Parasites are integral members of natural communities, but large-scale determinants of their abundance and diversity, including the importance of biotic and abiotic factors, both natural and anthropogenic, are often not well understood. Here, we examine which factors best predict larval trematode communities in the mudsnail host Ilyanassa obsoleta across a regional landscape. At 15 salt marsh s...

In the vertebrates, the vital mitochondrial dye DASPEI (2-(4-dimethylaminostyryl)-N-ethylpyridinium iodide) has been used for the rapid visualization of several distinct classes of epidermal cells in vivo and in vitro: epidermal electroreceptors, mechanoreceptors, and chloride cells in teleosts, and mechanoreceptors in amphibians. I used DASPEI in an attempt to locate a different type of sensor...

Diel activity patterns are often fixed within species such that most animals can be classified as diurnal, crepuscular, or nocturnal, and have sensory abilities that reflect when they are active. However, many snake species appear capable of switching between diurnal and nocturnal activity. Here, we evaluate the hypothesis that some species are constrained in their activity by the sensory cues ...

Animals inhabiting non-tropical environments undergo seasonal changes in reproduction in order to improve their survival and chances of successful reproduction. For example, during certain periods of the year, food shortages and temperature extremes can make survival difficult. Adaptive physiological, behavioral and morphological changes are made to maintain a positive energy balance throughout...

Una de las dificultades más evidentes en los espacios educativos es la comprensión lectora y estrategias metodológicas involucradas el proceso, ya que afectan directamente al rendimiento académico estudiantes dejándolos desprovistos una actividades sociales mantiene ser humano inmerso cultura, sociedad medio se desenvuelve vive. La presente investigación, definida a partir un enfoque cualitativ...