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We used Argos satellite transmitters to monitor the movement and oceanographic habitats\udused by rockhopper penguins Eudyptes chrysocome chrysocome during their winter dispersal\udfrom Staten Island, Argentina, for 2002 (n = 10) and 2003 (n = 15). In both years penguins concentrated\udtheir activities to shallow and highly productive waters with temperatures ranging from 5 to\ud8°C. However, analysis of migration patterns, in conjunction with remotely-sensed sea surface temperature\ud(SST) and chlorophyll a (chl a) concentration data, showed that habitat use and movement\udwere substantially different for the 2 years. Both years were characterised by different oceanographic\udconditions; comparison of SST revealed colder temperatures in 2002 than the long-term average,\udwhile temperatures in 2003 were not significantly different from average conditions. The movement\udof rockhopper penguins differed between years: penguins migrated to the same general locations but\udused a larger number of foraging areas in 2002. They also spent less time travelling than in 2003.\udMoreover, we also found differences in adult survival or return rate and breeding success between\udyears. Consequently, we conclude that during colder winters with more heterogeneous oceanographic\udconditions (e.g. 2002), penguins are better able to find enough food to achieve body condition for the following breeding season

Effect of oceanographic conditions on the winter movements of rockhopper penguins Eudyptes chrysocome chrysocome from Staten Island, Argentina