Showing papers by "Víctor Sánchez-Cordero published in 1999"
TL;DR: Reciprocal geographic predictions based on ecological niche models of sister taxon pairs of birds, mammals, and butterflies in southern Mexico indicate niche conservatism over several million years of independent evolution but little conservatism at the level of families.
Abstract: Theory predicts low niche differentiation between species over evolutionary time scales, but little empirical evidence is available. Reciprocal geographic predictions based on ecological niche models of sister taxon pairs of birds, mammals, and butterflies in southern Mexico indicate niche conservatism over several million years of independent evolution (between putative sister taxon pairs) but little conservatism at the level of families. Niche conservatism over such time scales indicates that speciation takes place in geographic, not ecological, dimensions and that ecological differences evolve later.
1,380 citations
TL;DR: It is concluded that nutritional value or presence of toxic compounds in fruits and seeds might affect dietary choices of spiny pocket mice.
Abstract: Spiny pocket mice (Liomys pictus) were maintained on monospecific diets of fruits and seeds of twelve plant species from a tropical deciduous forest in Mexico. Average consumption rates over 5-day trials were determined and classified as high, moderate or low. The products of plant species providing the most valuable food to spiny pocket mice were shown to contain high crude protein or lipid contents. The least valuable dietary components contained glucosides and alkaloids possibly deterrent to spiny mice, however, some of these fruits or seeds were moderately consumed. It is concluded that nutritional value or presence of toxic compounds in fruits and seeds might affect dietary choices of spiny pocket mice. Individuos del raton espinoso de abazones Liomys pictus fueron alimentados con dietas monoespecificas de frutos y semillas de 12 especies de plantas de una selva tropical decidua en Mexico. El consumo promedio durante cinco dias del experimento fue mayor (> 0.25 g semilla/g raton) para las semillas...
10 citations