Riqueza y endemismo de las especies de Clavariadelphus (Clavariadelphaceae: Gomphales) en la Faja Volcánica Transmexicana

Abstract

Riqueza y endemismo de las especies de Clavariadelphus (Clavariadelphaceae: Gomphales) en la Faja Volcánica Transmexicana Richness and endemism of the species of Clavariadelphus (Clavariadelphaceae: Gomphales) in the Trans-Mexican Volcanic Belt

Biogeographic analysis of ferns and lycophytes in Oaxaca: A Mexican beta-diverse area

“…Results from the richness and endemism analyses were clustered with this tool and results were plotted on a map according to the groups recovered. Grid cells with zero or one species recorded were not considered in the analysis of CWE (Santa Anna del Conde et al 2009, González-Ávila et al 2018, because these grid cells do not include overlapping distributions, which is a basic criterion for the area of endemism concept (Morrone 1994, Aagesen et al 2013.…”

“…The centers of richness or endemism are formed by sets of neighboring grid cells or isolated grid cells with high values in each index (Crisp et al 2001, Linder 2001, Santa Anna del Conde et al 2009. Each species was scored as present in a grid cell independently of whether it was recorded once or numerous times in a determined grid cell (Linder 2001, Contreras-Medina & Luna-Vega 2007, Santa Anna del Conde et al 2009, González-Ávila et al 2018). The WE index has been considered as a measure sensitive to diversity, this fact implies that patterns of richness resemble partially or totally the WE values (Linder 2001, Santa Anna del Conde et al 2009.…”

“…The WE index has been considered as a measure sensitive to diversity, this fact implies that patterns of richness resemble partially or totally the WE values (Linder 2001, Santa Anna del Conde et al 2009. In contrast, the CWE index is not significantly correlated with grid diversity (Linder 2001, Santa Anna del Conde et al 2009, González-Ávila et al 2018.…”

“…Several factors have been proposed that influence species turnover, such as those related to the environment and its heterogeneity, and those inherent to species, such as their vagility and tolerance ranges to different environmental factors (Goettsch & Hernández 2006). Complementary and beta diversity analyses have been applied to other biological groups of Mexican biota (Rodríguez et al 2003, Aguilar-Aguilar & Salgado-Maldonado 2006, Goettsch & Hernández 2006, González-Ávila et al 2018. Only a few studies have applied beta diversity analyses to ferns and lycophytes, mainly for the Mexican states of Durango (Montelongo-Landeros et al 2015) and Hidalgo (Sánchez-González et al 2016).…”

Estructura areográfica y efectos del cambio de uso de suelo en especies endémicas de la Faja Volcánica Transmexicana

“…La FVT es una cadena de volcanes con orientación este-oeste que se extiende desde la vertiente del Pacífico hasta la del Golfo de México (Ferrusquía-Villafranca 2007) y se encuentra localizada entre los 18°30' y 21°30' de latitud norte, por arriba de los 1,800 metros sobre el nivel del mar (Morrone 2017). La FVT ha experimentado un aumento en deforestación y urbanización desde la década de 1960, convirtiendo el 70% del hábitat no transformado en agrosistemas y asentamientos rurales o urbanos (Toledo et al 1989;Challenger 1998;Arriaga et al 2000), ya que es una región del país en donde se concentran varios de los núcleos urbanos más importantes de México (Cantellano 2007;González-Ávila et al 2018). En el año 2014 se registró el 62.2% de cambio en la vegetación original debido a las actividades antrópicas, y desde entonces la tasa de deforestación anual ha aumentado significativamente (Suárez-Mota y Téllez-Valdés 2014).…”