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Meet the Mice Who Make the Forest

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Meet the Mice Who Make the Forest

It’s straightforward to have a look at a forest and assume it’s inevitable: that the bushes got here into being via a stately procession of seasons and seeds and soil, and can replenish themselves as long as environmental circumstances permit.

Hidden from sight are the creatures whose labor makes the forest doable — the multitudes of microorganisms and invertebrates concerned in sustaining that soil, and the animals accountable for delivering seeds too heavy to be wind-borne to the locations the place they’ll sprout.

If one is involved in the way forward for a forest — which tree species will thrive and which can diminish, or whether or not these threatened by a fast-changing local weather will efficiently migrate to newly hospitable lands — one ought to look to those seed-dispersing animals.

“All of the oaks which are making an attempt to maneuver up north try to trace the liveable vary,” stated Ivy Yen, a biologist on the College of Maine who may very well be discovered late one current afternoon on the Penobscot Experimental Forest in close by Milford, arranging acorns on a tray for mice and voles to search out.

“The one means they’re going to maneuver with the shifting temperatures is with the animals,” Ms. Yen stated of the bushes. “Will character have an effect on that? Will there be people who usually tend to assist?”

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Ms. Yen is a doctoral pupil within the lab of Alessio Mortelliti, a wildlife ecologist who arrived in Maine almost a decade in the past with a peculiar curiosity: how seed dispersal intersected with the rising examine of animal character.

Though researchers already studied the ways in which animals transfer seeds throughout landscapes, the doable position of their personalities had gone largely unexamined. The Penobscot Experimental Forest, with its 1,800 acres of carefully monitored woodlands managed in accordance with varied forestry strategies, supplied a landscape-scale setting to discover this query.

Every summer season for the previous seven years, Dr. Mortelliti’s college students have trapped deer mice and southern red-backed voles of their examine plots — about 2,000 animals in all — and run them via checks that measure the place they fall on a spectrum between daring and shy. Earlier than being launched, every is tagged with a microchip, not in contrast to these used to determine misplaced pets.

The tags set off sensors, just like the one which Ms. Yen had mounted above her tray of acorns. Every acorn was painted with coloured bands to point its species: pink oak, bur oak, black oak, white oak, swamp white oak, scarlet oak, pin oak, willow oak. Pink oak are already plentiful within the area, however the different species have arrived solely just lately or are anticipated to, as rising temperatures push their ranges north.

Whether or not these bushes succeed on this slow-motion migration — and ultimately grace new landscapes with their noble, carbon-sequestering, shelter-providing, wildlife-nourishing presence — will probably be a operate of numerous encounters between a mouse or a vole and an acorn.

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Does the animal take the nut? In that case, is the nut eaten promptly or saved for later? The place does the animal cache it? How usually do they fail to return, both as a result of they overlook the placement or — as so usually occurs to bite-size creatures in a forest stuffed with hungry predators — as a result of they’re eaten first, thus giving the acorn an opportunity to germinate?

“Folks see {that a} forest is regenerating,” Dr. Mortelliti stated. “However what folks don’t see is that the forest is regenerating following the choices of small mammals.”

In Dr. Mortelliti’s examine websites, every such encounter is documented. As a mouse or vole approaches an acorn-laden tray; a sensor reads their microchip, figuring out the animal; a motion-activated digicam captures the second, recording which nut they took. Over the course of this season, Ms. Yen stated, she would put out greater than 1,800 acorns.

On this autumn night time, Ms. Yen set out 5 trays, every about 100 toes aside. Surrounding every she scattered a unhazardous fluorescent powder that briefly adheres to the toes of tourists. When she returned earlier than daybreak, outfitted with an ultraviolet flashlight below which the powder fluoresced, small constellations of footprints surrounded every tray and trailed off into the darkness.

Folks don’t notice simply what number of mice and voles there are, Ms. Yen stated. She estimated that, for each 13 steps she took on the way in which to the location, she handed a mouse or vole — not out within the open however hidden beneath a leaf or cozy in a grass-lined burrow. By the sunshine of twinkling stars and a toenail moon, the rodents had carried out their quiet labor. Each acorn was gone.

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One after the other, Ms. Yen adopted every path. The tiny footsteps glowed below her flashlight, main round mossy hummocks and beneath fallen branches and up tree trunks after which again down once more. Because the mouse walks is the alternative of because the crow flies: Some trails petered out, the powder exhausted. Others led to a cache — a hole beneath a root, a decaying stump, a gap dug into the earth and thoroughly coated again up. Ms. Yen marked the ultimate spots with small orange flags.

Some acorns, saved for the approaching winter, have been intact. Others had been consumed, however from the painted shell fragments Ms. Yen recognized the species. With the assistance of Elizabeth Pellecer Rivera, a graduate analysis assistant, she made notes about every one. The sensor knowledge and digicam recordings would later present that a lot of the gathering was carried out by one notably industrious deer mouse recognized to the researchers as 982091062973077, a 13-gram male trapped in late September and revealed by checks to be pretty shy, though with a cautiously exploratory streak.

When the season winds down, Ms. Yen, Dr. Mortelliti and two graduate college students, Maisie Merz and Brigit Humphreys, will analyze all this knowledge and search for patterns.

Perhaps sure character varieties will show extra doubtless than others to pick out sure oaks. It could take an particularly daring rodent to hoist an enormous bur oak acorn, then stagger below its weight, weak to predators, till discovering a hiding spot. Maybe shy mice will probably be extra more likely to secret them in locations greatest suited to germinate a forgotten nut.

The outcomes will be a part of a procession of research which have emerged from the experiment over the previous a number of years, most of them led by Allison Brehm, Dr. Mortelliti’s first doctoral pupil and the one that taught Ms. Yen the best way to observe.

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In a 2019 examine in Ecology Letters, which Dr. Mortelliti described as a “proof of idea,” the researchers confirmed that the personalities of small mammals affect their selection of seeds. Earlier this yr the crew described how some deer mice, relying on their character, have been extra doubtless than others to cache pink oak, white pine and American beech nuts in ways in which promoted germination.

In flip, the personality-specific foraging methods of rodents modified when predators have been round, the researchers confirmed in an Oikos paper in 2021.

And land use alters these dynamics. As an example, the 2019 examine discovered that, in areas that had been logged years earlier, small mammals tended to be daring. A examine the next yr revealed {that a} extra pure forest, with a mixture of habitats quite than the uniformity favored by most business logging, contained a better variety of personalities.

“This variety of character varieties is maintained in populations as a result of it’s a superb factor, similar to genetic variety is an effective factor,” Dr. Brehm stated.

Rafał Zwolak, an ecologist on the Adam Mickiewicz College in Poland who research seed dispersal and animal character, known as the analysis “completely pioneering.”

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“I hope their work will encourage researchers in different labs, working in different ecological programs, to give attention to this matter,” he stated.

Requested to outline the sensible implications of his analysis, Dr. Mortelliti stated, “Protect a variety of personalities.” There’s nobody very best character; quite, totally different people carry out totally different roles. Relying on circumstance — drought, pure disturbances, fluctuations in predator populations — totally different character varieties might come to the fore. These nuanced dynamics don’t preclude timber-cutting, Dr. Brehm stated, however they do argue for taking care.

“If it’s important to handle a panorama, you don’t need to handle all of it the identical means,” she stated. “You need to handle totally different elements in a different way so that you’ve a heterogeneous panorama.” Strategies can be utilized that keep a wide range of tree species, ages and sizes, trying to imitate what would occur naturally.

A lot stays unstudied, Dr. Mortelliti famous. Measures of shyness and boldness aren’t everything of animal character; they’re simply comparatively well-characterized and simple to measure within the area. Oaks apart, lots of of different plant species are shifting their ranges, every following their very own animal-mediated trajectory.

As Ms. Yen completed her work, night time gave option to pre-dawn twilight. A blue jay known as; a pink squirrel chittered. Each are seed dispersers with personalities which will have an effect on their contributions to the forest. The identical may very well be stated of bears, foxes, crows, turtles, even ants — an entire menagerie as but unexamined, affecting not solely crops however even fungi.

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“I’m solely two species at night time,” Ms. Yen stated. “It’s a really small snapshot of what’s taking place.” A full image might not emerge for many years, however the outlines are already clear: It takes a number of personalities to lift a forest.

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FDA approves bladder cancer treatment by Culver City company

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FDA approves bladder cancer treatment by Culver City company

The Food and Drug Administration on Monday approved a new treatment for a type of bladder cancer.

The treatment, which will be sold under the brand name Anktiva, is intended for some patients suffering from certain types of non-muscle invasive bladder cancer, according to an FDA statement announcing the approval.

News of the FDA action was first reported by Reuters, which said, “The therapy works by activating types of disease fighting white blood cells called natural killer (NK) cells and T-cells to create long-term immunity in the body.”

The drug is now being developed by ImmunityBio of Culver City after its initial development by Altor BioScience of Miramar, Fla.

Dr. Patrick Soon-Shiong, whose family owns the Los Angeles Times, is executive chairman of ImmunityBio.

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In a statement, Soon-Shiong heralded the FDA action and called Anktiva “a next-generation immunotherapy.”

The FDA approval was based on the results of a clinical trial led by Dr. Karim Chamie, an associate professor of urology at UCLA’s David Geffen School of Medicine. In a statement released by UCLA Health, Chamie said the treatment offers “a compelling alternative for patients who have exhausted conventional treatment options.”

Anktiva is intended for bladder cancer patients who did not respond to prior treatments, the FDA said. It is delivered via a catheter and prompts the patient’s own immune system “to mount a targeted attack against cancer cells,” Chamie said.

He noted that the treatment could spare some patients from invasive procedures, such as surgery to remove all or part of the bladder.

Most of the new bladder cancer diagnoses are non-muscle invasive — cancer found in the tissue that lines the inner surface of the bladder and hasn’t spread into the bladder wall, according to the UCLA statement. Patients with this type of cancer usually undergo surgery and a bacteria-based immunotherapy, which is placed directly into the bladder.

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However, even with this treatment, the cancer can come back, and many patients don’t respond well to further treatment, leaving some patients with limited options.

Last May, according to Reuters, the FDA declined to approve the new therapy “due to deficiencies in the company’s application.” The FDA cited problems in its inspections and offered the firm suggestions for how to resolve the manufacturing issues that were raised, according to the wire service.

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Carbon Dioxide Levels Have Passed a New Milestone

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Carbon Dioxide Levels Have Passed a New Milestone

Source: National Oceanic and Atmospheric Administration’s Global Monitoring Laboratory

The chart shows monthly numbers of carbon dioxide molecules per million molecules of dry air. Because of seasonal differences, levels are higher in May than in August.

Carbon dioxide acts like Earth’s thermostat: The more of it in the air, the more the planet warms.

In 2023, global levels of the greenhouse gas rose to 419 parts per million, around 50 percent more than before the Industrial Revolution. That means there are roughly 50 percent more carbon dioxide molecules in the air than there were in 1750.

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As carbon dioxide builds up in the atmosphere, it traps heat and warms the planet.

More carbon dioxide, warmer temperatures

Source: NOAA (carbon dioxide); NASA (temperature)

The chart shows the change in global surface temperature relative to 1951–1980, versus global carbon dioxide levels. The dotted line shows the trend line.

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Every additional amount of carbon dioxide in the atmosphere contributes to more warming, which is why climate scientists stress the need to get to zero emissions.

Currently, carbon dioxide levels are rising at near-record rates.

According to data released by the National Oceanic and Atmospheric Administration’s Global Monitoring Laboratory earlier this month, last year had the fourth-highest annual rise in global carbon dioxide levels.

Annual change in carbon dioxide levels

Source: NOAA’s Global Monitoring Laboratory

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The chart shows the increase in global carbon dioxide levels over the course of each year. In 2023, they grew by around 2.8 parts per million.

The long-term rise in carbon dioxide levels is caused by burning fossil fuels, as well as other human activities such as deforestation and concrete production.

But there is also a lot of variation from year to year, which you can see in the chart above.

How much carbon dioxide levels rise in a given year depends on two factors: the amount of fossil fuels burned globally, and the share of these emissions that are absorbed by the land and the ocean.

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Consider the first factor: While it’s true that clean energy production is rising globally, so is the demand for energy.

Fossil fuels have made up the difference. This is why global fossil fuel emissions are still at record-high values (with a brief dip during the pandemic). And they stayed high in 2023, according to a projection by the Global Carbon Budget.

Not all of these emissions end up in the air. The ocean and land absorb roughly half of the carbon dioxide that humans emit, while the rest stays in the air, said Glen Peters, a senior researcher at the CICERO Center for International Climate Research.

Where do carbon dioxide emissions go?

Source: Global Carbon Budget

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The chart shows the net amounts of carbon dioxide emissions absorbed by the atmosphere, land and ocean. The emissions are produced by burning fossil fuels, deforestation and other human activities. Data does not include 2023.

That one-half figure is an approximation. It varies from year to year depending on weather conditions and other environmental factors, resulting in the jagged lines you see in the chart above. For example, in a warm and dry year with many wildfires, the land may absorb less carbon dioxide than usual.

As the Earth warms further, climate scientists expect the land and the ocean to absorb a smaller share of carbon dioxide emissions, causing a larger share to end up in the air, said Doug McNeall, who studies these effects at Britain’s Met Office.

Xin Lan, the lead scientist responsible for NOAA’s global carbon dioxide measurements, referred to the natural absorption as a “carbon discount.”

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“We pay attention to it because we don’t know at which point that this discount is gone,” she said.

In addition to carbon dioxide, the levels of other potent greenhouse gases like methane and nitrous oxide are also on the rise, which further contribute to warming.

An exceptional year

2023 was unusually hot, both on land and in the ocean. (The oceans absorb over 90 percent of the excess heat caused by global warming.) It was the hottest year in over 170 years of record keeping, even exceeding scientists’ predictions.

One contributing factor to 2023’s extreme heat was El Niño, a climate pattern that tends to raise global temperatures. During El Niño, warm ocean currents in the Pacific Ocean cause warmer and drier weather in the tropics. This can lead to droughts that slow the growth of trees and increase the risk of wildfires.

When this happens, the land tends to absorb less carbon dioxide, and more of it ends up in the air. Several climate scientists said this may be why last year’s rise in carbon dioxide levels was substantially higher than in the years preceding it.

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Getting to zero

The current high emissions levels make the climate goal of limiting global warming to 1.5 degrees Celsius increasingly difficult to reach.

To limit warming to this threshold, experts say countries need to slam the brakes on global emissions and bring them down to near-zero in about a decade. And some are even considering more extreme technological solutions to help bridge the gap.

Even if global emissions were brought down to half of their current value, we would still continue to add carbon dioxide to the air, causing further warming.

“You need to bring them essentially down to zero in order to stop warming,” Mr. McNeall said.

How much more warming will occur depends on how long it takes for this to happen.

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On one hand, clean energy investments are booming, and renewable energy production is rising globally. But energy demand is also projected to rise, coal power plants are still being built, and some sectors of the economy — like construction and manufacturing — are harder to decarbonize, making the task ahead a steep challenge.

Even if the world exceeds the 1.5-degree threshold, “every fraction of a degree matters,” Mr. McNeall said.

“The closer that you can get to that threshold, the better.”

About the data

NOAA’s annual global carbon dioxide measurements are an average of thousands of measurements made near sea level at about 30 locations around the world. To account for local differences in humidity, measurements are made using dry air.

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Taylor Swift's new album is rife with breakup songs. Psychologists explain why we love them

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Taylor Swift's new album is rife with breakup songs. Psychologists explain why we love them

Perhaps never before have so many been so eager for something so steeped in heartbreak.

Taylor Swift‘s legions of devotees have eagerly anticipated her new album, “The Tortured Poets Department,” in hopes of gaining insight into her notoriously private six-year relationship with actor Joe Alwyn — particularly her perspective on its demise.

Swift delivers. In a track titled “Fresh Out the Slammer,” the 14-time Grammy Award winner sings of spending “Years of labor, locks and ceilings / In the shade of how he was feeling.” Another song called “So Long London” has her recounting that “I stopped CPR, after all it’s no use / Thе spirit was gone, we would never come to.”

“Songwriting is something that, like, actually gets me through my life, and I’ve never had an album where I needed songwriting more than I needed it on ‘Tortured Poets,’” Swift confessed to an audience in Melbourne, Australia, when her Eras tour played there in February.

Embracing a breakup album may seem like a macabre thing to do. But psychologists and cognitive scientists say songs about relationships gone bad actually can do listeners a lot of good.

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“When people have a romantic breakup, they feel very alone in their experience,” said David Sbarra, a professor of psychology at the University of Arizona who studies how marital separation and divorce affect health. “They feel very isolated and think that the unique individual circumstances that characterized their breakup are particularly terrible.”

A breakup song can change that, said Sbarra, who conducted a deep dive into the emotional authenticity of Olivia Rodrigo‘s lyrics about a doomed relationship on her debut album “Sour.”

“Songs play a powerful role in normalizing our experience, in making us feel that we are not this weird, unusual, distorted kind of person,” he said.

Indeed, almost everyone who has reached their late teens has lived through the demise of a romantic relationship and endured the gamut of emotions that accompany it.

“The songs function to affirm their emotions, validate them, remind the listener they are not alone,” said Bill Thompson, a psychologist at Bond University in Queensland, Australia, who studies why music is important to people. “The emotions associated with breaking up are universal. They are a natural part of being human — even if they are also painful.”

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Thompson said the concept of a love song — and by extension, a breakup song — may be written into our genes. Birds are known to serenade potential mates, while mice, humpback whales and other species use vocalizations to attract their partners.

“So among our ancestors, music might have played a role in mate selection and courtship,” he said. “It’s possible the prevalence of songs about love and courtship is a remnant of this ancestral function.”

The Sumerians of Mesopotamia devised a love song by around 2000 BCE, and scholars of Ancient Egypt have found love songs inscribed into pottery and written on sheets of papyrus. But it’s not clear when the first breakup song arose.

Why breakup songs caught on is less of a mystery, experts said.

“Breakups certainly inspire a rich broth of emotions,” said Arianna Galligher, a licensed clinical social worker and director of the Stress, Trauma and Resilience program at The Ohio State University Wexner Medical Center. “For a lot of people, listening to music helps them sort through their own emotional experience.”

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Sometimes a breakup song can be cathartic. Here, Taylor Swift shows her strength during a performance at SoFi Stadium in Inglewood in August 2023.

(Allen J. Schaben / Los Angeles Times)

Sadness is often the primary emotion in a breakup song. But it’s certainly not the only one.

The 10-minute version of Swift’s “All Too Well” evokes a range of strong feelings, including “sadness at the end of the relationship, nostalgia about the past romance, regret that the relationship failed, anger at being dumped, resentment that the boyfriend moved on to other young women, scorn at his unfaithfulness, and fear of being hurt again,” Paul Thagard, a philosopher and cognitive scientist at the University of Waterloo, writes in his forthcoming book “Dreams, Jokes, and Songs.”

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“I think it is a fabulous song,” Thagard said in an interview. “The reason it’s such a fabulous song is that it manages to convey a lot of different emotions.”

There’s no rule that says the emotions in a breakup song have to be negative. If a relationship was a poor fit — or even toxic — it’s appropriate to celebrate when it comes to an end, Galligher said.

Likewise, a breakup song suffused with sadness can resonate with a listener in a rock-solid relationship who is coping with another kind of loss.

“Sadness is not exclusive to breakups,” Galligher said. “Sometimes it can be helpful to listen to a song that is ostensibly about a breakup, but it helps you tap into something inside of you that knows sadness.”

She recalled a time that Adele’s “Someone Like You” came on the radio as she was driving to a memorial service.

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“I was in a perfectly functional relationship, very happily coupled, and I found myself tapping into the song’s sadness and grief related to the loss of my friend,” she said. “It was really helpful to be able to access those emotions.”

When a breakup is fresh and the pain is raw, a song can serve as “a virtual empathetic friend” by affirming and validating a listener’s emotions, helping them process their feelings, and reminding them they’re not alone, Thompson said.

“The advantage is that you won’t get unwanted advice,” he said. “Music is just there for you and supportive.”

Thagard agreed: “There’s no judgment coming from a song.” (Unless you’re one of the unlucky men who has broken Swift’s heart.)

In addition, binging on breakup songs can be part of “a habituation process” that reduces the intensity of feelings associated with a romantic split, Sbarra said. Some people may find that necessary before they’re ready to talk about their breakup with another person.

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“Sometimes folks need to spend a little time reflecting on their own feelings,” Galligher said. “Having a little bit of solitude to be introspective can be really beneficial, and then you seek the connection with others.”

Yet for all that breakup songs have to offer, it’s still possible to have too much of a good thing. Studies have found that listening to sad music can make sad people feel even sadder by prompting them them to dwell on their sadness.

“You do have to take your temperature about whether this is ultimately helping you or hurting you,” Sbarra said.

That said, listening to breakup songs can be a healthy way of distancing oneself from a painful event.

“It’s not you,” he said. “It’s Taylor Swift.”

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