New Extralimital Record of a Narwhal (Monodon monoceros) in Europe
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چکیده
منابع مشابه
Extreme physiological adaptations as predictors of climatechange sensitivity in the narwhal, Monodon monoceros
Rapid changes in sea ice cover associated with global warming are poised to have marked impacts on polarmarinemammals.Here we examine skeletalmuscle characteristics supporting swimming and diving in one polar species, the narwhal, and use these attributes to further document this cetacean’s vulnerability to unpredictable sea ice conditions and changing ecosystems. We found that extreme morpholo...
متن کاملAspartic acid racemization rate in narwhal (Monodon monoceros) eye lens nuclei estimated by counting of growth layers in tusks
Aspartic acid racemization rate in narwhal (Monodon monoceros) eye lens nuclei estimated by counting of growth layers in tusks Eva Garde, Mads Peter Heide-Jørgensen, Susanne Ditlevsen & Steen H. Hansen 1 Center for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5 7, DK-1350 Copenhagen Ø, Denmark 2 Greenland Institute of Natural Resources, PO Box 570, DK...
متن کاملWinter Feeding Intensity of Narwhals (monodon Monoceros)
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...
متن کاملParadoxical escape responses by narwhals (Monodon monoceros).
Until recent declines in Arctic sea ice levels, narwhals (Monodon monoceros) have lived in relative isolation from human perturbation and sustained predation pressures. The resulting naïvety has made this cryptic, deep-diving cetacean highly susceptible to disturbance, although quantifiable effects have been lacking. We deployed a submersible, animal-borne electrocardiograph-accelerometer-depth...
متن کاملHighly Directional Sonar Beam of Narwhals (Monodon monoceros) Measured with a Vertical 16 Hydrophone Array
Recordings of narwhal (Monodon monoceros) echolocation signals were made using a linear 16 hydrophone array in the pack ice of Baffin Bay, West Greenland in 2013 at eleven sites. An average -3 dB beam width of 5.0° makes the narwhal click the most directional biosonar signal reported for any species to date. The beam shows a dorsal-ventral asymmetry with a narrower beam above the beam axis. Thi...
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ژورنال
عنوان ژورنال: Aquatic Mammals
سال: 2018
ISSN: 0167-5427
DOI: 10.1578/am.44.1.2018.39