The animals tagged for this study exhibited profound diving capabilities; however, the dive depths and durations reported here far exceed the prior records for this species. The deepest dive of 2992 m.
Diel patterns in dive behaviour were strongly evident in this dataset, confirming previous observations from short overnight deployments that this whale spends significantly more time in waters above 50 m at night than they do during the day.
Researchers from the British Antarctic Survey found that although female humpback whales have crossed from one hemisphere to another at certain times in the last few thousand years, they generally stay in their ocean of birth.
This isolation means they have been evolving semi-independently for a long time, so the humpbacks in the three global ocean basins should be classified as separate subspecies. This has implications for how we think about their conservation and recovery on a regional scale.
“Further genetic sequencing and analysis should also help us to understand more about the pattern of humpback migrations in the past. Big changes in the ocean can leave signatures in the genetic code of marine species. For example, the last glacial maximum caused many to shift southwards until the ice retreated or to find ice-free areas in the north.
Humpbacks are excellent oceanographers; they go where the food is and can travel long distances to get it, so their patterns of past migration can tell us a lot about the ocean thousands of years ago.”
The researchers used a combination of DNA analysis and physical characteristics to identify the new species from seven specimens found stranded in Sri Lanka, the Gilbert Islands (now Kiribati), Palmyra Atoll in the Northern Line Islands near Hawai'i, the Maldives, and the Seychelles.
The first specimen was a female found washed up on a Sri Lankan beach more than 50 years ago. At the time the National Museums of Ceylon, P.E.P (Paulus) Deraniyagala, described it as a new species, and named it Mesoplodon hotaula, after the local Singhala words for 'pointed beak'.
Trekking Canada’s Sub-Arctic Region in Manitoba
Following a public outcry, the US National Oceanic and Atmospheric Administration (NOAA) announced that it has denied the Georgia Aquarium's request for a permit to import 18 beluga whales from Russia. NOAA Fisheries based the decision on requirements of the Marine Mammal Protection Act (MMPA).
A team of researchers, led by the University of St Andrews, has discovered that a new feeding technique has quickly spread to 40 per cent of a humpback whale population. Humpbacks around the world herd shoals of prey by blowing bubbles underwater to produce 'bubble nets'.
The feeding innovation, called 'lobtail feeding', involves hitting the water with the tail before diving to produce the bubble nets. Lobtail feeding was first observed in 1980, after the stocks of herring, previously the main food for the whales, became depleted.
Excerpts from Current Biology, Volume 22, Issue 20, R860-R861, 23 October 2012
The whale lived among a group of dolphins and socialized with two female white whales. The whale was exposed to speech not only from humans at the surface -- it was present at times when divers used surface-to-diver communication equipment.
Beaked whale species are thought to be sensitive to noise arising from certain human activities; in 2000, beaked whale strandings were observed coinciding with naval sonar exercises in the Bahamas.
Understanding the distribution and behavior of these species is important to minimize harmful impacts from human uses of the ocean.
A research team from Duke University, Woods Hole, and the Naval Undersea Warfare Center listened for foraging beaked whales and measured ocean features and distributions of prey off the eastern coast of Andross Island in the Bahamas.
Researchers have discovered that differences in the patterned clicks of sperm whale communication may lean towards culture rather than genetics. A study published in Behaviour Genetics suggests that sperm whale groups are made up of individuals that use the same dialect, rather than those that come from a similar area of the Pacific.
A team of paleobiologists surveyed hundreds of modern and ancient whale skeletons for decompression syndrome, which occurs when quick pressure changes force air or fat bubbles out of blood vessels.
Such damage would have been common when whales first began plunging into the depths of the ocean, says Brian Beatty, of New York College of Osteopathic Medicine in Old Westbury, US, who led the study.
