An ecological threshold, defined as the point at which there is an abrupt change in a quality, property or phenomenon or where small changes in a driver (i.e. wind, light, water masses properties) may produce large responses in the ecosystem.…

In the Gulf of California artisanal shark fishery detailed historical records by species are not available, therefore, is difficult to evaluate the species and achieve adequate management strategies for this region. In recent years, methods to evaluate the fish populations…