Ocean to Ocean: First Documented Migration of a Southern Right Whale From the Southwest Atlantic to the Southeast Pacific Ocean

The authors declare no conflicts of interest. The data that support the findings of this study are available from the corresponding author upon reasonable request. Table S1: Summary of mitochondrial DNA (mtDNA) control region sequences used in this study, including sample identifiers, GenBank accession numbers, geographic origin, and corresponding references. Sequences obtained in the present study and those from García-Cegarra et al. (2024) have not yet been deposited in GenBank. Figure S1: Schematic representation of the historical and current distributions of the Eastern South Pacific (ESP) population of southern right whales. Historical records are based on whaling catch maps (Maury et al. 1853; Townsend 1935) and therefore may not represent the full extent of the species' distribution. Current records are derived from observational effort and stranding response primarily concentrated in coastal areas (Aguayo-Lobo, Acevedo, et al. 2008; Galletti Vernazzani, Brito, et al. 2011; Castro Ayala et al. 2024). Isobaths of 200 and 1000 m are included to demarcate the continental slope. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.