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Ocean basin-wide movement patterns of North Atlantic humpback whales
By Lindsey Jones, Judith Allen, Charla Basran, Simon Berrow, Liliana Betancourt, Laurent Bouveret, Tenna Boye, Fredrik Broms, Valerie Chosson, Phillip Clapham, Thomas Fernald, Jodi Frediani, Beatrice Jann, Reg Kempen, Pedro López Suárez, Edda Magnúsdóttir, David Mattila, Mithriel MacKay, Nils Øien, Marianne Rasmussen, Manolo Rinaldi, Jooke Robbins, Richard Sears, Rosemary Seton, Malene Simon, Omar Shamir Reynoso, Peter Stevick, Sean Todd, Mason Weinrich, Frederick Wenzel, Hal Whitehead, Deborah Young, Kenneth Balcomb, Jon Lien, Gislí Víkingsson
Originally published in Journal of Cetacean Research and Management in February 2025
Abstract
North Atlantic (NA) humpback whales (Megaptera novaeangliae) migrate between high‐latitude maternal feeding grounds and low‐latitude breeding/calving grounds, with one distinct breeding segment currently considered endangered: Cape Verde Islands/northwest Africa (CVI). This study assesses the movement patterns and population spatial structuring of humpback whales across the NA Ocean basin for the first time in three decades. Photo‐ID records from collections contributed to the North Atlantic Humpback Whale Catalogue, a dataset of 38,319 records of 9,977 individuals documented between 1980 and 2015 were analysed. Transition probabilities were estimated between all five primary feeding grounds and three breeding/calving areas defined as CVI, Greater Antilles and Lesser Antilles, dividing the West Indies distinct population segment into two, based on emerging trends. Breeding‐to‐feeding area transition probabilities were highest from the Greater Antilles to western feeding grounds (the Gulf of Maine, Atlantic Canada and West Greenland), from the Lesser Antilles to eastern feeding grounds (Norway and Iceland), and from CVI to eastern feeding grounds. The difference in migratory patterns of humpback whales using the Greater Antilles and Lesser Antilles regions within the West Indies indicates that they are behaviourally distinct and may be best managed as separate breeding populations.
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