Ecological patterns, distribution and population structure of Prionace glauca (Chondrichthyes: Carcharhinidae) in the tropical-subtropical transition zone of the north-eastern Pacific

Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth

“…Immature individuals could have fed on offshore cephalopods, which have been previously reported as part of their diet, and have δ 13 C values similar (−16.2 ± 0.3‰) to those found in sharks caught in this region (−16.0 ± 0.7‰). Some studies have reported that blue sharks spend half the year offshore, where some aggregations of immature males have been detected, which helps to support the possibility that immature sharks increase their travel time in searching these prey.…”

Cephalopod species in the diet of large pelagic fish (sharks and billfishes) in Ecuadorian waters

“…Cephalopods as a group are abundant in the water column and it is not surprising that they are consumed by top predators, shown in this study. Each shark and billfish species has a different vertical distribution, the habitat of the species of the G Model genus Sphyrna ranges from close to the water surface and extends down to a depth of 900 m (Bassuno et al, 2011;Hoffmayer et al, 2013), Alopias reaches a depth less than 500 m (Weng and Block, 2004;Cartamil et al, 2011) and P. glauca is found as deep as 1000 m (Vögler et al, 2012). As a result of these predatorís vertical distribution, there is exploitation of a wide range of cephalopod prey as shown in this study.…”

“…P. glauca is an effective predator of squids and its feeding habits characterized by the consumption of deeper water squid species such as A. leuseuri, Gonatus sp. among others, is a consequence of the vertical movements to waters deeper than 1000 m depth (Vögler et al, 2012). The presence of D. gigas in the diet of Alopias spp.…”

Distribution and feeding habitat characterization of whale sharks Rhincodon typus in a protected area in the north Caribbean Sea

“…Data collected in the Afuera zone were excluded from the GAM since they were only available for 2009. The use of the GAM has proved to be an effective method for analysing complex relationships between environmental variables and species distribution in a non-parametric way (Friedlaender et al, 2006;Loots et al, 2007;Becker et al, 2010;Vögler et al, 2012).…”