Abstract
In this study we use a demographic approach to analyse the differing abundance of three congeneric columnar cacti: Neobuxbaumia macrocephala (the rarest), Neobuxbaumia tetetzo (intermediate), and Neobuxbaumia mezcalaensis (the most common). Populations of these species were studied in the Tehuacan Valley (Central Mexico) over a 3-year period. We employed traditional models and life table response experiments (LTRE) to explore the association between particular demographic traits and the degree of rarity of each species. Most matrices showed population growth rate (λ) values close to unity; the only exception was N. mezcalaensis in 2001–2002 (λ=1.091±0.088). In the three species the highest elasticity values corresponded to entries referring to the stasis of pre-reproductive plant and small adults. However, the LTRE indicated that most important differences in the λ values between years and species were associated with variation in fruit production and seedling recruitment. N. mezcalaensis yielded the highest mean λ due to its high fecundity in 2001–2002. This result suggests that the variation in demographic behaviour observed between species is sufficient to explain the higher abundance of N. mezcalaensis compared to the rare N. macrocephala. The high fecundity values and recruitment success observed in the former, even if they occur only seldom, may result in higher average λ values accounting for its high population densities.
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Acknowledgements
We are grateful to Mariana Hernández, Pedro Eloy Mendoza, Marcela Ruedas, Cynthia Ramírez, Oswaldo Núñez, Rocío Bernal, Vania Jiménez, Laura Hernández, Elena Vilchis, Eduardo Martínez, Octavio Esparza, Abraham Martínez and Liliana Santamaría for valuable assistance during the field work. We thank Marco Antonio Romero for help with hardware maintenance and Carlos Martorell for advice in relation to LTRE. We thank Dr Luis Eguiarte for helpful suggestions and comments during the development of this study. The comments and suggestions of two anonymous reviewers greatly improved the quality of this contribution. The first author received a PhD studentship from CONACyT-Mexico during the course of this study.
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Esparza-Olguín, L., Valverde, T. & Mandujano, M.C. Comparative demographic analysis of three Neobuxbaumia species (Cactaceae) with differing degree of rarity. Popul Ecol 47, 229–245 (2005). https://doi.org/10.1007/s10144-005-0230-3
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DOI: https://doi.org/10.1007/s10144-005-0230-3