Science
The Hitchhiker’s Guide to the Hummingbird
Flower mites spend their lives slurping nectar and nibbling pollen in flowers throughout the tropics. To travel from one blossom to another, these tiny, eight-legged creatures hitch rides on the beaks of hummingbirds, taking shelter in the birds’ nostrils during flight.
When a speedy hummingbird arrives at a flower to drink nectar, mites run toward its beak to get onboard before eventually transferring to another blossom. But the poppy-seed-size mites are basically blind and can’t jump, said Carlos Garcia-Robledo, a biologist at the University of Connecticut. How do they sense the bird’s presence and attach to it so quickly?
While doing research at La Selva Biological Station in Costa Rica, Dr. Garcia-Robledo and his colleagues decided to try to answer this question.
In a study published Monday in Proceedings of the National Academy of Sciences, the team discovered that flower mites can sense the same kinds of modulated electric fields that hummingbirds create when their wings rapidly flutter next to a flower. Moreover, these electric fields can also rapidly lift mites across a small air gap.
This is the first time that the ability to sense electric fields has been found in mites, and it suggests that this “electroreception” may be widespread and ecologically important, said Daniel Robert, a biologist at the University of Bristol in England who has published many studies on electroreception.
In the study, Dr. Garcia-Robledo and the biologists Diego Dierick and Konstantine Manser devised experiments to assess the mites’ abilities.
In one, they placed mites near an electrode above a grounded copper plate. When the electrode was off or imbued with a nonmodulated electric field, all but one of the mites walked away.
When it was turned on and vibrating within the range of electric fields that emanate from hummingbirds, almost all mites stayed and lifted their two front legs toward the electrode.
In the first test, the mite reacted instantly, Dr. Garcia-Robledo said. “I was surprised the response was so evident and fast,” he said.
In another experiment, the animals were placed in a glass “arena” that had negatively and positively charged ends. When the current was switched on, the mites ran to the positively charged side, much as they rush toward positively charged hummingbirds in nature.
The scientists looked closely at the mites’ front legs and discovered they contain structures similar to Haller’s organs, sensory hairs that help ticks sense chemical cues and heat. On each leg, they also found three hairs that closely resemble those that spiders use to measure electrical fields.
More experiments showed that mites with both front legs removed did not appear to be attracted to the modified electric field but that those with one leg were.
They also anesthetized mites and brought an electrode toward them until the electric field was sufficient to lift the animals across an air gap of between 0.5 to 3 millimeters. The mites could travel 150 body lengths per second, one of the highest speeds ever measured among land animals.
“They are super, super fast,” Dr. Garcia-Robledo said.
The study strongly suggests that mites are indeed glomming onto birds using these fields in nature, he said, briefly moving more swiftly than their flying hosts ever do.
Dr. Robert, who was not involved in the study, said the finding raised other intriguing questions. By sensing signals embedded within a hummingbird’s electrical field, mites might be able to learn something about the animal itself. Could this include species-level recognition, as different birds vary in size, shape and flapping frequency?
Electroreception is widespread in aquatic animals, but is less common on land. Previous studies have shown that bumblebees can sense the electrical fields of flowers and use them to assess whether the flowers have been recently visited by other pollinators. Hoverflies appear capable of doing this as well.
Spiders can also sense electric charge in the atmosphere, which helps them with a behavior called ballooning. Another arachnid, the castor bean tick, uses electrostatic charge to attach to hosts.
This paper is the first to show electric fields being used in phoresis, the technical term used when one creature temporarily hitchhikes on another (a habit that is distinct from the parasitism practiced by ticks).
“This elegant study is really exciting because it introduces yet another ecological context in which animals use electroreception,” said Sam England, a biologist at Museum für Naturkunde in Berlin, Germany.
Flower mites are parasites of their host blooms, depleting some of the same nectar that ever-hungry hummingbirds consume. But the birds don’t seem to mind and don’t seem to try to get rid of them.
“Most hummingbirds have these mites on them,” Dr. Garcia-Robledo said.
Science
China Launches Reusable Rocket in Race With SpaceX
Video released by Chinese state media shows a state-owned aerospace company launching a rocket and recovering part of it on Friday. The successful launch of a reusable rocket was a major step for China toward challenging SpaceX’s satellite internet dominance.
Science
Nobel Prize winner leaving UC Berkeley for new role in China
Nobel Prize recipient Omar Yaghi is leaving his role at UC Berkeley to lead the development of a new artificial intelligence institute at Tsinghua University in Beijing, the Chinese university announced.
Yaghi will head the AI Chemistry and Materials Research Institute at Tsinghua, where he was appointed an honorary professor in 2022. Known as AIMATRY (AI × Materials × Chemistry), the new center will focus on material design and synthesis through artificial intelligence, according to a statement from the university.
In 2025, Yaghi shared the Nobel Prize in chemistry with Susumu Kitagawa of Kyoto University and Richard Robson of the University of Melbourne for their development of metal-organic frameworks, a type of super-porous material in which metal ions and carbon-based molecules combine to form crystals with exceptionally large surface areas.
The material has the potential to combat climate change by capturing and storing carbon or other pollutants, and by extracting water from the atmosphere in water-scarce areas. Upon awarding the prize, a member of the Nobel committee likened the technology’s ability to store enormous amounts of stuff in seemingly compact spaces to Hermione Granger’s enchanted handbag in the Harry Potter series.
Yaghi’s Irvine-based company, Atoco, has said it will start taking orders later this year for its technology that harvests water from the air.
A representative for Yaghi said he was not yet available to respond to questions.
China is one of several countries that has been actively recruiting scientists from the U.S., where the Trump administration has slashed science funding, suspended research grants, fired science advisors and tightened immigration restrictions.
“For many, many years, our funding was very competitive; if you worked hard and you were doing good research, you would get funding,” Yaghi said of the U.S. in an interview with Scientific American earlier this year. “The current state is not so encouraging because of the cutting back on grants and support of science by the very agencies that many university researchers rely on.”
Yaghi was born in Jordan to Palestinian refugees, and immigrated to the U.S. when he was 15 to study.
“We’ve learned over and over in human civilization that scholars can move across borders,” Yaghi told the New York Times last year. “This is how knowledge spread and how vast regions of the world lifted themselves out of poverty.”
Science
Trump administration seeks to limit federal funding that doesn’t ‘advance’ presidential policies
A new rule proposed by the White House Office of Management and Budget would fundamentally overhaul the way federal grants are awarded and overseen — a sweeping change that one scientific society said “would all but end the use of scientific merit in the selection of grants and programs across the government.”
Proposed in late May, the rule would give political appointees unprecedented control over federal grants for research, education and infrastructure, and specifies that government funds can only be spent on projects “aligned with administration policies and priorities,” according to a copy of the proposed rule.
The rule would also restrict research topics, limit U.S. scientists’ ability to collaborate with colleagues in other countries and make it easier for the government to suspend or cancel grants at any time.
The changes are intended to improve “transparency, accountability, and oversight for Federal awards” while “ensuring that American tax dollars are not wasted or misused,” according to the White House office.
But critics say that if the rule is implemented, the final sign-off for grants will no longer be in the hands of subject-matter experts within individual agencies, but in those of political appointees.
“This touches all parts of American life,” said Dr. Eric Rafla-Yuan, a psychiatrist who practices at the Veterans Administration and San Diego County’s psychiatric hospital.
“Control of how all of the federal grants and programs are funded will fall under a small group of highly partisan individuals who would have very few limits on how they spend these billions of taxpayer dollars,” said Rafla-Yuan, who also chairs the Committee to Protect Public Mental Health advocacy group. “This touches everyone’s life, even if they don’t realize it.”
OMB published the proposed rule May 29, opening a 45-day comment period that closes July 13.
Opposition to the proposed rule has mobilized multiple sectors of society. Professional groups representing cancer researchers, civil engineers, county governments, medical schools, housing agencies, city and municipal governments, nonprofits and others have publicly expressed concerns about potential consequences.
By midday Thursday, the Federal Register logged nearly 100,000 comments about the proposal, many of them expressing concern.
“I understand the need for oversight, fiscal responsibility, and accountability. That is not the issue,” wrote Jack Feldman, a neuroscientist who holds the David Geffen School of Medicine Chair in Neuroscience at UCLA. “The issue is whether scientific research is to be judged by scientific merit, or whether it can be approved, denied, or terminated according to broad political criteria that may change from one administration to the next.”
Crucially, the rule converts policies governing federal grants from “guidance” into binding regulations that all agencies would be required to follow. It would give political appointees power to override federal agencies’ merit-based reviews and mandate that a political appointee review decisions to ensure that all awards “demonstrably advance the President’s policy priorities.”
The elevation of political appointees in what were previously merit-based decisions has alarmed many scientists.
“The proposed rule changes would all but end the use of scientific merit in the selection of grants and programs across the government,” read a statement from the Planetary Society, a nonprofit dedicated to space research.
Researchers and science groups have also expressed concern about a section of the rule prohibiting the promotion of “theories of disparate-impact liability” — a legal concept that refers to policies that appear neutral but cause disproportionate harm to certain groups.
The section’s vague language and many loopholes could have a chilling effect on any research that studies the effects of a disease, policy or public health intervention on any specific group of people, Rafla-Yuan said.
As an example, he said, “if there’s a specific age range that is at higher risk for suicide, and we want to figure out, well, what’s going on with people that are aged 14 to 19 … we can’t do that under the wording in this rule.”
New restrictions on collaborations with scientists in other countries would hinder opportunities for U.S. researchers and limit innovation, said Joanne Padrón Carney, chief government relations officer for the American Assn. for the Advancement of Science.
“Science is a global enterprise. Especially in biomedical and public health fields, diseases don’t care about borders or government policies,” she said.
California’s congressional delegation sent a letter Wednesday asking OMB to rescind the proposal, outlining concerns about its impact on scientific innovation, U.S. competitiveness and the fiscal stability of local governments, many of which rely on federal grants for local services.
The proposed rule grants the federal government broad powers to suspend or cancel grants for any reason, introducing “unprecedented unpredictability into local governance,” the lawmakers wrote, “leaving vital infrastructure projects unfinished and abandoning vulnerable populations who rely on these services.”
Republican Sen. Susan Collins has also asked the White House to withdraw certain parts of the letter and extend the public comment period, saying the proposed rule as written would “harm small and rural communities, undermine scientific and biomedical research, and conflict with Congress’ control over the federal funding process.”
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