La Sierra Madre Oriental como reservorio de diversidad vegetal

Rodríguez, María Magdalena Salinas

doi:10.29105/cienciauanl88.21-4

Cited by 2 publications

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“…In the case of D . navarrensis , a probable answer to found divergence is that, within the SMO, there is a wide range of variation in environmental factors such as elevation, climate, topography, edaphology, and degree of anthropic disturbance (Salinas-Rodríguez, 2018), which alone or in synergy, constitute barriers to spores survival or dispersal along different distances, thus inducing genetic isolation (Tryon, 1970; Tryon & Tryon, 1982). This environmental heterogeneity facilitates the existence of populations with a few isolated individuals, which can lead to the loss of genetic variation (Soltis & Soltis, 1990).…”

Section: Discussionmentioning

confidence: 99%

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Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

Reyes-Ortiz

Octavio‐Aguilar

López–Mata

et al. 2022

Tropical Conservation Science

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Background and Research Aims Dicksonia navarrensis is a species of tree fern at risk of extinction, distributed in the montane cloud forest (MCF) of the Americas from the central region of Mexico to Ecuador. In Mexico, populations of this species grow in primary vegetation of the MCF, in a matrix with a high degree of fragmentation and under threat of disappearance. Methods In the present study, the diversity and genetic structure of seven populations of D. navarrensis that are distributed in the cloud forest of the Sierra Madre Oriental were evaluated, with both standard laboratory and statistical analysis techniques, using 11 microsatellites developed for the genus Dicksonia. Results A total of 33 alleles were found. Genetic diversity differed between populations, and some presented low heterozygosity. Using assignment tests, three genetic groups were identified, associated with the geographical distribution of the populations; those from the north maintain connectivity with each other but diverge highly from the populations in the south, probably due to processes of isolation by distance (local environment), genetic drift, and natural selection. Conclusion The northernmost population, which is more isolated from the rest, has a broader genetic reservoir, which can be useful for maintaining the genetic diversity of the species. In the other populations, with less genetic diversity, the introduction of individuals and/or the dispersion of spores is important, to maintain and increase the genetic variability that they still possess, but which could disappear in a short time if their habitat continues to deteriorate at a high degree. Implications for Conservation The results obtained provide basic information that can be used in management and conservation plans, because the populations with the greatest genetic diversity and the possible processes that are influencing the genetic structure of the species were identified.

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Section: Discussionmentioning

confidence: 99%

“…The limited distribution and small population size of species in the SMO should be considered. On the other hand, the heterogeneity of the SMO (Salinas-Rodríguez, 2018) hardly represents an obstacle for illegal extraction of species. Therefore, we should look for alternatives to avoid the loss of D .…”

Section: Discussionmentioning

confidence: 99%

Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

Reyes-Ortiz

Octavio‐Aguilar

López–Mata

et al. 2022

Tropical Conservation Science

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Morfometría de fruto y semilla de poblaciones de Ferocactus pilosus del Altiplano Tamaulipeco

Ruiz

Vaquera-Huerta

Venegas-Barrera

et al. 2023

Remexca

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En México, más de 75% de las especies de cactáceas están sometidas a presión antropogénica y destrucción de su hábitat, como es el caso de Ferocactus pilosus, por lo que es importante aumentar el conocimiento para su recuperación in situ. El objetivo del estudio fue determinar la manera en que el ambiente semiárido del Altiplano de Tamaulipas tiende a limitar la distribución de cinco poblaciones de F. pilosus y promueve cambios morfológicos que operan en frutos y semillas. El dendrograma definió la similitud entre poblaciones II, III y IV de la biznaga, debido a diferencias en pedregosidad y ligera condición de humedad por el tipo de clima y la elevación. El análisis Manova y Tukey demostraron la existencia de diferencias significativas en número de semillas (NS) y peso de semillas (PS) de biznaga. El NS fue estadísticamente igual entre las poblaciones II (674 ±191), III (657 ±221) y IV (643 ±246), mientras que en las mismas poblaciones PS fue 0.92 ±0.27, 0.9 ±0.3 y 0.88 ±0.34 mg, respectivamente. Las poblaciones II, III y IV de la biznaga cabuchera, aprovecharon mejor las condiciones ambientales del Altiplano de Tamaulipas prevalecientes en 2013 y 2014, lo que provocó una variación importante de NS y PS en las mismas poblaciones de F. pilosus y el rechazo parcial de la hipótesis.

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La Sierra Madre Oriental como reservorio de diversidad vegetal

Cited by 2 publications

References 0 publications

Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

Morfometría de fruto y semilla de poblaciones de Ferocactus pilosus del Altiplano Tamaulipeco

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