Seasonal Occurrence of Sympatric Blue Whale Subspecies: the Chilean and Southeast Indian Ocean Pygmy Blue Whales With the Antarctic Blue Whale

There are multiple blue whale acoustic populations found across the Southern Hemisphere. The different subspecies of whales feed in separate areas, but during their migration to lower-latitude breeding areas each year, Antarctic become sympatric with pygmy and Chilean whales. Few studies have compared degree this overlap Hemisphere ocean basins migration. Using up 16 years data, study compares broad seasonal presence whales, Southeast Indian Ocean (SEIO) Pacific Oceans. were other two migrating season every year. Despite overlap, detections peaked earlier austral autumn (April–May) while later winter (June). (Pacific Ocean) SEIO (Indian showed similar patterns despite occurring basins. Though we shown that potential encounter season, these distinct groups remained acoustically stable through time. Further understanding where migrate will enable a better insight as how continue remain separate.