In many fish and reptiles, gastric digestion is responsible for the complete breakdown of prey items into semi-liquid chyme. The responses of the stomach to feeding and to periods of fasting are, however, unknown for many lower vertebrates. We inserted data loggers into the stomachs of free-swimming captive adult blacktip reef sharks (Carcharhinus melanopterus) to quantify gastric pH, motility ...

THIS REPORT concerns a study of the feeding behavior in three species of sharks: Carcharhinus menisorrah Miiller and Henle, the grey shark (Fig. 1), Carcharhinus melanopterus Quoyand Gaimard, the blacktip shark (Fig. 2), both of the family Carcharhinidae; and Triaenodon obesus Riippell, the whitetip shark (Fig. 3), of the family Triakidae. The study was conducted in the lagoon at Eniwetok Atoll...

La distribución reproductiva de la Guayata O. melanopterus, comprende áreas cordilleranas desde Perú hasta Argentina y Chile, localizadas a altitudes más 3000 msnm. Durante época no una parte su población migra hacia regiones bajas (de menos 2000 msnm), al en sur distribución. En estatus conservación se ha establecido categoría vulnerable por el aumento las interacciones con actividades humanas...

Abstract Genetic relatedness in animal societies is often a factor that drives the structure of social groups. In marine world, most studies which have investigated this question focused on mammals such as whales and dolphins. For sharks, recent demonstrated preferential associations among individuals from communities emerge. Assortment patterns been found according to phenotypic or behavioral ...