Tracking fitness in marine vertebrates

A special theme section was published this week in Marine Ecology Progress Series, “Tracking fitness in marine vertebrates“, covering a wide range of studies, from fish to seabirds, that use tag technology in combination with other disciplines to resolve the mechanisms underlying individual fitness (survival, timing of reproduction, foraging success). Here is a look inside the field camp from one of the studies included in the theme section that focused on studying heart rate in emperor penguins diving at sea: penguins-invade-camp .