In situ measurements, Surface temperature, Instrument platforms, Penguins, Fronts, Bio-logging, FORAGING BEHAVIOR, ENVIRONMENTAL VARIABLES, SOUTHERN-OCEAN, PHALACROCORAX-ATRICEPS, SPHENISCUS-MAGELLANICUS, CONTINENTAL-SHELF, SAN-MATIAS GULF, MARINE & FRESHWATER BIOLOGY, OCEANOGRAPHY, ENGRAULIS-ANCHOITA, REPRODUCTIVE SUCCESS, Global temperature changes, Artifi...