Neftalí Sillero

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BACKGROUND Relict populations of Crocodylus niloticus persist in Chad, Egypt and Mauritania. Although crocodiles were widespread throughout the Sahara until the early 20(th) century, increased aridity combined with human persecution led to local extinction. Knowledge on distribution, occupied habitats, population size and prey availability is scarce in most(More)
Solar radiation is in theory an unlimited resource on Earth, but can be locally limited. Heliothermic organisms use solar radiation to elevate their body temperatures, leading them to compete for sun-exposed areas, where interference for limited resource can occur. In coexisting lizard species, interference for basking sites could promote and direct(More)
The predator–prey relationship is a strong agent of natural selection on phenotype, and two evolutionary strategies derived from this antagonistic interaction are crypsis and aposematism. Although usually considered as opposites, both strategies could be ascribed to the dark zigzag pattern of European vipers (Vipera). Experiments using plasticine models(More)
This paper presents a road surface scanning system that operates with a trichromatic line scan camera with light emitting diode (LED) lighting achieving road surface resolution under a millimeter. It was part of a project named Roadkills-Intelligent systems for surveying mortality of amphibians in Portuguese roads, sponsored by the Portuguese Science and(More)
Biological invasions are a major conservation threat for biodiversity worldwide. Islands are particularly vulnerable to invasive species, especially Mediterranean islands which have suffered human pressure since ancient times. In the Balearic archipelago, reptiles represent an outstanding case with more alien than native species. Moreover, in the last(More)
Most studies dealing with home ranges consider the study areas as if they were totally flat, working only in two dimensions, when in reality they are irregular surfaces displayed in three dimensions. By disregarding the third dimension (i.e., topography), the size of home ranges underestimates the surface actually occupied by the animal, potentially leading(More)
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