Reproductive ecology of the threatened "star cactus" Astrophytum ornatum (Cactaceae): a strategy of continuous reproduction with low success

  • Maria Loraine Matias Palafox Universidada Autónoma Metropolitana
  • Cecilia Leonor Jiménez-Sierra Laboratorio de Ecología. Departamento de Biología. Universidad Autónoma Metropolitana, Unidad Iztapalapa. Av. San Rafael Atlixco 186, Col. Vicentina, 04390. México, D.F.
  • Jordan Golubov Laboratorio de Ecología, Sistemática y Fisiología Vegetal. Departamento El Hombre y su Ambiente. Universidad Autónoma Metropolitana, Unidad Xochimilco. Calzada del Hueso 1100, Col. Villa Quietud, 04960. México, D.F
  • María C. Mandujano Laboratorio de Dinámica de Poblaciones y Evolución de Historias de Vida. Departamento de Ecología de la Biodiversidad. Instituto de Ecología. Universidad Nacional Autónoma de México, Ciudad Universitaria. 04510. México, D.F.

Abstract

Background. There are no previous studies on the reproductive biology of the endemic and endangered cactus species Astrophytum ornatum.

Questions. Is flowering continuous or episodic? What are the breeding and mating systems and what floral visitors are associated? and Does the reproductive success change over time?

Study species. Astrophytum ornatum (Cactaceae).

Study site and years of study. Observations from 2010 to 2011, in the highest density population of A. ornatum in Metztitlán Canyon (Hgo.).

Methods. Monthly surveys and monitoring of reproductive structures. Tracking flowers in anthesis. Controlled pollinations to determine the mating system and determination of the Outcrossing Index (OCI), the pollen /ovule ratio and breeding system.

Results. Astrophytum ornatum produced flower buds throughout the year, but 89.2% of them were aborted. Four events of ephemeral flowering population were presented per year. The species is self-incompatible and controlled pollinations indicated pollinator limitation of several bee species. The OCI indicates that the species is facultative xenogamy, and pollen/ovule ratio indicates obligate xenogamy. On average there were 54 seeds/fruit and individuals produced 4 fruits/year.

Conclusions. The continuous production of buds had never been reported phenomenon for cacti. Intrapopulation bloom is one of the shortest recorded for the family and it produces high floral synchrony. The low number of seeds / fruit and flowers / individual, coupled with the narrow niche breadth of species and various anthropogenic factors place Astrophytum ornatumas a susceptible species to be extinct.

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Author Biography

Maria Loraine Matias Palafox, Universidada Autónoma Metropolitana
Alumna del Doctorado en Ciencias biológicas y de la salud de la Universidad Autónoma Metropolitana Unidad Iztapalapa
Reproductive ecology of the threatened "star cactus" <em>Astrophytum ornatum</em> (Cactaceae): a strategy of continuous reproduction with low success
Published
2017-07-09
How to Cite
Matias Palafox, M. L., Jiménez-Sierra, C. L., Golubov, J., & Mandujano, M. C. (2017). Reproductive ecology of the threatened "star cactus&quot; Astrophytum ornatum (Cactaceae): a strategy of continuous reproduction with low success. Botanical Sciences, 95(2), 245-258. https://doi.org/10.17129/botsci.780
Section
ECOLOGY / ECOLOGÍA