Observations of Humpback Whales, Megaptera novaeangliae, in the Beaufort Sea, Alaska

Hashagen, Kenneth A.; Green, Gregory A.; Adams, Billy

doi:10.1898/nwn08-40.1

Cited by 4 publications

(3 citation statements)

References 53 publications

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“…) and humpback whales have been sighted in the Arctic Ocean, an area not previously known as humpback habitat (Hashagen et al . ). Fin whales are also recovering and have exhibited population growth at annual rates of 4.8%, but fin whales are failing to return to some of their historical habitats (Zerbini et al .…”

Section: Discussionmentioning

confidence: 97%

Using dive behavior and active acoustics to assess prey use and partitioning by fin and humpback whales near Kodiak Island, Alaska

Witteveen

Robertis

Guo

et al. 2014

Marine Mammal Science

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Near the Kodiak Archipelago, fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales frequently overlap spatially and temporally. The Gulf Apex Predator-prey study (GAP) investigated the prey use and potential prey partitioning between these sympatric species by combining concurrent analysis of vertical whale distribution with acoustic assessment of pelagic prey. Acoustic backscatter was classified as consistent with either fish or zooplankton. Whale dive depths were determined through suction cup tags. Tagged humpback whales (n = 10) were most often associated with distribution of fish, except when zooplankton density was very high. Associations between the dive depths of tagged fin whales (n = 4) and the vertical distribution of either prey type were less conclusive. However, prey assessment methods did not adequately describe the distribution of copepods, a potentially significant resource for fin whales. Mean dive parameters showed no significant difference between species when compared across all surveys. However, fin whales spent a greater proportion of dive time in the foraging phase than humpbacks, suggesting a possible difference in foraging efficiency between the two. These results suggest that humpback and fin whales may target different prey, with the greatest potential for diet overlap occurring when the density of zooplankton is very high.

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Section: Discussionmentioning

confidence: 97%

Using dive behavior and active acoustics to assess prey use and partitioning by fin and humpback whales near Kodiak Island, Alaska

Witteveen

Robertis

Guo

et al. 2014

Marine Mammal Science

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“…Prior to this report, only two humpback whale sightings had been documented near Pt. Barrow or in the Beaufort Sea in the literature (Hashagen et al, 2009; Shelden et al, 2017). The earliest sightings of which we are aware are from 2007 (Table 1).…”

Section: Figurementioning

confidence: 99%

Humpback whale sightings in northern Arctic Alaska

Stafford

George²,

Harcharek³

et al. 2023

Marine Mammal Science

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“…Humpback whales winter in subtropical and tropical waters, and most migrate seasonally to higher latitudes to feed on euphausiids and small schooling fishes (Clapham, 2002 whales likely represent more than one stock (Ohsumi and Masaki, 1975;Allen and Angliss, 2012 (Hashagen et al, 2009;Haley et al, 2010;Aerts et al, 2013a;.…”

Section: Recent and Historical Subarctic Cetacean Records Humpback Whmentioning

confidence: 99%

Subarctic Cetaceans in the Southern Chukchi Sea: Evidence of Recovery or Response to a Changing Ecosystem

Clarke¹,

Stafford²,

Moore³

et al. 2013

oceanog

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Observations of Humpback Whales, Megaptera novaeangliae, in the Beaufort Sea, Alaska

Cited by 4 publications

References 53 publications

Using dive behavior and active acoustics to assess prey use and partitioning by fin and humpback whales near Kodiak Island, Alaska

Using dive behavior and active acoustics to assess prey use and partitioning by fin and humpback whales near Kodiak Island, Alaska

Humpback whale sightings in northern Arctic Alaska

Subarctic Cetaceans in the Southern Chukchi Sea: Evidence of Recovery or Response to a Changing Ecosystem

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