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Under Antarctica s ice, Weddell seals produce ultrasonic vocalizations
EUGENE, Ore. Dec. 21, 2020 Weddell seals are chirping, whistling and trilling under Antarctica s ice at sound frequencies that are inaudible to humans, according to a research team led by University of Oregon biologists.
Two years of recordings at a live-streaming underwater observatory in McMurdo Sound have captured nine types of tonal ultrasonic seal vocalizations that reach to 50 kilohertz. Humans hear in the sonic range of 20 to 20,000 hertz, or 20 kilohertz.
The discovery is detailed in a paper published online Dec. 18 ahead of print the Journal of the Acoustical Society of America.
Weddell seals (Leptonychotes weddelii), the world s southernmost-ranging mammal, thrive under the continent s sea ice, using their large teeth to create air holes. They can dive to 600 meters in search of prey and remain submerged for 80 minutes. Researchers had first identified 34 seal call types at sonic frequencies in 1
CHAMPAIGN, ILLINOIS
BBC Newsreports that an international team of researchers led by Alida de Flamingh of the University of Illinois at Urbana-Champaign was able to reconstruct complete mitochondrial genomes for 17 distinct elephant herds with samples taken from 100 tusks recovered from the
Bom Jesus, a Portuguese trading vessel that sank in 1533 while on a voyage to India. The shipwreck was discovered in cold water off the coast of Namibia in 2008. The tusks were so well preserved, de Flamingh explained, that the scientists were also able to determine through chemical analysis that the animals had lived in a mixed forest habitat. Archaeologist Ashley Coutu of the University of Oxford added that only four of the mitochondrial genomes, which are passed along the maternal line, have been detected in living elephant herds today. “That was quite shocking that loss of diversity,” Coutu said. “Next we’d really like to fill in those gaps in a chronological way. We can look at wh
U. Illinois loans devices, Wi-Fi hotspots for early childhood therapy
Sarah Isaacs, librarian of the Early Childhood Collective (left) and Jill Tompkins, research Information specialist for the collective, sit with iPads to be loaned to families of children with disabilities or developmental delays. (University of Illinois)
Share Dec 21, 2020 | EDSCOOP
The University of Illinois at Urbana-Champaign recently began loaning digital devices and Wi-Fi hotspots to families of infants and toddlers with disabilities for free so they can participate in virtual doctor visits.
The Illinois Early Intervention Clearinghouse at UI typically provides in-person speech, occupational therapy and developmental therapy to young children, but since the pandemic has restricted face-to-face meetings, they university switched to a telehealth model. However, this meant that families without access to technology could not receive the therapy they needed for their children, according to a univers
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Not all shipwrecked treasure is gold and silver. One might think of a sunken herd, rather than a sunken hoard, as more than a hundred elephant tusks raised alongside the cargo of a stricken ship present a legacy of DNA to support a global history of our now endangered elephant population s ancestors.
Image: An African forest elephant (Loxodonta cyclotis).
Credit: Nicholas Georgiadis
In 1533, a Portuguese trading vessel carrying forty tons of gold and silver coins along with other precious cargo went missing on its way to India. In 2008, this vessel, known as the Bom Jesus, was found in Namibia, making it the oldest known shipwreck in southern Africa. Now, an international collaboration of researchers in Namibia, South Africa, the United Kingdom, and the United States reporting in the journal