WINTER FEEDING INTENSITY OF NARWHALS (MONODON MONOCEROS)

@article{Laidre2005WINTERFI,
  title={WINTER FEEDING INTENSITY OF NARWHALS (MONODON MONOCEROS)},
  author={Kristin L. Laidre and Mads Peter Heide-J{\o}rgensen},
  journal={Marine Mammal Science},
  year={2005},
  volume={21},
  pages={45-57}
}
Stomach contents from 121 narwhals (Monondon monoceros) harvested in the eastern Canadian High Arctic and West Greenland were used to quantify seasonal changes in feeding activity and prey selection. Stomachs collected from summer harvests were mostly empty with little evidence of recent feeding. Stomachs collected in late fall and winter harvests had considerable amounts of undigested material with evidence of recent feeding. In summer, Arctic cod (Arctogadus glacialis), polar cod (Boreogadus… 

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References

SHOWING 1-10 OF 47 REFERENCES
Summer diet of the narwhal (Monodon monoceros) in Pond Inlet, northern Baffin Island
TLDR
Deepwater fish (halibut, redfish (Sebastes marinus), and polar cod (Arctogadus glacialis), found primarily in male narwhals, indicate a deep diving (>500 m) capability.
The Narwhal, Monodon monoceros, in Eastern Canadian Waters
TLDR
In the Pond Inlet area of Baffin Island in 1963–65, 62 narwhals were caught in nets and examined, and the few identifiable food remains in stomachs were of squid and Arctic cod.
Deep-ocean predation by a high Arctic cetacean
TLDR
The difference in Greenland halibut biomass between an area with high predation and a comparable area without whales, approximately 19 000 tonnes, corresponded well with the predicted biomass removed by the narwhal sub-population on a diet of 50-75% Greenland Halibut.
Stomach contents of northern bottlenose whales Hyperoodon ampullatus stranded in the North Sea
TLDR
Cephalopods in general, and G. fabricii in particular, are the main prey of the northern bottlenose whale and other toothed whales in northern latitudes.
Diets of Baird’s Beaked Whales, Berardius bairdii , in the Southern Sea Of Okhotsk and Off the Pacific Coast Of Honshu, Japan
TLDR
Stomach contents were analyzed from 127 Baird’s beaked whales taken in coastal waters of Japan and the southern Sea of Okhotsk and revealed the whales fed primarily on deep-water gadiform fishes and cephalopods in both regions.
Segregation of migration by feeding ground origin in North Atlantic humpback whales (Megaptera novaeangliae)
TLDR
Results from a large-scale, capture–recapture study of humpback whales Megaptera novaeangliae in the North Atlantic show that migration timing is influenced by feeding ground origin and there is evidence for sexual segregation in migration.
Review of Data on Diets of Beaked Whales: Evidence of Niche Separation and Geographic Segregation
TLDR
Stomach samples of three beaked whale genera primarily contained cephalopod and fish remains, although some also contained crustaceans, which suggests that Mesoplodon occupies a separate dietary niche from Hyperoodon and Ziphius, which may be an example of niche segregation.
The Boreoatlantic gonate squid Gonatus fabricii : distribution and size off West Greenland in summer 1989 and in summer and autumn 1990
TLDR
Examination of squid collections sampled with small pelagic nets in summer 1989 and in summer and autumn 1990 off Southwest Greenland suggested growth rates for juvenile G. fabricii off West Greenland of 4 to 5.5 mm per month between July and November 1990.
DIFFERENCES IN NICHE BREADTH AMONG SOME TEUTHIVOROUS MESOPELAGIC MARINE MAMMALS
TLDR
Here, it is asked whether the mammalian mesopelagic cephalopod predators (which have sufficient diet information available) differ in their niche breadth, and if so, why might this be.
Deep-diving by narwhals Monodon monoceros: differences in foraging behavior between wintering areas?
Variation in resource selection among sub-populations may elucidate differences in fit- ness and life history strategies. Specifically for top marine predators, differences in movements and behavior
...
1
2
3
4
5
...