Visual and passive acoustic observations of blue whale trios from two distinct populations

Blue whale populations from both hemispheres are thought to undertake annual migrations between high latitude feeding grounds and low latitude breeding grounds (Mackintosh, 1966). For individuals of some populations these predetermined movements to and from wintering areas where calving occurs have been confirmed through photo-identification, satellite-tracking, and passive acoustic monitoring (Burtenshaw et al., 2004; Mate, Lagerquist, &...