scholarly journals Stomach temperature of narwhals (Monodon monoceros) during feeding events

2014 ◽  
Vol 2 (1) ◽  
pp. 9 ◽  
Author(s):  
Mads Heide-Jørgensen ◽  
Nynne H Nielsen ◽  
Rikke G Hansen ◽  
Susanna B Blackwell
Keyword(s):  
Stomach Temperature ◽  
Monodon Monoceros

The migratory behaviour of narwhals (Monodon monoceros)

2003 ◽  
Vol 81 (8) ◽  
pp. 1298-1305 ◽  
Author(s):  
Mads Peter Heide-Jørgensen ◽  
Rune Dietz ◽  
Kristin L Laidre ◽  
Pierre Richard ◽  
Jack Orr ◽  
...  
Keyword(s):  
Open Water ◽  
High Arctic ◽  
Early Summer ◽  
Canadian High Arctic ◽  
Baffin Bay ◽  
Bay Area ◽  
Monodon Monoceros ◽  
Migratory Routes ◽  
Somerset Island ◽  
Wintering Ground

Sixteen female narwhals (Monodon monoceros) were tracked by satellite in 2000 and 2001 from their summering ground near Somerset Island in the Canadian High Arctic to their wintering ground in central Baffin Bay. The wintering ground location was spatially discrete from another narwhal wintering ground in southern Baffin Bay. Area extent of the summering ground was approximately 9464 km2 and area extent of the wintering ground was 25 846 km2. Two of the narwhals were tracked for more than 12 consecutive months. These whales used three focal areas between their spring and autumn migration: a coastal area in the open-water season in August in the Canadian High Arctic, a wintering area from November through April in the consolidated pack ice of Baffin Bay, and an early summer area in front of the receding fast ice edge in Lancaster Sound. The whales showed remarkable site fidelity to summering grounds and had specific migratory routes that followed sea ice formation and recession.

2. Some Observations on the Dentition of the Narwhal (Monodon monoceros)

1872 ◽  
Vol 7 ◽  
pp. 759-760 ◽  
Author(s):  
Turner
Keyword(s):  
Young Male ◽  
Monodon Monoceros ◽  
Upper Jaw

The author expressed his concurrence with those anatomists who hold that the two tusks of the narwhal are situated in sockets in the superior maxillary bones, and not, as was stated by the Cuviers, in the premaxillæ, or partly in the pre- and partly in the superior maxillæ. He then proceeded to relate some further observations on the dentition of the narwhal, and pointed out, both in the skull of a young male and in those of three well grown fœtuses, an elongated canal on each side of the upper jaw, parallel and inferior to the tusk socket, which had the appearance of a socket for a supplementary tooth, although none protruded from it. In the young male a minute denticle was seen at the bottom of this socket.

The tuskal pulp of the narwhal, Monodon monoceros

1977 ◽  
Vol 44 (1) ◽  
pp. 135-146 ◽  
Author(s):  
P.R. Dow ◽  
M.J. Hollenberg
Keyword(s):  
Monodon Monoceros

scholarly journals Differences in triacylglycerols from acoustic tissues and posterior cranial blubber of the narwhal (Monodon monoceros)

1972 ◽  
Vol 130 (1) ◽  
pp. 33P-34P ◽  
Author(s):  
P A Robisch ◽  
D C Malins ◽  
R Best ◽  
U Varanasi
Keyword(s):  
Monodon Monoceros

scholarly journals Use of glacial fronts by narwhals ( Monodon monoceros ) in West Greenland

2016 ◽  
Vol 12 (10) ◽  
pp. 20160457 ◽  
Author(s):  
Kristin L. Laidre ◽  
Twila Moon ◽  
Donna D. W. Hauser ◽  
Richard McGovern ◽  
Mads Peter Heide-Jørgensen ◽  
...  
Keyword(s):  
Negative Relationship ◽  
Sediment Flux ◽  
West Greenland ◽  
Front Width ◽  
Monodon Monoceros ◽  
Run Off ◽  
Glacier Ice ◽  
Fast Ice ◽  
Front Advance ◽  
Glacier Velocity

Glacial fronts are important summer habitat for narwhals ( Monodon monoceros ); however, no studies have quantified which glacial properties attract whales. We investigated the importance of glacial habitats using telemetry data from n = 15 whales tagged in September of 1993, 1994, 2006 and 2007 in Melville Bay, West Greenland. For 41 marine-terminating glaciers, we estimated (i) narwhal presence/absence, (ii) number of 24 h periods spent at glaciers and (iii) the fraction of narwhals that visited each glacier (at 5, 7 and 10 km) in autumn. We also compiled data on glacier width, ice thickness, ice velocity, front advance/retreat, area and extent of iceberg discharge, bathymetry, subglacial freshwater run-off and sediment flux. Narwhal use of glacial habitats expanded in the 2000s probably due to reduced summer fast ice and later autumn freeze-up. Using a generalized multivariate framework, glacier ice front thickness (vertical height in the water column) was a significant covariate in all models. A negative relationship with glacier velocity was included in several models and glacier front width was a significant predictor in the 2000s. Results suggest narwhals prefer glaciers with potential for higher ambient freshwater melt over glaciers with silt-laden discharge. This may represent a preference for summer freshwater habitat, similar to other Arctic monodontids.

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