Our aim was to examine the foraging behavior of northern elephant seals Mirounga angustirostris during the 1997–98 El Niño and compare it to foraging in others years. Given their deep diving and spatial distribution, their immediate response to a seve . . .

Data-recording tags applied to marine animals store data for later retrieval and can return valuable information on animal behavior and ecology, including habitat preference, physiology, and movement patterns, as well as environmental data. If properl . . .

Marine mammals are a conspicuous faunal element of the Southern Ocean ecosystem and have evolved specialized life history patterns to live there. Six species of pinnipeds inhabit the Southern Ocean, including five species of true seals (family Phocida . . .

The miniaturization of electronic components and sensors has improved technology for ocean and atmospheric sampling as well as in other related fields. Small, electronic tags, for example, have enabled research on the behavior and movements of oceanic . . .

We test the hypothesis that the New Zealand sea lion is physiologically better equipped for prolonged, continuous diving than other otariids (fur seals and sea lions) by measuring its blood volume, an important component of its oxygen storage. Mass, h . . .

Free-ranging animals often cope with fluctuating environmental conditions such as weather, food availability, predation risk, the requirements of breeding, and the influence of anthropogenic factors. Consequently, researchers are increasingly measurin . . .

The mesopelagic zone of the northeast Pacific Ocean is an important foraging habitat for many predators, yet few studies have addressed the factors driving basin-scale predator distributions or inter-annual variability in foraging and breeding success . . .

In marine ecosystems, physical and biological processes act at multiple temporal and spatial scales to influence the distribution of prey species and subsequently habitat selection of foraging apex predators. Understanding how apex predators may respo . . .

Many diving animals undergo substantial changes in their body density that are the result of changes in lipid content over their annual fasting cycle. Because the size of the lipid stores reflects an integration of foraging effort (energy expenditure) . . .