Dunes, wasps and bees | Canada News Media
Connect with us

Science

Dunes, wasps and bees

Published

 on

Study expands knowledge of wild bees and wasps in Canada’s disappearing prairie dune habitats

Ottawa, June 19, 2023 – Canada’s southern prairies are dotted with patches of active sand dunes, ecosystems that are slowly disappearing as they become overgrown and transformed into grasslands.

A new study of bees and wasps from these at-risk sites sheds light on changes to biodiversity in Canada’s prairie sandhills, which are increasingly being “stabilized” by plants that take root in the sand. The results are reported in the scientific journal Insect Conservation and Diversity.

Dr. Thomas Onuferko, an entomologist and research associate with the Canadian Museum of Nature, found that while the overall numbers of bee and wasp species did not change much among dunes at different stages of vegetative stabilization, the types of species and their relative abundances did change.

“Species that were not present on active dunes all of a sudden show up on stabilized dunes, and then some species on active dunes don’t show up on stabilized ones,” he explains. The abundances of certain wasps, most notably those specialized to live on the open sandy dunes, decreased with increased colonization of the dunes by plants.

The research is based on careful examination and analysis of more than 12,300 specimens of wild bees and stinging wasps collected by Onuferko at the dunes over four months in the spring and summer of 2019. As a post-doctoral research fellow with the museum’s Beaty Centre for Species Discovery, he visited 13 dune sites (each five times) across southeastern Alberta, southern Saskatchewan, and southwestern Manitoba.

Areas surveyed included the Great Sandhills Ecological Reserve and Douglas Provincial Park in Saskatchewan, as well as Spruce Woods Provincial Park, an important refuge for rare species in southwestern Manitoba. Of the 13 sites, eight were active dunes with large areas of open sand, three were stabilized with no patches of open sand, and two were in intermediate stages of stabilization with patches of open sand among largely vegetated areas.

The insects were collected with relatively simple techniques. Most were caught in coloured plastic bowls that were filled with soapy water and placed at specific distances each day. Smaller numbers were collected in a handheld insect net.

Onuferko was assisted in the identification of the wasps and bees by study co-authors Dr. Matthias Buck, an expert on aculeate (stinging) wasps at the Royal Alberta Museum, and Professor Jason Gibbs, an entomologist and bee expert at the University of Manitoba.

Determination of new wasp records was conducted by Buck and informed by independent ongoing work on spheciform, vespoid, and chrysidoid wasps in conjunction with the Checklist of Hymenoptera of Canada, Alaska and Greenland. The data from this study were also included in a recently published checklist of the bees of Manitoba led by Gibbs and co-authored by Onuferko and eight other collaborators.

In their task of comparing species assemblages and abundances across the range of transforming dune habitats, the team identified 374 species of bees and wasps among their samples. Of these, 150 species represent previously unknown records from at least one of the provinces in which they were sampled. There are 16 new records for Canada and several potentially undescribed species of bees and wasps.

Among the previously undescribed species is a new sweat bee specialized to open dunes, Lasioglossum onuferkoi. It was named after Onuferko by Gibbs and his Ph,D. student Joel Gardner in a taxonomic revision published in 2022. Somewhat surprisingly, Onuferko had collected 360 specimens of the elusive species, which he attributes to focussing on the isolated sandy sites in a relatively small area of Canada.

The study also belies a larger lesson about the need for continuing biodiversity surveys of endangered habitats. “While the results are not really unexpected, this study illustrates that more work needs to be done in this region. Now that we know more about the diversity of bees and wasps in these habitats, it might make sense to look at other understudied groups of insects, and this study provides a baseline for any future surveys,” says Onuferko.

About the sand dune habitats

  • The active sand dunes in the Canadian Prairies are home to diverse plant and animal species specialized for life on sand (called psammophiles, meaning ‘sand loving’).
  • The dunes in this region formed during glacial periods in the Pleistocene when grinding ice sheets reduced bedrock to silt, sand, and gravel.
  • The remaining dunes are islands of biodiversity and home to a variety of species of plants, animals (e.g., kangaroo rats), insects, and spiders that have been assessed as rare, threatened, or endangered within Canada.
  • Prior to this study, little was known about dune-dependent arthropods in this region, other than some small groups like tiger beetles and moths.
  • Grasses and dune scurpfea (Ladeania lanceolota) were the dominant plants on the dunes, and are among the 18 species of plants in the sampling localities which were identified by Canadian Museum of Nature botanist and study co-author Paul Sokoloff.
  • Predatory wasps also use them as hunting grounds.
  • Some bee species might only be found on dunes because the plants from which they prefer to collect pollen are only found growing on the dunes or at their edges.


 

Source link

Continue Reading

News

Here’s how Helene and other storms dumped a whopping 40 trillion gallons of rain on the South

Published

 on

 

More than 40 trillion gallons of rain drenched the Southeast United States in the last week from Hurricane Helene and a run-of-the-mill rainstorm that sloshed in ahead of it — an unheard of amount of water that has stunned experts.

That’s enough to fill the Dallas Cowboys’ stadium 51,000 times, or Lake Tahoe just once. If it was concentrated just on the state of North Carolina that much water would be 3.5 feet deep (more than 1 meter). It’s enough to fill more than 60 million Olympic-size swimming pools.

“That’s an astronomical amount of precipitation,” said Ed Clark, head of the National Oceanic and Atmospheric Administration’s National Water Center in Tuscaloosa, Alabama. “I have not seen something in my 25 years of working at the weather service that is this geographically large of an extent and the sheer volume of water that fell from the sky.”

The flood damage from the rain is apocalyptic, meteorologists said. More than 100 people are dead, according to officials.

Private meteorologist Ryan Maue, a former NOAA chief scientist, calculated the amount of rain, using precipitation measurements made in 2.5-mile-by-2.5 mile grids as measured by satellites and ground observations. He came up with 40 trillion gallons through Sunday for the eastern United States, with 20 trillion gallons of that hitting just Georgia, Tennessee, the Carolinas and Florida from Hurricane Helene.

Clark did the calculations independently and said the 40 trillion gallon figure (151 trillion liters) is about right and, if anything, conservative. Maue said maybe 1 to 2 trillion more gallons of rain had fallen, much if it in Virginia, since his calculations.

Clark, who spends much of his work on issues of shrinking western water supplies, said to put the amount of rain in perspective, it’s more than twice the combined amount of water stored by two key Colorado River basin reservoirs: Lake Powell and Lake Mead.

Several meteorologists said this was a combination of two, maybe three storm systems. Before Helene struck, rain had fallen heavily for days because a low pressure system had “cut off” from the jet stream — which moves weather systems along west to east — and stalled over the Southeast. That funneled plenty of warm water from the Gulf of Mexico. And a storm that fell just short of named status parked along North Carolina’s Atlantic coast, dumping as much as 20 inches of rain, said North Carolina state climatologist Kathie Dello.

Then add Helene, one of the largest storms in the last couple decades and one that held plenty of rain because it was young and moved fast before it hit the Appalachians, said University of Albany hurricane expert Kristen Corbosiero.

“It was not just a perfect storm, but it was a combination of multiple storms that that led to the enormous amount of rain,” Maue said. “That collected at high elevation, we’re talking 3,000 to 6000 feet. And when you drop trillions of gallons on a mountain, that has to go down.”

The fact that these storms hit the mountains made everything worse, and not just because of runoff. The interaction between the mountains and the storm systems wrings more moisture out of the air, Clark, Maue and Corbosiero said.

North Carolina weather officials said their top measurement total was 31.33 inches in the tiny town of Busick. Mount Mitchell also got more than 2 feet of rainfall.

Before 2017’s Hurricane Harvey, “I said to our colleagues, you know, I never thought in my career that we would measure rainfall in feet,” Clark said. “And after Harvey, Florence, the more isolated events in eastern Kentucky, portions of South Dakota. We’re seeing events year in and year out where we are measuring rainfall in feet.”

Storms are getting wetter as the climate change s, said Corbosiero and Dello. A basic law of physics says the air holds nearly 4% more moisture for every degree Fahrenheit warmer (7% for every degree Celsius) and the world has warmed more than 2 degrees (1.2 degrees Celsius) since pre-industrial times.

Corbosiero said meteorologists are vigorously debating how much of Helene is due to worsening climate change and how much is random.

For Dello, the “fingerprints of climate change” were clear.

“We’ve seen tropical storm impacts in western North Carolina. But these storms are wetter and these storms are warmer. And there would have been a time when a tropical storm would have been heading toward North Carolina and would have caused some rain and some damage, but not apocalyptic destruction. ”

___

Follow AP’s climate coverage at https://apnews.com/hub/climate

___

Follow Seth Borenstein on Twitter at @borenbears

___

Associated Press climate and environmental coverage receives support from several private foundations. See more about AP’s climate initiative here. The AP is solely responsible for all content.

Source link

Continue Reading

Science

‘Big Sam’: Paleontologists unearth giant skull of Pachyrhinosaurus in Alberta

Published

 on

 

It’s a dinosaur that roamed Alberta’s badlands more than 70 million years ago, sporting a big, bumpy, bony head the size of a baby elephant.

On Wednesday, paleontologists near Grande Prairie pulled its 272-kilogram skull from the ground.

They call it “Big Sam.”

The adult Pachyrhinosaurus is the second plant-eating dinosaur to be unearthed from a dense bonebed belonging to a herd that died together on the edge of a valley that now sits 450 kilometres northwest of Edmonton.

It didn’t die alone.

“We have hundreds of juvenile bones in the bonebed, so we know that there are many babies and some adults among all of the big adults,” Emily Bamforth, a paleontologist with the nearby Philip J. Currie Dinosaur Museum, said in an interview on the way to the dig site.

She described the horned Pachyrhinosaurus as “the smaller, older cousin of the triceratops.”

“This species of dinosaur is endemic to the Grand Prairie area, so it’s found here and nowhere else in the world. They are … kind of about the size of an Indian elephant and a rhino,” she added.

The head alone, she said, is about the size of a baby elephant.

The discovery was a long time coming.

The bonebed was first discovered by a high school teacher out for a walk about 50 years ago. It took the teacher a decade to get anyone from southern Alberta to come to take a look.

“At the time, sort of in the ’70s and ’80s, paleontology in northern Alberta was virtually unknown,” said Bamforth.

When paleontogists eventually got to the site, Bamforth said, they learned “it’s actually one of the densest dinosaur bonebeds in North America.”

“It contains about 100 to 300 bones per square metre,” she said.

Paleontologists have been at the site sporadically ever since, combing through bones belonging to turtles, dinosaurs and lizards. Sixteen years ago, they discovered a large skull of an approximately 30-year-old Pachyrhinosaurus, which is now at the museum.

About a year ago, they found the second adult: Big Sam.

Bamforth said both dinosaurs are believed to have been the elders in the herd.

“Their distinguishing feature is that, instead of having a horn on their nose like a triceratops, they had this big, bony bump called a boss. And they have big, bony bumps over their eyes as well,” she said.

“It makes them look a little strange. It’s the one dinosaur that if you find it, it’s the only possible thing it can be.”

The genders of the two adults are unknown.

Bamforth said the extraction was difficult because Big Sam was intertwined in a cluster of about 300 other bones.

The skull was found upside down, “as if the animal was lying on its back,” but was well preserved, she said.

She said the excavation process involved putting plaster on the skull and wooden planks around if for stability. From there, it was lifted out — very carefully — with a crane, and was to be shipped on a trolley to the museum for study.

“I have extracted skulls in the past. This is probably the biggest one I’ve ever done though,” said Bamforth.

“It’s pretty exciting.”

This report by The Canadian Press was first published Sept. 25, 2024.

The Canadian Press. All rights reserved.

Source link

Continue Reading

News

The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

Published

 on

 

TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

Source link

Continue Reading

Trending

Exit mobile version