Pedro Aragón

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BACKGROUND Genetic, phenotypic and ecological divergence within a lineage is the result of past and ongoing evolutionary processes, which lead ultimately to diversification and speciation. Integrative analyses allow linking diversification to geological, climatic, and ecological events, and thus disentangling the relative importance of different(More)
Environmental variations are usually thought to require a nonanecdotal intensity or duration to have major effects on individuals and evolutionary outputs. However, environmental variations of weak intensity and short duration could be of major importance when they influence key targets or critical stages. Because conditions experienced early in life can be(More)
Geographical body size variation has long interested evolutionary biologists, and a range of mechanisms have been proposed to explain the observed patterns. It is considered to be more puzzling in ectotherms than in endotherms, and integrative approaches are necessary for testing non-exclusive alternative mechanisms. Using lacertid lizards as a model, we(More)
A basic aim of ecology is to understand the determinants of organismal distribution, the niche concept and species distribution models providing key frameworks to approach the problem. As temperature is one of the most important factors affecting species distribution, the estimation of thermal limits is crucially important for inferring range constraints.(More)
Dispersal is a common response to deteriorating conditions such as intense competition, food limitation, predation or parasitism. Although it provides obvious advantages, dispersal is often assumed to be costly. Selection is therefore likely to have acted to decrease these costs, and indeed several studies demonstrated that dispersers and philopatric(More)
The animals in this study were the offspring of dams, who, from 21-99 days of age, were exposed to 1000 mg/kg of lead acetate via a daily restricted watering schedule with exposure continuing throughout gestation and nursing. Control dams received distilled water under the same watering schedule. Offspring were weaned at 21 days of age and did not received(More)
Although a number of experiments has revealed offspring hyperactivity following maternal lead (Pb) exposure, a consistent correlate has been reduced pup size. The present study was designed to measure exploratory behavior employing a range of Pb dosages that allowed for the comparison between Pb and control offspring both in the presence and the absence of(More)
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