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Botanical Sciences

versão On-line ISSN 2007-4476versão impressa ISSN 2007-4298


CONTRERAS-MEDINA, Raúl et al. Biogeographic analysis of ferns and lycophytes in Oaxaca: A Mexican beta-diverse area. Bot. sci [online]. 2022, vol.100, n.1, pp.204-222.  Epub 03-Fev-2022. ISSN 2007-4476.


Spatial patterns related to richness and endemism of Mexican ferns and lycophytes are not well known, particularly in highly biodiverse areas; among these, Oaxaca is considered a highly biodiverse Mexican state.


Where are located the centers of richness and endemism of lycophytes and ferns in Oaxaca? Both groups of plants support the idea of beta-diverse state condition for Oaxaca?

Study site and research period:

The study includes all territory of Oaxaca, between 2015 and 2019.


We analyzed the species distribution using grid cells of 20’ × 20’ of latitude and longitude as study units. For this, we applied species richness, endemism indexes (weighted endemism and corrected weighted endemism), and components of biodiversity (α, β and γ), associated with a complementarity index. The distributional data of the species were mainly obtained from herbarium specimens.


The richness areas are concentrated in the Sierra Norte and Istmo regions. Three important areas in richness and endemic species are suggested from the endemism indexes. Most of the grid-cell combinations resulted in high values from the complementarity analysis suggesting a high species turnover.


The diversity analyses suggested that Oaxaca is a beta-diverse state. The NOM-059 needs a serious, urgent, and critical revision for ferns and different biological groups. The Areas Voluntarily Designated for Conservation in Oaxaca play a major role in relation to Natural Protected Areas for conservation of ferns and lycophytes.

Palavras-chave : Beta diversity; endemism; Mexico; pteridoflora; richness.

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