Éxito reproductivo y germinación de Ariocarpus kotschoubeyanus y Neolloydia conoidea (Cactaceae) en una zona semiárida de Querétaro
Ariocarpus kotschoubeyanus and Neolloydia conoidea are two globose cacti that cohabit in a semi-arid region of Querétaro, whose flowers have similarities in shape and color. In this study, their flowering patterns and intra-population floral synchrony are analyzed, as well as their reproductive syst...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:hq37vp273 |
| Acceso en línea: | https://doi.org/10.24275/uami.hq37vp273 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Propagación de plantas -- Cactus info:eu-repo/classification/LEM/Angiospermas info:eu-repo/classification/LEM/Plant propagation -- Cactus info:eu-repo/classification/LEM/Angiosperms info:eu-repo/classification/cti/3 |
| Sumario: | Ariocarpus kotschoubeyanus and Neolloydia conoidea are two globose cacti that cohabit in a semi-arid region of Querétaro, whose flowers have similarities in shape and color. In this study, their flowering patterns and intra-population floral synchrony are analyzed, as well as their reproductive systems, flower visitors and the reproductive success of both species. Also included are aspects of seed germination and the serotiny phenomenon in A. kotschoubeyanus. The temporal separation in flowering of the studied species could be an important factor to facilitate their coexistence within the community, since they share 75% of the pollinating species (solitary and social bees). The pattern flowering A. kotschoubeyanus was bimodal and N. conoidea in pulses. These patterns have been here suggested as a "bet hedging" strategy. The flowers of both species are melitophilic, with diurnal anthesis and two-day longevity. The OCI indicates obligate xenogamy for both species and the controlled pollination experiments in the field indicated that N. conoidea requires outcrossing, while A. kotchoubeyanus presents a mixed cross system. Both cacti presented a flowering with low intrapopulation synchrony (Augspurger and Marquis Index) and no correlations were found between maximum synchrony and reproductive success. The germination percentage of the seeds of both species increases with age, so there is the possibility of the formation of seed banks, which would play an important role in the structure and dynamics of their populations. Eighty-six percent of the A. kotschoubeyanus plants examined harbored seeds between tubers and retained seeds between older tubers had the highest germination rate, confirming the serotiny phenomenon in this species. Through this study, important information was obtained on the reproductive biology of Ariocarpus kotschoubeyanus (species at risk) and Neolloydia conoidea species with wide distribution in the Chihuahuan desert and new questions are opened such as: What are the factors that have allowed the development of these patterns? What are their evolutionary advantages? and is the phenomenon of serotinia a constant phenomenon in arid zones? Key words: floral synchrony, flowering patterns, phenology, pollinators, seed bank, serotiny |
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