Fig 5 - Past and present distribution, densities and movements of blue whales in the Southern Hemisphere and adjacent waters

IDCR/SOWER vessel tracks (lines) and blue whale sightings ( ᭺ ) between 1978 and 2005. Only primary search effort is plotted, but blue whales sighted both on-effort and off-effort are plotted. The intended surveys were generally conducted south of 60°S (dashed line) but additional primary effort was recorded further north during transits to the survey areas. IDCR, International Decade of Cetacean Research; SOWER, Southern Ocean Whale and Ecosystem Research.

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Reference

Past and present distribution, densities and movements of blue whales in the Southern Hemisphere and adjacent waters - Scientific Figure on ResearchGate. Available from: https://www.researchgate.net/figure/DCR-SOWER-vessel-tracks-lines-and-blue-whale-sightings-between-1978-and-2005_fig3_251882581 [accessed 19 Jun 2025]

Caption

Fig. 5. IDCR/SOWER vessel tracks (lines) and blue whale sightings ( ᭺ ) between 1978 and 2005. Only primary search effort is plotted, but blue whales sighted both on-effort and off-effort are plotted. The intended surveys were generally conducted south of 60°S (dashed line) but additional primary effort was recorded further north during transits to the survey areas. IDCR, International Decade of Cetacean Research; SOWER, Southern Ocean Whale and Ecosystem Research.

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<a href="https://www.researchgate.net/figure/DCR-SOWER-vessel-tracks-lines-and-blue-whale-sightings-between-1978-and-2005_fig3_251882581"><img src="https://www.researchgate.net/profile/Kathleen-Stafford-2/publication/251882581/figure/fig3/AS:298234158305292@1448115972887/DCR-SOWER-vessel-tracks-lines-and-blue-whale-sightings-between-1978-and-2005.png" alt="IDCR/SOWER vessel tracks (lines) and blue whale sightings ( ᭺ ) between 1978 and 2005. Only primary search effort is plotted, but blue whales sighted both on-effort and off-effort are plotted. The intended surveys were generally conducted south of 60°S (dashed line) but additional primary effort was recorded further north during transits to the survey areas. IDCR, International Decade of Cetacean Research; SOWER, Southern Ocean Whale and Ecosystem Research."/></a>