Glacial earthquake-generating iceberg calving in a narwhal summering ground: The loudest underwater sound in the Arctic?

Measurements of underwater sound are still scarce in the rapidly changing Arctic. Tele-seismically detectable glacial earthquakes caused by iceberg calving have been known for nearly two decades but their underwater sound levels remain undocumented. Here, we present near-source underwater sound records from a kilometer-scale iceberg calving associated with a glacial earthquake. >> read more …

‘Sea unicorns’ are especially sensitive to human noise

One of the ocean’s most legendary creatures is also one of the most sensitive to human noise. A new study finds the unicornlike narwhal is affected by ship sounds more than most other whales and dolphins. The noises—which are growing more frequent as ships push further into the narwhal’s Arctic habitat—could disrupt the whales’ hunting … Meer lezen

After thousands of years, an iconic whale confronts a new enemy

For millennia, vast expanses of the Arctic Ocean have been untouched by humans, ocean where narwhals and other marine mammals lived undisturbed. Now that climate change is causing sea ice to melt, there has been an uptick of human activity in the Arctic. This has resulted in significantly more noise from an array of human … Meer lezen

Narwhals: Mysterious unicorns of the sea

The narwhal is an elusive, mysterious resident of the remote Arctic. The species, a relatively small whale adapted for extreme icy environments, is known for growing a characteristic spiral tusk that resembles the historical portrayal of a unicorn’s horn. >> read more …

Increased shipping stressing out narwhals, say researchers

A new study, discussed on Tuesday, Dec. 8, at the ArcticNet science conference, has found the stress hormone cortisol increased in the marine mammals by 200 per cent after more vessels started visiting Eclipse Sound, near Pond Inlet, after 2006. >> read more …

Onderzoekers onderscheppen de sporadisch gehoorde roep van de narwal

De narwal is een bijzondere arctische tandwalvis, befaamd om de grote, lange slagtand waar mannetjes over beschikken. Veel is er over deze mysterieuze walvisachtige echter niet bekend. Dankzij de hulp van Inuit-jagers is het onderzoekers nu toch gelukt om geluidsopnames van de narwal te maken. >> lees verder …