Summary
Mexican cloud forests, situated between 600 and 3000 m of elevation, exhibit a remarkable high biotic diversity. They follow a fragmented pattern, similar to that of an archipelago, that makes them suitable to vicariance modelling. A Parsimony Analysis of Endemicity (PAE) was applied to the presence/absence of 1267 species of vascular plants (gymnosperms, angiosperms, and pteridophytes) from twenty‐four patches of Mexican cloud forests, in order to postulate a preliminary hypothesis of relationships. The single cladogram obtained grouped the twenty‐four cloud forests into five clades. These results indicate that the Sierra Madre Oriental, Sierra Madre del Sur, and Serranías Meridionales floristic provinces do not represent natural units. A preliminary vicariance model is presented to explain the sequence of fragmentation of the Mexican cloud forests.
. A track analysis based on the distributional patterns of 967 species of vascular plant taxa (gymnosperms, angiosperms and pteridophytes) was performed to assess conservation priorities for cloud forests in the state of Hidalgo, Mexico, ranged in the municipalities of Chapulhuacán, Eloxochitlán, Molocotlán, Pisaflores, Tenango de Doria, Tlahuelompa and Tlanchinol, as well as five floristically equivalent areas in the states of Veracruz (Teocelo and Helechales), Tamaulipas (Gómez Farías), Morelos‐México (Ocuilan) and Oaxaca (Huautla de Jiménez). In order to detect generalized tracks we employed a new parsimony method, where clades (considered equivalent to generalized tracks) are defined forbidding homoplasy and acting like a compatibility algorithm. Several generalized tracks were found connecting these areas. Cloud forests of Chapulhuacán were connected according to three different generalized tracks and thus have a higher value, qualifying as a priority area for the conservation of cloud forests in the state of Hidalgo.
Se ofrece un listado fl orístico de las plantas vasculares, compuesto por 103 familias, 260 géneros, 359 especies y 11 taxa subespecífi cos. En este bosque hay 11 especies que están en alguna categoría de riesgo dentro de la Norma Ofi cial Mexicana NOM-050-ECOL-2001 y se sugiere el estudio de dos más para su posible inclusión. Palabras clave: bosque mesófi lo de montaña, fl orística, diversidad fl orística,
Los bosques mesófilos de Eloxochitlán y Tlahuelompa, enclavados en la Sierra Madre Oriental y en la Huasteca Hidalguense, representan dos manchones con diferente composición florística en el estado de Hidalgo. Estos bosques en general presentan tres estratos arbóreos: uno alto (20-30 m y hasta 40 m), uno medio (8-20 m) y uno bajo (2-8 m). Se ofrece una lista de plantas vasculares de ambos sitios constituida por 394 especies, 266 géneros y 110 familias. Al realizar un análisis de la distribución actual de los géneros, se observa que gran parte de ellos se conocen exclusivamente del continente americano (93 géneros, 35%) y sus especies generalmente son componentes del sotobosque; la mayoría de los géneros del estrato arbóreo se distribuyen principalmente en el hemisferio norte (25 géneros, 9.4%). Los rodales hidalguenses de Fagus grandifolia ssp. mexicana se proponen como áreas de reserva, dado el carácter relictual y endémico de este taxon.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.