Results 161 to 170 of about 4,290 (197)

Narwhals require targeted conservation

Science, 2020
Narwhals are one of three highly specialized whale species that are endemic to the Arctic ([ 1 ][1]). The global narwhal population may number more than 100,000 individuals, but the species persists as a complex, highly divided meta-population, with limited or no exchange between neighboring subpopulations ([ 1 ][1]).
M P, Heide-Jørgensen, E, Garde, R G, Hansen, O M, Tervo, Mikkel-Holger S, Sinding, L, Witting, M, Marcoux, C, Watt, K M, Kovacs, R R, Reeves   +9 more
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Fractal analysis of narwhal space use patterns

Zoology, 2004
Quantifying animal movement in response to a spatially and temporally heterogeneous environment is critical to understanding the structural and functional landscape influences on population viability. Generalities of landscape structure can easily be extended to the marine environment, as marine predators inhabit a patchy, dynamic system, which ...
Laidre, K. L., Heide-Jørgensen, M. P., Logsdon, M. L., Hobbs, R. C., Dietz, R., VanBlaricom, G. R.   +5 more
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High Intensity Narwhal Clicks

1990
The hypothesis that some odontocetes use their sonar not only to find prey, but also to debilitate it (Norris and Mohl, 1983) requires that odontocetes produce sound pressures in excess of 230 dB re. 1 μPa (Zaegaesky, 1987; Hubbs and Rechnitzer, 1972).
Bertel Møhl, Annemarie Surlykke, Lee A. Miller   +2 more
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Aspartic acid racemization in narwhal teeth

Nature, 1983
Sometimes referred to as sea unicorns, narwhals (Monodon monoceros) are Arctic cetaceans which throughout history have been revered as unique and mystical animals. In pre-nineteenth century societies, the long, up to 2 m in length, counterclockwise spiralling tooth of the male narwhal was thought to be the ‘tusk’ or alicorn of the legendary unicorn1,2.
Jeffrey L. Bada, Edward Mitchell, Brian Kemper   +2 more
openaire   +1 more source

Paradoxical escape responses by narwhals ( Monodon monoceros )

Science, 2017
The flight of the narwhal Animals tend to respond to threats with the well-known behaviors of fight, flee, or freeze, each of which requires a different suite of physiological responses. Marine mammals face particular challenges because they may flee into an environment where oxygen is not available and pressure must be ...
Terrie M. Williams, Susanna B. Blackwell, Beau Richter, Mikkel-Holger S. Sinding, Mads Peter Heide-Jørgensen   +4 more
openaire   +3 more sources

Heterogeneous Narwhal and Paxos

  Blockchain interoperability often requires a mutually trusted layer (in the case of roll-ups or side-chains), or a third party (in the case of bridges). Heterogeneous Consensus protocols introduced the possibility for more direct, decentralized interoperability: chains can commit transactions together, given "enough" overlap in their trust ...
Heindel, Tobias, Karbyshev, Aleksandr, Sheff, Isaac   +2 more
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The flight of the narwhal

Science, 2017
Ecophysiology![Figure][1] An adult male narwhal preparing to dive in Scoresby Sound, Greenland CREDIT: TERRIE M. WILLIAMS Animals tend to respond to threats with the well-known behaviors of fight, flee, or freeze, each of which requires a different suite of physiological responses ...
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Narwhal ( Monodon monoceros )

Ploughshares
Abstract: The Spring 2025 Issue. Ploughshares is an award-winning journal of new writing. Since 1971, Ploughshares has discovered and cultivated the freshest voices in contemporary American literature, and now provides readers with thoughtful and entertaining literature in a variety of formats.
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Computer-Assisted Photo-Identification of Narwhals

ARCTIC, 2011
Although the narwhal (Monodon monoceros) is economically and culturally important to northern residents, sound management of this species is impaired by large gaps in knowledge. Research on this species has been limited partly by the cost of the methods used, and partly because some of these methods are invasive and therefore condemned by Inuit ...
Marie Auger-Méthé, Marianne Marcoux, Hal Whitehead   +2 more
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Chirality, diastereoisomerism, and the Narwhal

Journal of Chemical Education, 1978
There are many simple examples of enantiomeric objects, both natural and man-made and their static interrelationship is directly and tellingly examined with the aid of a mirror.
openaire   +1 more source