Showing papers by "Víctor Sánchez-Cordero published in 2004"

Predicting distributions of mexican mammals using ecological niche modeling

Abstract: Given the uneven and biased nature of present understanding of geographic distributions of mammal species, tools for extrapolating from what is known to a more general prediction would be most useful. We used the genetic algorithm for rule-set prediction (GARP) to generate ecological niche models that were then projected onto geography to predict potential geographic distributions for 17 mammal species of Insectivora, Chiroptera, Rodentia, and Artiodactyla in Oaxaca, Mexico. GARP depends on point occurrence localities from museum records of species, along with electronic maps describing features of climate, topography, and vegetation type. Point localities were divided in 2 sets: one of localities from museum records dated before 1960, which was used to generate the predicted distributions, and the other of localities of museum records resulting from recent inventories (post-1960), which was used to test model accuracy. Predicted distributions for 11 of 17 species were statistically significantly more coincident with independent test points than random expectations; tests for the remaining 6 species would have required larger numbers of test localities to establish significance. GARP is a robust tool for modeling species' geographic distributions, with excellent potential for applicability to strategies for conservation of mammals in Oaxaca and elsewhere.

A preliminary biological survey of Cerro Piedra Larga,Oaxaca, Mexico: Birds, mammals, reptiles, amphibians, andplants

Abstract: Cerro Piedra Larga is an isolated mountain massif in eastern Oaxaca, lying just west of the Isthmus of Tehuantepec. No previous biological inventories had ...

Catálogo de pelos de guardia dorsal en mamíferos del estadode Oaxaca, México

Abstract: Resumen es: Se elaboro un catalogo de pelos de guardia dorsal de algunos mamiferos terrestres voladores y no voladores que se distribuyen en Oaxaca, Mexico. Las mu...

Effect of Plant Species, Fruit Density and Habitat on Post-Dispersal Fruit and Seed Removal by Spiny Pocket Mice (Liomys pictus, Heteromyidae) in a Tropical Dry Forest in Mexico

Abstract: We tested whether quality, habitat, and food patch density affected post-dispersal fruit and seed removal of common plants in a tropical deciduous forest in western Mexico (Chamela, Jalisco). To identify the quality of seed or fruit, caged spiny pocket mice (Liomys pictus) were fed mono-specific diets of sunflower seeds (Helianthus annuus), seeds of Delonix regia, Lonchocarpus eriocarinalis, Caesalpinia coriaria, or fruits of Spondias purpurea. Caged mice gained weight with sunflower seeds, marginally lost weight with D. regia seeds, and significantly lost weight with S. purpurea fruits and L. eriocarinalis and C. coriaria seeds. Fruit and seed removal values in experimental patches were high in sunflower (80%) and D. regia (70%) seeds, and moderate in S. purpurea fruits (50%); L. eriocarinalis (0.1%) and C. coriaria (0%) seeds were not removed. More fruits and seeds were removed from experimental patches in tropical deciduous forest (57%) than from semi-deciduous forest (23%), and from high (43%) and med...