El endemismo en la flora fanerogámica mexicana: una apreciación analítica preliminar

Rzedowski, Jerzy

doi:10.21829/abm15.1991.620

Cited by 204 publications

(167 citation statements)

References 13 publications

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“…Estimates of carbon stocks of terrestrial ecosystems are complex (Murray-Tortarolo et al 2016), due to a large species and ecosystem diversity caused by the convergence of Nearctic and Tropical regions (Rzedowski 1991), climate heterogeneity (Sarukhán et al 2009), and complex geological and climatic history (Espinosa-Organista et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Tissue carbon concentration of 175 Mexican forest species

Pompa-García¹,

Rodríguez²,

Jurado³

et al. 2017

iForest

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Reliable calculations of carbon stocks in forest ecosystems are crucial for proper implementation of global warming mitigation policies. Accurate estimations depend upon applying the correct factor of carbon (C) concentration for different forest species and tissues instead of the often assumed 50% carbon content. Despite the high forest species richness in Mexico and the increasing CO2 emissions, data on carbon concentrations in forest plant tissues are scarce. In this study, we determined variation in C concentration of different tissues for 175 plant species common in Mexican forests. C contents were estimated and contrasted for plant distribution, taxa, and plant structure (main stems, branches, twigs, bark, leaves, buds, fruits, roots and root cuticles). The mean C concentration across species was 44.7%. Species significantly differed in C concentration by tissue, environment and taxa. These multi-species data contribute to improve precision on estimates of C balance in terrestrial ecosystems, reducing the uncertainty in C inventories in Mexico and elsewhere.

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Section: Introductionmentioning

confidence: 99%

Tissue carbon concentration of 175 Mexican forest species

Pompa-García¹,

Rodríguez²,

Jurado³

et al. 2017

iForest

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“…From the subseries Truncatae, E. densa differs by having the eventual presence of biconvex achenes, 2 or 3-branched styles, and membranous-translucent to thinly papery distal sheaths that are loose and sometimes disintegrate at the apex. Eleocharis densa is restricted to Megamexico 2, the biogeographical area comprising Mexico and northern Central America sensu Rzedowski (1991).…”

Section: Introductionmentioning

confidence: 99%

Eleocharis reznicekii (cyperaceae), a new species from the mexican high plateau

et al. 2007

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Eleocharis reznicekii (Cyperaceae, subg. Eleocharis, series Eleocharis), is described and illustrated. It is morphologically intermediate between E. densa and two species of Eleocharis subseries Eleocharis (E. macrostachya and E. palustris). The new species differs in a combination of characters including conspicuously compressed culms (3 to over 5 times wider than thick) and stylopodium sessile on a thin annular base. Eleocharis reznicekii differs additionally from E. densa by having relatively lax spikelets, mostly bifid styles, and achenes almost smooth at 30x. From E. macrostachya and E. palustris it is distinguished in its oblong to linear-oblong spikelets, the proximal floral scale clasping only 1/3 to slightly more than 1/2 of the culm, and the proximal plus 1-2(3) subproximal scales without a flower. Eleocharis reznicekii is known only from the state of Durango, in the Mexican high plateau and piedmont of the Sierra Madre Occidental.

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“…Mexico can be considered to be the fourth country in the world according to its floristic and faunistic diversity (Rzedowski, 1991), this diversity being the result of the wide variation in, and combinations between physiographic, geological and climatic conditions that characterize the country. This great species richness and the high level of species endemicity are of great scientific and economic value, as has been discussed by Rzedowski (1998), who points out the existence of approximately 220 families, 2,410 genera, and 22,000 species of fanerogamic flora, and an endemicity of 10% for genera, and 52% for species.…”

Section: Diversity Of the Mexican Floramentioning

confidence: 99%