Cryptic vocal behavior of foraging humpback whales on feeding grounds in West Greenland.

Male humpback whales (Megaptera novaeangliae) sing in mating aggregations in the form of song displays, but much less is known about how both sexes use sound on their feeding grounds. Here, we test different hypotheses about the function of vocalizations in 14 foraging humpback whales tagged with sound and movement recording Dtags in Greenland. We show that this population of foraging humpback whales have an overall low call rate of 11.9 calls h-1 (inter-quartile range = 12.1) with no support for the hypotheses that they employ sound in the localization or manipulation of prey nor in the coordination of lunge feeding. The calls had a mean received level of 135 ± 5dB re 1 μPa, which is some 30 dB lower than maximum levels of song recorded on similar deployed tags, suggesting a much smaller active space of these vocalizations. This reduced active space might, in concert with low call rates, serve to mitigate eavesdropping by predatory killer whales or conspecifics competing for the same prey resources. We conclude that feeding humpback whales in Greenland produce low level, infrequent calls suggesting that calling is not a prerequisite for successful feeding, but likely serves to mediate within group social interactions.

[1]  K. Laidre,et al.  Estimates of large whale abundance in Greenlandic waters from a ship-based survey in 2005 , 2023, J. Cetacean Res. Manage..

[2]  K. Laidre,et al.  Autumn space-use patterns of humpback whales (Megaptera novaeangliae) in West Greenland , 2023, J. Cetacean Res. Manage..

[3]  William T. Gough,et al.  Modelling short‐term energetic costs of sonar disturbance to cetaceans using high‐resolution foraging data , 2021, Journal of Applied Ecology.

[4]  Tyler A. Helble,et al.  The Lombard effect in singing humpback whales: Source levels increase as ambient ocean noise levels increase. , 2020, The Journal of the Acoustical Society of America.

[5]  Dana A. Cusano,et al.  Acoustic crypsis in communication by North Atlantic right whale mother–calf pairs on the calving grounds , 2019, Biology Letters.

[6]  P. Madsen,et al.  Acoustic crypsis in southern right whale mother–calf pairs: infrequent, low-output calls to avoid predation? , 2019, Journal of Experimental Biology.

[7]  J. Straley,et al.  Feeding calls produced by solitary humpback whales , 2018 .

[8]  R. Constantine,et al.  Night-life of Bryde’s whales: ecological implications of resting in a baleen whale , 2018, Behavioral Ecology and Sociobiology.

[9]  D. Mellinger,et al.  Source levels of foraging humpback whale calls. , 2018, The Journal of the Acoustical Society of America.

[10]  L. Torres.  A sense of scale: Foraging cetaceans' use of scale‐dependent multimodal sensory systems , 2017 .

[11]  Mark P. Johnson,et al.  High suckling rates and acoustic crypsis of humpback whale neonates maximise potential for mother–calf energy transfer , 2017 .

[12]  L. Herman.  The multiple functions of male song within the humpback whale (Megaptera novaeangliae) mating system: review, evaluation, and synthesis , 2017, Biological reviews of the Cambridge Philosophical Society.

[13]  Antoine M. Dujon,et al.  Noninvasive unmanned aerial vehicle provides estimates of the energetic cost of reproduction in humpback whales , 2016 .

[14]  J. Teilmann,et al.  Ultra-High Foraging Rates of Harbor Porpoises Make Them Vulnerable to Anthropogenic Disturbance , 2016, Current Biology.

[15]  R. Dunlop.  Changes in vocal parameters with social context in humpback whales: considering the effect of bystanders , 2016, Behavioral Ecology and Sociobiology.

[16]  Ellen C. Garland,et al.  Non-song social call bouts of migrating humpback whales. , 2015, The Journal of the Acoustical Society of America.

[17]  P. Miller,et al.  Predator sound playbacks reveal strong avoidance responses in a fight strategist baleen whale , 2015 .

[18]  David K Mellinger,et al.  Repertoire and classification of non-song calls in Southeast Alaskan humpback whales (Megaptera novaeangliae). , 2015, The Journal of the Acoustical Society of America.

[19]  Susan E. Parks,et al.  Evidence for acoustic communication among bottom foraging humpback whales , 2014, Scientific Reports.

[20]  D. Cato,et al.  Evidence of a Lombard response in migrating humpback whales (Megaptera novaeangliae). , 2014, The Journal of the Acoustical Society of America.

[21]  D. Bates,et al.  Fitting Linear Mixed-Effects Models Using lme4 , 2014, 1406.5823.

[22]  C. Ware,et al.  Bottom side‐roll feeding by humpback whales (Megaptera novaeangliae) in the southern Gulf of Maine, U.S.A , 2014 .

[23]  R. B. Tyson,et al.  Extreme diel variation in the feeding behavior of humpback whales along the western Antarctic Peninsula during autumn , 2013 .

[24]  P. Stevick,et al.  Differential rates of killer whale attacks on humpback whales in the North Atlantic as determined by scarification , 2013, Journal of the Marine Biological Association of the United Kingdom.

[25]  Douglas H Cato,et al.  Source levels of social sounds in migrating humpback whales (Megaptera novaeangliae). , 2013, The Journal of the Acoustical Society of America.

[26]  W. Hoppitt,et al.  Network-Based Diffusion Analysis Reveals Cultural Transmission of Lobtail Feeding in Humpback Whales , 2013, Science.

[27]  D. Lusseau,et al.  Minke whales maximise energy storage on their feeding grounds , 2013, Journal of Experimental Biology.

[28]  A. Stimpert,et al.  Humpback Whale Song and Foraging Behavior on an Antarctic Feeding Ground , 2012, PloS one.

[29]  Peter T. Madsen,et al.  Keeping momentum with a mouthful of water: behavior and kinematics of humpback whale lunge feeding , 2012, Journal of Experimental Biology.

[30]  Elia Y. K. Herman,et al.  Resightings of humpback whales in Hawaiian waters over spans of 10–32 years: Site fidelity, sex ratios, calving rates, female demographics, and the dynamics of social and behavioral roles of individuals , 2011 .

[31]  Colin Ware,et al.  Shallow and deep lunge feeding of humpback whales in fjords of the West Antarctic Peninsula , 2011 .

[32]  Whitlow W L Au,et al.  Common humpback whale (Megaptera novaeangliae) sound types for passive acoustic monitoring. , 2011, The Journal of the Acoustical Society of America.

[33]  P. Madsen,et al.  Habitat use of humpback whales in Godthaabsfjord, West Greenland, with implications for commercial exploitation , 2010, Journal of the Marine Biological Association of the United Kingdom.

[34]  Stephen M. Dawson,et al.  Clicks and Communication: The Behavioural and Social Contexts of Hector's Dolphin Vocalizations , 2010 .

[35]  P. Heagerty,et al.  Spatial associations between large baleen whales and their prey in West Greenland , 2010 .

[36]  Mark P. Johnson,et al.  Studying the behaviour and sensory ecology of marine mammals using acoustic recording tags: a review , 2009 .

[37]  John Calambokidis,et al.  Foraging behavior of humpback whales: kinematic and respiratory patterns suggest a high cost for a lunge , 2008, Journal of Experimental Biology.

[38]  D. Cato,et al.  The social vocalization repertoire of east Australian migrating humpback whales (Megaptera novaeangliae). , 2007, The Journal of the Acoustical Society of America.

[39]  Roland Arsenault,et al.  ‘Megapclicks’: acoustic click trains and buzzes produced during night-time foraging of humpback whales (Megaptera novaeangliae) , 2007, Biology Letters.

[40]  J. Calambokidis,et al.  Southern Hemisphere humpback whales wintering off Central America: insights from water temperature into the longest mammalian migration , 2007, Biology Letters.

[41]  Marc O Lammers,et al.  Acoustic properties of humpback whale songs. , 2006, The Journal of the Acoustical Society of America.

[42]  John Calambokidis,et al.  Kinematics of foraging dives and lunge-feeding in fin whales , 2006, Journal of Experimental Biology.

[43]  L. Miller,et al.  ICELANDIC KILLER WHALES ORCINUS ORCA USE A PULSED CALL SUITABLE FOR MANIPULATING THE SCHOOLING BEHAVIOUR OF HERRING CLUPEA HARENGUS , 2006 .

[44]  C. Clark,et al.  Acoustic monitoring on a humpback whale (Megaptera novaeangliae) feeding ground shows continual singing into late spring , 2004, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[45]  Peter L. Tyack,et al.  A digital acoustic recording tag for measuring the response of wild marine mammals to sound , 2003 .

[46]  Salvatore Cerchio,et al.  VARIATION IN FEEDING VOCALIZATIONS OF HUMPBACK WHALES MEGAPTERA NOVAEANGLIAE FROM SOUTHEAST ALASKA , 2001 .

[47]  D. Cato,et al.  Cultural revolution in whale songs , 2000, Nature.

[48]  P. Clapham.  The social and reproductive biology of Humpback Whales: an ecological perspective , 1996 .

[49]  M. Weinrich,et al.  Evidence for acquisition of a novel feeding behaviour: lobtail feeding in humpback whales, Megaptera novaeangliae , 1992, Animal Behaviour.

[50]  M. Weinrich,et al.  Short-term association patterns of humpback whale (Megaptera novaeangliae) groups on their feeding grounds in the southern Gulf of Maine , 1991 .

[51]  Gregory K. Silber,et al.  The relationship of social vocalizations to surface behavior and aggression in the Hawaiian humpback whale (Megaptera novaeangliae) , 1986 .

[52]  P. O. Thompson,et al.  Sounds, source levels, and associated behavior of humpback whales, southeast Alaska. , 1986, The Journal of the Acoustical Society of America.

[53]  P. Tyack,et al.  Interactions between singing Hawaiian humpback whales and conspecifics nearby , 1981, Behavioral Ecology and Sociobiology.

[54]  H. E. Winn,et al.  The song of the humpback whale Megaptera novaeangliae in the West Indies , 1978 .

[55]  R. Payne,et al.  Songs of Humpback Whales , 1971, Science.

[56]  M. Biuw,et al.  Indication that the behavioural responses of humpback whales to killer whale sounds are influenced by trophic relationships , 2020 .

[57]  CYNTHIA G. D'VINCENT,et al.  VOCALIZATION AND COORDINATED FEEDING BEHAVIOR OF THE HUMPBACK WHALE IN SOUTHEASTERN ALASKA , 2017 .

[58]  C. Ware,et al.  Underwater components of humpback whale bubble-net feeding behaviour , 2011 .

[59]  R. Reeves,et al.  Fight or flight: antipredator strategies of baleen whales , 2008 .

[60]  Steven L. Swartz,et al.  The Humpback Whale , 1989 .