Almost two out of every three shark or ray species living in coral reefs are at risk of disappearing from the world forever

 by Larry Powell

Bull sharks in Fiji.
This widely-distributed species is among the most at risk of extinction.

The alarming study has just been published in Nature Communiciations.    

It finds, except for marine mammals, these coral sharks and rays are more likely to go extinct than any other wildlife group in the world.

The usual culprits behind this tragic state of affairs have, once again been found to be; overfishing, habitat loss and climate change.

Bluespotted lagoon ray. Photos by Colin Simpfendorfer.

There is a glimmer of hope amid the findings. The ray (above) is the only coral reef shark or ray with an increasing population trend.

UNSUSTAINABLE SAND MINING IN CHINA THREATENS A CRITICALLY-ENDANGERED CETATION

by Larry Powell

The Yangtze finless porpoise feeds in Poyang Lake, where sand is heavily mined. 
Photo by Huigong Yu.

A long-term assessment of theYangtze finless porpoise in a heavily mined lake in China, has made some disturbing discoveries.

Sand mining boats, similar to those in Poyang Lake.
Photo by Zhigang Mei.

In only a decade, the mining has significantly restricted the porpoise’s habitat, compromised its population connectivity, and destroyed its nearshore habitats.

                                             

The researchers hope their findings will promote government accountability and raise general awareness of the plight of the animal.

Two porpoises leap from the water.
Photo by Huigong Yu.

Sand has for some time been second only to water as the planet's most heavily extracted resource, with huge implications for habitat and biodiversity health.

The findings of the research team from the Chinese Academy of Science are now published in the proceedings of the Royal Society. 

Loss of pollinators causing more than 400,000 early deaths a year: study

CTV News

A recent study says pollination loss may be leading to hundreds of thousands of excess deaths worldwide as supplies of healthy food become less plentiful. More here.

THE EARTHSHOT PRIZE

 The Earthshot Prize was designed to find and grow the solutions that will repair our planet this decade. We face our greatest challenge; to regenerate the place we all call home in the next ten years.

We believe in the power of human ingenuity to prove to us all that the seemingly impossible is possible.

Details here.

Fusion energy breakthrough by US scientists boosts clean power hopes

ARS TECHNICA

Net energy gain indicates technology could provide an abundant zero-carbon alternative to fossil fuels. Details here.

Record 2021 heat wave could become once-per-decade event

A study offers new insights into the record 2021 Western North America heat wave

Combined unusual weather systems, supercharged by climate change

COLUMBIA CLIMATE SCHOOL

The heat wave that hammered western North America in late June and early July 2021 was not just any midsummer event. Over nine days, from British Columbia through Washington and Oregon and beyond, it exceeded average regional temperatures for the period by 10 degrees C and, on single days in some locales, by an astounding 30 C. Among many new daily records, it set a new national benchmark for all of Canada, at 121.3 F in Lytton, British Columbia. The next day, the entire town burned down amid an uncontrollable wildfire—one of many sparked by the hot, dry weather. Across the region, at least 1,400 people died from heat-related causes. More here.

New research reveals incredible hunting secrets of the Great Grey Owl

by Larry Powell

 The Great Gray Owl (Strix nebulosa). Photo by Drsarahgrace, public domain.

A new study in Manitoba shows how the “Great Gray Owl,” a common site, either soaring over the plains and perching and nesting in the forests of the eastern Canadian prairies, overcomes many obstacles to find its prey.

  The prairie vole (Microtus ochrogaster) - Photo by Soebe, public domain

The bird is able to "punch" through as much as 50cm (20”) of hard, crusty snow - enough to hold a person’s weight - to catch a vole hiding beneath. (The vole is a small rodent which frequently serves as a meal for the winged predator.)

                       

But the snow presents the owl with other problems way before the “moment of capture,” too. Not only does it hide its prey from site, forcing the bird to rely on its hearing only, it deadens, or attenuates any sound the vole is making, and even "bends" or refracts it, creating an “acoustic mirage,” or false impression of its location. (See above.) The denser the snow, the more pronounced is both the attenuation and refraction. 

The owl soars towards its prey from its perch (above), then hovers as directly over it as it can until it reaches a “listening position” of least refraction and attenuation - defeating that "acoustic mirage" in the process. Then it plummets straight down on its target, forming a “plunge-hole” in the snow.

The owl is superbly adapted for this. While it has no ear tufts, it has the largest “facial disc” of any owl. That's where its ring of feathers filters and amplifies sound at its ears. (See above) This also allows it to pick up low-frequency sound, the kind that transmits best through snow. And its wing feathers are formed in such a way as to allow it to fly and hover more quietly than just about any bird, anywhere.

There are other features that make the “Great Gray” unique, too.

It is the largest owl in North America, with a wing span of well over a metre. It can be found across the province, year-round. And, since Manitobans “adopted” it in 1987, it’s been our official, provincial bird, too!

A three-member team, two from the US, along with James Duncan from “Discover Owls” in Balmoral, Manitoba, used loudspeakers and special cameras in their research.

The above images were extracted, with thanks, from the team's official study, just published in the proceedings of The Royal Society.