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Drone footage provides new insight into gray whales’ acrobatic feeding behavior

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Drone footage provides new insight into gray whales’ acrobatic feeding behavior


Drone footage provides new insight into gray whales' acrobatic feeding behavior
Credit: Oregon State University

Drone footage captured by researchers in Oregon State University’s Marine Mammal Institute is offering new insight into the acrobatics undertaken by gray whales foraging in the waters off the coast of Oregon.

The whales’ movements, including forward and side-swimming, headstands and the use of “bubble blasts” change as the whales grow, said Clara Bird, a researcher in the Marine Mammal Institute’s Geospatial Ecology of Marine Megafauna Laboratory.

Using drone footage captured over seven years, Bird quantified the gray whales’ behavior and their individual size and body condition. She found that the probability of whales using these behaviors changes with age.

Younger, smaller whales are more apt to use forward swimming behaviors while foraging. Older, larger whales are more likely to headstand, a head-down position where the whale is pushing its mouth into the ocean floor. The probability of whales using these behaviors changes with age.

“Our findings suggest that this headstanding behavior requires strength and coordination. For example, we often see whales sculling much like synchronized swimmers do while they are headstanding. It is likely this behavior is learned by the whales as they mature,” said Bird, who led the research as part of her doctoral dissertation.

“We have footage of whale calves trying to copy this behavior and they’re not able to do it successfully.”

The findings were just published in two new papers authored by Bird and co-authored by Associate Professor Leigh Torres, who leads the GEMM Lab at Hatfield Marine Science Center in Newport. The paper about the bubble blast behavior was published in Ecology and Evolution.

Since 2015, Torres and her research team have been studying the health and habits of the Pacific Coast Feeding Group, a roughly 200-member subgroup of whales who spend their summers feeding off the coast of Oregon, Washington, northern California and southern Canada, rather than traveling north to the Arctic as most of the 19,000 gray whales in the Eastern North Pacific population do. These whales face elevated exposure to human activities in some locations, including boat traffic, noise and pollution, while they feed in the shallow waters along the Pacific Northwest Coast.

“It’s been an amazing journey of discovery over the last 10 years learning about how cool these gray whales are. They are underwater acrobats, doing tight turns, upside-down swimming and headstands,” Torres said.

“We have now connected these behaviors with the habitat, size and age of the whale, which allows us to understand much more about why they go where they go and do what they do. This will help us protect them in the long run.”

The new study shows that whales are changing foraging tactics depending on the habitat and depth of the water they are in. For example, they are more likely to use headstanding when they are on a reef, because their primary prey, mysid shrimp, tend to aggregate on reefs with kelp, Bird said.

The researchers also investigated why the gray whales perform “bubble blasts”—a single big exhale while they’re underwater that produces a large circle pattern at the surface.

“While it was thought that bubble blasts helped gray whales aggregate or capture prey, our study shows that bubble blasts are a behavioral adaptation used by the whales to regulate their buoyancy while feeding in very shallow water,” Torres explained.

Larger, fatter whales were more likely to bubble blast, especially while performing headstands. The bubble blasts were also associated with longer dives, supporting the hypothesis that the behavior helps whales feed for a longer period of time underwater.

“It is just like when we dive underwater, if we release air from our lungs, then we can stay underwater more easily without fighting the buoyancy forces that push us back toward the surface,” Bird said.

Together, the two papers provide new insight into how whales’ size affects their behavior and the role social learning may play in whales’ adoption of these behaviors, she said.

“Because these whales are feeding close to shore, where the water is shallow and we can capture their behavior on video, we’re able to really see what is happening,” Bird said. “To be able to study the whales, in our backyard, and fill in some answers to questions about their behavior, feels very special.”

The paper on the gray whales‘ foraging tactics was published in the journal Animal Behaviour. Co-authors of that paper include K.C. Bierlich, Marc Donnelly, Lisa Hildebrand and Alejandro Fernandez Ajó of the GEMM Lab in the Marine Mammal Institute; Enrico Pirotta of the University of St. Andrews and Leslie New of Ursinus College in Pennsylvania. Additional co-authors were Bierlich, Hildebrand, Fernandez Ajó, Pirotta and New.

More information:
Clara N. Bird et al, Growing into it: evidence of an ontogenetic shift in grey whale use of foraging tactics, Animal Behaviour (2024). DOI: 10.1016/j.anbehav.2024.06.004

Clara N. Bird et al, Bubble blasts! An adaptation for buoyancy regulation in shallow foraging gray whales, Ecology and Evolution (2024). DOI: 10.1002/ece3.70093

Citation:
Drone footage provides new insight into gray whales’ acrobatic feeding behavior (2024, September 25)
retrieved 25 September 2024
from https://phys.org/news/2024-09-drone-footage-insight-gray-whales.html

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part may be reproduced without the written permission. The content is provided for information purposes only.





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Nanostructures in the deep ocean floor hint at life’s origin

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Nanostructures in the deep ocean floor hint at life’s origin


Nanostructures in the deep ocean floor hint at life's origin
a) Photograph of HV precipitates collected from the Shinkai Seep Field. b) Cross-polarized optical microscope images of precipitates in cross section. c,d) Scanning electron images showing layers within the precipitates. f) Magnification showing sublayers in the boxed area of d. Credit: RIKEN

Researchers led by Ryuhei Nakamura at the RIKEN Center for Sustainable Resource Science (CSRS) in Japan and The Earth-Life Science Institute (ELSI) of Tokyo Institute of Technology have discovered inorganic nanostructures surrounding deep-ocean hydrothermal vents that are strikingly similar to molecules that make life as we know it possible. These nanostructures are self-organized and act as selective ion channels, which create energy that can be harnessed in the form of electricity.

Published Sept. 25 in Nature Communications, the findings impact not only our understanding of how life began, but can also be applied to industrial blue-energy harvesting.

When seawater seeps way down into the Earth through cracks in the ocean floor, it gets heated by magma, rises back up to the surface, and is released back into the ocean through fissures called hydrothermal vents. The rising hot water contains dissolved minerals gained from its time deep in the Earth, and when it meets the cool ocean water, chemical reactions force the mineral ions out of the water where they form solid structures around the vent called precipitates.

Hydrothermal vents are thought to be the birthplace of life on Earth because they provide the necessary conditions: they are stable, rich in minerals, and contain sources of energy. Much of life on Earth relies on osmotic energy, which is created by ion gradients—the difference in salt and proton concentration—between the inside and outside of living cells.

The RIKEN CSRS researchers were studying serpentinite-hosted hydrothermal vents because this kind of vent has mineral precipitates with a very complex layered structure formed from metal oxides, hydroxides, and carbonates.

“Unexpectedly, we discovered that osmotic energy conversion, a vital function in modern plant, animal, and microbial life, can occur abiotically in a geological environment,” says Nakamura.

The researchers were studying samples collected from the Shinkai Seep Field, located in the Pacific Ocean’s Mariana Trench at a depth of 5,743 m. The key sample was an 84-cm piece composed mostly of brucite. Optical microscopes and scans with micrometer-sized X-ray beams revealed that brucite crystals were arranged in continuous columns that acted as nano-channels for the vent fluid.

The researchers noticed that the surface of the precipitate was electrically charged, and that the size and direction of the charge—positive or negative—varied across the surface. Knowing that structured nanopores with variable charge are the hallmarks of osmotic energy conversion, they next tested whether osmotic energy conversion was indeed occurring naturally in the inorganic deep-sea rock.

Nanostructures in the deep ocean floor hint at life's origin
Schematic showing osmotic power generation upon exposure to potassium chloride (KCl). Overlap of electric double layers within nanopores establishes a screening barrier that is permeable only to ions with specific charges. Credit: RIKEN

The team used an electrode to record the current-voltage of the samples. When the samples were exposed to high concentrations of potassium chloride, the conductance was proportional to the salt concentration at the surface of the nanopores. But at lower concentrations, the conductance was constant, not proportional, and was determined by the local electrical charge of the precipitate’s surface. This charge-governed ion transport is very similar to voltage-gated ion channels observed in living cells like neurons.

By testing the samples with chemical gradients that exist in the deep ocean from where they were extracted, the researchers were able to show that the nanopores act as selective ion channels. At locations with carbonate adhered to the surface, the nanopores allowed positive sodium ions to flow through. However, at nanopores with calcium adhered to the surface, the pores only allowed negative chloride ions to pass through.

“The spontaneous formation of ion channels discovered in deep-sea hydrothermal vents has direct implications for the origin of life on Earth and beyond,” says Nakamura. “In particular, our study shows how osmotic energy conversion, a vital function in modern life, can occur abiotically in a geological environment.”

Industrial power plants use salinity gradients between seawater and river water to generate energy, a process called blue-energy harvesting. According to Nakamura, understanding how nanopore structure is spontaneously generated in the hydrothermal vents could help engineers devise better synthetic methods for generating electrical energy from osmotic conversion.

More information:
Osmotic energy conversion in serpentinite-hosted deep-sea hydrothermal vents, Nature Communications (2024). DOI: 10.1038/s41467-024-52332-3. www.nature.com/articles/s41467-024-52332-3

Citation:
Nanostructures in the deep ocean floor hint at life’s origin (2024, September 25)
retrieved 25 September 2024
from https://phys.org/news/2024-09-nanostructures-deep-ocean-floor-hint.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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UK oil and gas workers risk becoming the ‘coal miners of our generation’

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UK oil and gas workers risk becoming the ‘coal miners of our generation’


coal-fired power plants
Credit: Frans van Heerden from Pexels

At the end of September, the UK’s last remaining coal power plant, Ratcliffe-on-Soar in Nottinghamshire, will be retired. The closure of the plant should—and will—be celebrated by environmentalists, as the move away from coal has made Britain’s electricity much cleaner over the past decade. It is on this basis that the UK claims climate leadership.

In the 1950s, coal provided the overwhelming majority of British energy, and as recently as 2012 it still generated 40%. By 2022, it was less than 2%. In a month’s time, it will be zero.

Phasing out coal was a brutal and profound process. Organized labor was decimated, entire regions were forced into decline, and communities were left with sustained economic, social and health problems. The towering ghosts of power stations like Ratcliffe-on-Soar will haunt Britain’s ongoing effort to phase out North Sea oil and gas and replace it with clean energy.

And we are witnessing this haunting in real-time. After the Labor government announced its plans to end new licenses for oil and gas in British waters—necessary to meet the Paris Agreement—workers and trade unions feared history would repeat itself in terms of job losses and blighted communities.

The general secretary of Unite, Sharon Graham, noted that without a more thorough plan, the policy risked creating “the coal miners of our generation.” A recent motion at the Trades Union Congress (TUC) gathering in Brighton called for no ban on oil and gas licensing before a fully funded jobs guarantee is agreed. The motion narrowly passed.

Workers and unions are demanding a “just transition” from polluting industries into the clean industries of the future. But to achieve this, the UK government must learn from what happened with coal.

Many places still rely on oil and gas jobs

Although oil and gas are not as embedded throughout British life as coal once was, there are many settlements and larger areas still dependent on energy jobs. Grangemouth in central Scotland is a good example. In November 2023, the owner, Petroineos, announced plans to close the town’s oil refinery in 2025, bringing a century of production to an end at the cost of 400 jobs.

Even if the UK government did issue new oil and gas licenses, the North Sea faces structural decline. Production peaked around the turn of the century. Since 2014, as many as 200,000 jobs have been lost either offshore or along the supply chain onshore.

From gas to wind?

Planning for the end of fossil fuels is therefore an urgent endeavor. The dominant strategy for protecting skilled jobs is to transition workers into the industries set to replace North Sea production: wind energy and other low-carbon technologies.

However, though Britain has developed a large wind power sector, it remains a major importer of turbines. Domestic manufacturing makes only a small contribution, and developers are not required to use British-made turbines or other parts, despite the jobs this would create.

This has left Grangemouth workers discontented. When one of us (Ewan Gibbs) and Riyoko Shibe interviewed young refinery workers at Grangemouth earlier this year, many commented that there were relatively few jobs in renewables. When jobs were visible on LinkedIn and comparable job sites, one told us that “you’ll see there’s a big difference in terms and conditions.”

In its current form, the UK wind industry will find it hard to provide the types of secure ongoing employment that oil and gas historically has. Most jobs are in the construction and maintenance of wind farms, with the latter threatened by automation. Without public investment and a targeted industrial policy, Britain will remain a net importer of wind technology, and the phasing out of North Sea oil and gas will prove costly in job terms.

More investment needed

Britain’s lack of state intervention is not the norm. After all, more than half of British wind farms are state-owned, though less than 1% are owned by the UK government. Swedish, Norwegian, French, Irish and German state-owned entities are major players, but the biggest is Denmark’s Ørsted, a former oil company turned renewables giant which is mostly state-owned. In the UK’s most recent offshore wind auction, 70% of the projects were awarded to Ørsted.

The newly launched Great British Energy could give the state a foothold in the North Sea once more. This publicly owned company plans to focus on domestic manufacturing and will invest in ports and other infrastructures to “unlock strategic bottlenecks.”

But if such projects are to be meaningfully incorporated into a just transition, they will need to offer continuity and security to oil and gas workers. As one Grangemouth worker put it, referring to his colleagues facing the choice of either remaining unemployed locally or relocating to use their skills:

“They’re moving to the Middle East, they’re moving to the north-east of Scotland. They’re moving offshore, they’re moving to the Shetlands, and therefore it’s not just a transition, in my view, if we’re moving to these jobs.”

Another worker highlighted the risks that Grangemouth could join the coalfields in becoming “stranded” communities:

“We’ve got a community that’s been built round the site, we’ve got skills and we’ve got people that work there, we’ve got the infrastructure there—why should we not have these jobs when the time comes to move to these industries? Why can we not have it at Grangemouth?”

Britain’s push to phase out oil and gas is urgent and necessary, but it cannot follow the same trajectory as Britain’s exit from coal—lessons must be learned. The opportunities presented by the transition away from fossil fuels will only be fully realized if workers are at its center.

Provided by
The Conversation


This article is republished from The Conversation under a Creative Commons license. Read the original article.The Conversation

Citation:
UK oil and gas workers risk becoming the ‘coal miners of our generation’ (2024, September 25)
retrieved 25 September 2024
from https://techxplore.com/news/2024-09-uk-oil-gas-workers-coal.html

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Why crickets swarm in the fall

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Why crickets swarm in the fall


cricket
Credit: CC0 Public Domain

Cricket swarms—thousands of field crickets assembling in one location, typically around urban/suburban buildings—can be alarming. They can also be annoying. But like most annoyances, they pass with time.

Wizzie Brown, Texas A&M AgriLife Extension Service integrated pest management specialist in the Texas A&M Department of Entomology, said the annual phenomenon can be startling, but that it’s nothing to fear and their presence is only temporary.

“These swarms happen every late summer and fall to some degree,” she said. “The crickets don’t sting or bite, so they’re not doing anything other than being annoying, especially if a male gets into your house and is chirping to attract females.”

Crickets, cool fronts and bright lights

When and where you see swarms of crickets seems patchy and random, Brown said. It is random to the degree that one location or area may see incredibly high cricket numbers one year and not see many at all the next.

But the timing of these mass accumulations of field crickets and the likely cause for them isn’t so random, she said.

The timing revolves around cool fronts spurring increased activity, Brown said. Like many of us, crickets don’t like heat. They hatch in early spring, reach adulthood in three months, and by the heat of summer, are looking for places to stay cool.

They forage on things like dead insects and vegetation at night and keep a relatively low profile during the heat of the day, she said. Cool fronts in the waning weeks of summer and early fall change that.

The other contributing factor to swarms—light—then contributes to the mass gathering of crickets when they become more active. Buildings with bright, dusk-to-dawn lighting attract them.

“You’ll notice that they tend to congregate around the front doors of businesses, at gas stations, car dealerships and other businesses and locations that have highly luminous lighting that is on all night,” she said. “If you’ve noticed crickets around your house, it’s probably in relation to lighting.”

Crickets seasonal swarming

Brown said there can be multiple generations of crickets in a year, especially in warmer parts of the state. Warm winters can also dictate the number of cricket generations per year.

Like most insects, field crickets‘ numbers rise, peak and fall seasonally, she said. The window for crickets to gather in mass typically lasts four to six weeks before their numbers begin to decline.

During that time, Brown said turning off unnecessary lights can reduce the chance crickets will swarm around your home or business. There are also specialty bulbs that are less attractive to insects.

“Attracting crickets can lead to them getting inside structures and homes, especially with poor sealing around doors and windows,” she said. “A bunch of dead crickets can be a stinky mess, so it’s smart to leave the lights off as much as possible as that summer-to-fall transition happens.”

Citation:
Why crickets swarm in the fall (2024, September 25)
retrieved 25 September 2024
from https://phys.org/news/2024-09-crickets-swarm-fall.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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Are tougher political sanctions better? A statistical model compares political and economic relationships to success

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Are tougher political sanctions better? A statistical model compares political and economic relationships to success


war
Credit: Алесь Усцінаў from Pexels

Before beginning its war of aggression against Ukraine in 2022, Russia had already conducted an aerial bombardment of Georgia in 2008 and invaded Crimea as well as the Donbas region in 2014. This has left politicians and researchers puzzling over the question: Would it have been possible to prevent the current war in Ukraine if countries had implemented more decisive and intensive sanction policies back then?

In a new study, Gerald Schneider, a professor of international politics at the University of Konstanz, and Thies Niemeier, a doctoral researcher at the Konstanz Graduate School of the Social and Behavioural Sciences (GSBS), project how effective tougher sanctions could have been. The work is published in the journal Research & Politics.

Their assessment is based on a statistical model that compares the political and economic relationships between countries to the success of sanctions. This allows them to identify the factors that are likely to make sanctions more successful. These variables include a higher intensity of sanctions, closer economic ties to the sanctioned country and the country’s history of having been a colony of a European country.

Taking lessons from the past

“It is extremely important for politicians to be able to fully assess the likely consequences of various political measures. Ideally, they should be able to evaluate these effects ahead of time and decide accordingly,” says lead author Niemeier.

However, even afterwards it is useful to draw conclusions about the connection between the strength of sanctions and their impact. The researchers use “counterfactual scenarios” to analyze what would have happened differently if certain political measures had been taken earlier, had been more robust or had been implemented differently.

Niemeier and Schneider studied sanctions levied against Egypt, Burundi, Mali and Russia by the European Union and the United States. They classify sanctions into different degrees of intensity. According to their model, examples of “light measures” include restrictions on the freedom of movement of specific Russian oligarchs implemented after 2014, as well as barriers to investment by individual Russian companies.

Further categories of sanctions involve steps like banning the arms trade and freezing development aid or limiting trade in certain industrial sectors. The toughest category includes wide-ranging economic embargoes, like those once introduced against South Africa and currently imposed on Russia.

The greater the intensity, the greater the effectiveness

The researchers found that—at least with regard to the EU—robust measures in response to Russia’s annexation of Crimea and the invasion of the Donbas region would have had a greater impact than the moderate approach that had been used.

“When they are more credible and costly for the target country, economic sanctions are more likely to induce the country to make concessions,” says Schneider. Especially in Africa, it has proven successful on several occasions for the EU or U.S. along with the African Union or the Economic Community of West African States (ECOWAS) to mount a quick, robust response.

What about Russia? “Our models suggest that intensive sanctions in 2014 would have had a high probability of increasing the cost of future aggression and making President Putin more willing to negotiate,” Schneider explains. “Even if they would probably not have been enough to move Russia to withdraw from Crimea.”

The political scientists base this projection on the close economic and political ties between the EU and Russia as well as the resulting negotiating power of Brussels.

Schneider concludes, “The 2014 sanctions that were watered down as the result of lobbying from the financial and energy industries reinforced President Putin’s mistaken belief that increasing the level of aggression against Ukraine would result in only a few costly sanctions.”

According to the study, while tougher EU sanctions would have made Russia more willing to make concessions, similar measures by the U.S. would have had little success. The model predicts that stronger sanctions by the Western superpower do not necessarily have a greater impact.

US-American strategies in sanctioning

According to the study, the intensity of economic ties to the sanctioned country generally influences how effective sanctions will turn out to be. Being the Western superpower, the United States can follow a different strategy when sanctioning countries.

“When a world power like the United States threatens sanctions, the countries facing the prospect of these sanctions tend to back down so that the sanctions do not actually have to be imposed on them,” Niemeier explains. “Another factor is that the US sometimes enacts strong economic sanctions against countries that depend little on the US economy. These sanctions cannot be successful if they do not cause economic pressure.”

More information:
Thies Niemeier et al, Counterfactual coercion: Could harsher sanctions against Russia have prevented the worst?, Research & Politics (2024). DOI: 10.1177/20531680241272668

Citation:
Are tougher political sanctions better? A statistical model compares political and economic relationships to success (2024, September 25)
retrieved 25 September 2024
from https://phys.org/news/2024-09-tougher-political-sanctions-statistical-economic.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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