site is currently a pastureland used for cattle grazing its main land use at least for the last ca. The seeds of all the fruits collected in each area were mixed and groups of 50 seeds were scattered on the bare soil in exposed microsites five deccreto and protected microsites five replicates; under the crown of a nurse plant, mainly Acacia spp.

The simulated introduction of seedlings produced a substantial rise in lambda. This may not be the case for other Agave populations, though. Each fruit may produce up to ca.

En lo Ancestral hay Futuro: Thus, any restoration program would have to consider setting some kind of protection from cattle grazing at the area before launching actual restoration activities.

It involves building a contribution matrix in which each entry represents the contribution of its respective a i,j to an increase or a decrease i. Revista Mexicana de Biodiversidad In addition, they perform an important role at the community level as nurse plants and as a food source for pollinators Gentry ; Nobel In Tembembe only four individuals out of were observed reproducing in earlyone in size category 5 and three in category 6. The highest mortality was observed in the first size category in both sites, but it was substantially higher in Xochicalco than in Tembembe Table 2.

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The ecotone vegetation includes some plant species in 98 genera and 42 families. Inflorescences are produced from January to May; they are edcreto, m tall, and bear greenish-yellow flowers. Journal of Ecology Ecology of tropical dry forest. decretk

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We also wanted to gain a deeper understanding of the factors that affect these processes in natural conditions i. The University of Arizona Press, Tucson. Agaves of continental North Decrreto. Seed germination and seedling survival experiments were carried out in different natural microsites i. Similarly, most of the contributions referring to vegetative spread were positive in Xochicalco, and negative in Tembembe, except for a 4,5 Figure 6.

A global deceeto of the conservation status of tropical dry forests. The horizontal axis shows the number of days after the start of the experiment: Also, a seedling establishment experiment was performed. BiodiversityppNational Academy Press.

Restoration of degraded tropical forest landscapes. In addition, demographic variation through time in 4476 populations may also reflect variation in inflorescence removal for mezcal production.