A fin whale tagged off the northern coast of Chile traveled more than three thousand kilometers through Cape Horn into the Atlantic Ocean, reaching the protected marine area of Namuncurá-Banco Burdwood off the coast of Argentina in just 18 days — and that in the middle of the southern winter.
Usually these giants, second in size only to blue whales, follow predictable seasonal cycles: feeding in cool waters in summer and migrating to warmer latitudes for breeding in winter. However, a satellite transmitter deployed in Caleta Chañaral de Aceituno recorded a completely different scenario: a direct crossing through the dangerous strait, a month-long stay in the food-rich Argentine waters, and a return to the starting point by December.
The study, published in Scientific Reports, shows that the whale spent a month and a half in the protected area, where it apparently fed actively. The signal disappeared in October, but the device started working again exactly at the starting point — a complete round-trip route confirmed. Such data challenge established notions about the strict seasonality of the species' behavior.
Such inter-oceanic movements highlight how closely connected the ecosystems of the Pacific and Atlantic Oceans are at the southern tip of South America. Protected areas like Namuncurá-Banco Burdwood become not just local refuges but key nodes in a network on which the survival of migratory populations depends.
Imagine the vast ocean as a single network of roads, where whales are not just passengers but living indicators of the health of the entire system: their unexpected routes remind us that nature does not always follow our maps and calendars.
Observations of such animals help us better understand how climate change and human activities affect marine corridors, and why international cooperation in the protection of waters is becoming increasingly necessary.
