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The stable size structure vector w and the size-specific reproductive values vector v are reported.
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The resulting seedlings were temporarily transplanted to small pots and then taken to the field. The other dots are different agave and cacti populations two populations of Agave marmorata ; two populations of Mammillaria crucigera ; M. We also recorded offshoot production emergence of daughter rosettesas well as reproduction, and integrated them in the matrices.
The contribution matrices for each site were calculated as follows Pulido et al. The proportion of reproductive individuals was quite low in both populations.
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. Therefore, restoration programs seem the appropriate option for these situations. When adding up the elasticity values corresponding to the same demographic processes, we observed a similar pattern in both sites: Journal of Arid Environments The reproductive value of category 6 represented almost half the total reproductive value, which was expected given the semelparity of individual rosettes, and was higher in Tembembe than in Xochicalco.
These were the variations in the fecundity entries as discussed belowwhich were in turn determined by a higher seed germination and seedling establishment probability in Tembembe compared to Xochicalco, probably due to the higher altitude and thus lower temperatures that prevail at Tembembe.
Plant propagation and the ecological restoration of Tropical Deciduous Forests.
Análisis demográfico de Agave angustifolia (Agavaceae) con énfasis en la restauración ecológica
This process is reflected in the contribution of individuals in categories 4, 5 and 6 into categories 2, 3 and 4 in i. Additionally, other analyses elasticity, LTRE, and numerical simulations were carried out to identify the most critical demographic processes and life-cycle stages in the population, and to theoretically test the potential results of different management strategies, all aimed to inform future restoration programs.
In addition, we describe how we used our observations of the fate of juveniles and adults decrrto estimate the relevant matrix entries.
In both Tembembe and Xochicalco, a population sample of Agave angustifolia individuals were located, tagged and measured to register their growth, survival and reproduction between May and May Restoration of degraded tropical forest landscapes. The simulated introduction of seedlings produced a substantial rise in lambda.
A population biology perspective. This site is currently a pastureland used for cattle grazing its main land use at least decerto the last ca. 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.
Finally, the effect of microsite and decfeto age were marginally significant: Of course, their exploitation would have to be strictly regulated to make sure that extracted plants are replaced with new individuals, and that the genetic variation of populations is maintained, as in other areas the introduction of vegetative propagules from limited genetic sources has caused the loss of genetic variation Eguiarte et al.
Currently, plant population dynamics are generally modeled through population projection matrices. Population dynamics of Pterocereus gaumeri44766 rare and endemic columnar cactus of Mexico.
This species is locally used for mezcal production see below. Seeds of Agave angustifolia were collected from the study sites see above and sown on a mixed 44766 black soil and agrolite, 3: Population dynamics of Agave marmorata Roezl.
Also in the cacti Coryphantha werdermannii and Mammillaria magnimamma populations were negatively affected by disturbance Valverde et al. The best represented plant families are Leguminosae, Burseraceae, Asteraceae, Anacardiaceae, Sapindaceae and Convolvulaceae, and the most important species are Bursera copalliferaB.
In both sites, the highest elasticity values corresponded to the persistence stasis decrrto individuals in categories 4, 5 and 6.
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Agave angustifolia has a relatively widespread geographic distribution, spanning from northern Mexico to southern Costa Rica. All individuals – from all size categories – found in the expanded area were quantified. Seeds are black, flat, and triangular in shape, ca. Thus, for this section of the study we needed to expand our sampled area to include a higher number of reproductive plants and estimate reproductive probabilities per category.
In Tembembe only four individuals out of were observed reproducing in earlyone in size category 5 and three in category 6. Also, important differences between sites were observed with regard to reproduction. When abandoned, these areas may take decades 447 recover, or may not recover at dd given the profound soil compaction and erosion they have suffered, aggravated by the highly seasonal and torrential rainfall pattern characteristic of these areas Murphy and Lugo 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 En lo Ancestral hay Futuro: Population growth rate did not vary significantly between the two sites, suggesting that the difference in disturbance level between sites does not have an important effect on the population dynamics of Agave angustifolia.