Abstract
The Cactaceae family in Mexico is particularly important because members of this family exhibit a high degree of endemism. Unfortunately, many species of the Cactaceae are threatened or endangered. We employed an integral projection model for studies of the population dynamics of Mammillaria gaumeri, an endemic cactus of the Yucatán characterized by a small population size. The integral projection model provides estimates of the asymptotic growth rate, stable size distribution, reproductive values, and sensitivities and elasticities of the growth rate to changes in vital rates. Nine locations of this species were studied along the Yucatan coast over a 9-year period. Individuals were classified by plant volume. Most population growth rate (λ) values were below unity. The highest elasticity values corresponded to the survival of intermediate size individuals. The percentage of germination in the field was low, and consequently, fecundity values were also low. Reproductive values were observed to increase with plant volume. The stable size distribution of M. gaumeri was skewed toward small individuals. For all years, the kernel showed that individual survival determined the population growth rate.
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Acknowledgments
Financial support was provided by Consejo Nacional de Ciencia y Tecnología México through a doctoral and joint scholarship for Ferrer Cervantes Merari. We also like to thank the proyect Banco de germoplasma FORDECYT 115911 for their financial support. We thank Gerardo Godoy, Wendy Torres, Ana López-Hass, Samuel Bañuelos, Hiram Blancarte and Mariela Castilla for their support in the field work, and Cecilia Guizar, Miguel Contreras and Paul Hoekstra for their help in editing and translation of this manuscript. Two anonymous reviewers gave us sound and useful comments that improved on the manuscript.
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Ferrer-Cervantes, M.E., Méndez-González, M.E., Quintana-Ascencio, PF. et al. Population dynamics of the cactus Mammillaria gaumeri: an integral projection model approach. Popul Ecol 54, 321–334 (2012). https://doi.org/10.1007/s10144-012-0308-7
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DOI: https://doi.org/10.1007/s10144-012-0308-7