Papers in this group tagged with "mexico"
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Delimiting the distribution of a species is a complex task because many determining factors are difficult to assess in the field. This is important because distribution is a key factor in the decision- making process for conservation.One example is…
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Plant development is controlled by certain factors such as nutrient availability, environmental cues and the presence of signalling molecules. It has been proposed that phytohormones interact with sugars to modulate important processes in vascular…
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Conservation and management of species require basic knowledge on their geographic distribution and abundance. Here, we propose a novel approach, based on the theory of the ecological niche, to model the spatial patterns of the white-tailed deer…
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Aim We test whether populations of the Mesoamerican azure-crowned hum- mingbird, Amazilia cyanocephala (Trochilidae), located east and west of the Isthmus of Tehuantepec are genetically, morphologically and environmentally differentiated and examine…
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Biogeographic patterns of avifaunas associated with seasonally dry tropical forests in Mesoamerica are poorly understood despite their high levels of species richness and endemism. Through the parsimony analysis of endemicity, we analyzed…
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1 Understanding the distribution of key biotic elements of forest ecosystems is essential in contemporary forest management and in planning to meet future management needs. Habitat distribution (niche) models based on known occurrences provide…
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Worldwide, one in every three species of amphibian is endangered, 39 species have gone extinct in the last 500 years and another 130 species are suspected to have gone extinct in recent decades. Of the amphibians, salamanders have the highest…
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Defining areas of potential distribution for large carnivores is a critical step for generating conservation strategies. Ecological niche modelling is an important tool for identifying potential areas for conservation of carnivores, such as American…
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Delimiting the distribution of a species is a complex task because many determining factors are difficult to assess in the field. This is important because distribution is a key factor in the decision-making process for conservation. One example is…
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Studies about the permanence of natural protected areas are important, because they contribute to the promotion of the conservation target and to optimize economical and human resources of specific areas. Although there are no natural protected…
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A lineage of 12 arid land shrubby species in the gymnosperm genus Ephedra (Gnetales) from North America is used to evaluate the influence of climate on speciation. With a long evolutionary history, and a well documented fossil record this lineage is…
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Delimitation of the distribution areas of species has fundamental implications for the understanding of biodiversity and for decision-making in conservation. This is illustrated by the case of the Bearded Wood-Partridge (Dendrortyx barbatus), which…
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Spatial abundance patterns across species’ ranges have attracted intense attention in macroecology and biogeography. One key hypothesis has been that abundance declines with geographical distance from the range centre, but tests of this idea have…
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We extend a recently developed method for constructing ecological networks to infer potential biotic interactions between species and to also include environmental factors, in particular land cover, thus permitting a simultaneous analysis of the…
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Analyses of richness and endemism of Cyatheales (tree ferns) in tropical America were performed and evidence of a diversity gradient is presented. For this, the occurrence ranges of 239 species were plotted into a 5 9 5 grid-cell map and then…
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Two new species from western Mexico, Urochloa olivacea and U. pauciflora (Paniceae; Panicoideae; Poaceae) are described and illustrated here. An updated checklist and a key for the 21 species of Urochloa occurring in Mexico are presented.
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Lycophytes (Equisetopsida: Lycopodiidae) from the Central Hills of Argentina: a panbiogeographic approach. Lycophytes are the most ancient lineage of vascular plants and include Lycopodiaceae, Isoëtaceae and Selaginellaceae. They are a monophyletic…
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During the winter 2007-2008 we captured three individuals of the Dark-eyed Junco, Junco hyemalis. The birds were captured 600 kilometres south of their winter distribution, in a fir forest (Abies religiosa) of the Nevado de Colima, Jalisco. In the…
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Modelling the potential winter distribution of the endangered Black-capped Vireo (Vireo atricapilla)We applied the ecological niche/habitat modelling approach to predict the potential winter distribution of the endangered Black-capped Vireo Vireo atricapilla. We used historical and current field records along with climatic and topographic…
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Aim The jaguar, Panthera onca, is a species of global conservation concern. In Mexico, the northernmost part of its distribution range, its conservation status, is particularly critical, while its potential and actual distribution is poorly known.…