Presence of Southeast Pacific blue whales ( Balaenoptera musculus ) off South Georgia in the South Atlantic Ocean Article - Juin 2022

Constanza Rojas‐cerda, Susannah J Buchan, Trevor A Branch, Franck Malige, Julie Patris, Rodrigo Hucke‐gaete, Iain Staniland

Constanza Rojas‐cerda, Susannah J Buchan, Trevor A Branch, Franck Malige, Julie Patris, Rodrigo Hucke‐gaete, Iain Staniland, « Presence of Southeast Pacific blue whales ( Balaenoptera musculus ) off South Georgia in the South Atlantic Ocean  », Marine Mammal Science, juin 2022, pp. 1425 - 1441. ISSN 0824-0469

Abstract

The Southeast Pacific (SEP) or Chilean blue whale population is largely distributed between Northern Chilean Patagonia and the Eastern Tropical Pacific. Off South Georgia (SG), the majority of blue whales caught were Antarctic blue whales, but recent genetic and acoustic records indicate the possible presence of SEP individuals. To assess the presence of SEP blue whales off SG, we carried out new analyses of acoustic data previously reported as containing pygmy blue whale song and analyzed the length frequencies from 20th century catch data. The month of acoustic data reported to contain the presumed pygmy blue whale song was examined (August 2006), and 13 days were found to have songs which visually and quantitatively matched SEP2 songs from Northern Chilean Patagonia. The fundamental frequency of SEP2 song off SG, however, was not in line with the

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