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Allozyme variation in the three extant populations of the narrowly endemic cycad Dioon angustifolium Miq. (Zamiaceae) from North-eastern Mexico.
Dioon angustifolium presents high levels of genetic diversity compared with other cycad species, in spite of small population sizes, and the recent bottleneck effect did not effectively reduce the genetic variation to the extent of eliminating these populations. Expand
Diversity and genetic structure of the Mexican endemic epiphyte Tillandsia achyrostachys E. Morr. ex Baker var. achyrostachys (Bromeliaceae).
The genetic structure of populations of T. achyrostachys suggests that habitat fragmentation has reduced allelic richness and genetic diversity, and increased significant genetic differentiation between populations. Expand
Heterozygote excess in ancient populations of the critically endangered Dioon caputoi (Zamiaceae, Cycadales) from central Mexico
The results support recent findings that rare plant species maintain high levels of genetic diversity and the heterozygote excess found at all loci is discussed in detail from a neutral evolutionary perspective. Expand
Population genetics of Dioon edule Lindl. (Zamiaceae, Cycadales): biogeographical and evolutionary implications
Dioon edule Lindl. (Zamiaceae) is a cycad endemic to Mexico, that occurs as one species D. edule and the geographical variety D. edule var. angustifolium (Miq.) Miq. Dioon edule has a north to southExpand
Demography of the cycad Ceratozamia mirandae (Zamiaceae) under disturbed and undisturbed conditions in a biosphere reserve of Mexico
Demographic studies were made in two of its populations in the Sepultura Biosphere Reserve under different conservation conditions, it is proposed that in the nucleus zone, reproductive adults should be of highest conservation priority, whereas in the buffer zone seedling reintroduction should be carried out regularly until the population increases. Expand
Population dynamics of the Mexican cycad Dioon edule Lindl. (Zamiaceae): life history stages and management impact
The demographic dynamics of three populations of Dioon edule Lindl (Zamiaceae) were studied in a fragmented landscape using projection matrix modelling and it was detected that disturbance influences the population dynamics of D. edule as a function of adult plant persistence. Expand
Genetic diversity of the endangered endemic Microcycas calocoma (Miq.) A. DC (Zamiaceae, Cycadales): Implications for conservation
Results indicate that M. calocoma populations have become fragmented due to increasing pressures of habitat conversion and disturbance, and geographical isolation among populations has generated allele loss in relation to altitude. Expand
Genetic Diversity in Six Govenia (Orchidaceae) Species with Different Pollinator Attraction Strategies
A high level of genetic variation and a low genetic differentiation among species were found, and the association between genetic diversity and pollinator attraction strategy was evaluated. Expand
Genetic variability of the narrow endemic tree Antirhea aromatica Castillo-Campos Lorence, (Rubiaceae, Guettardeae) in a tropical forest of Mexico.
The results indicated that the populations evaluated have high genetic variability, compared with other endemic and geographically narrowly distributed plant species, in areas with high levels of environmental heterogeneity (e.g. tropical forests). Expand
Diversity and genetic structure of three species of Dioon Lindl. (Zamiaceae, Cycadales) from the Pacific seaboard of Mexico
Comparison of the inferred genetic structure based on F-statistics for the three species indicated differences along the north-south Pacific seaboard axis and a phenogram representing Nei's genetic distances among populations displayed three major groups, each one corresponding to each of the studied species. Expand