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How a water scientist hopes to save California habitats that could be pumped dry

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How a water scientist hopes to save California habitats that could be pumped dry

California is recognized as one of the world’s hotspots of biodiversity, with more species of plants and animals than any other state. And a significant number of the state’s species, from frogs to birds, live in habitats that depend on groundwater.

These rich ecosystems — including spring-fed streams, wetlands, riparian forests and oak woodlands — are vulnerable to declines in groundwater levels. In areas where unchecked pumping from wells severely depletes aquifers, once-thriving wetlands and forests can dry up and die.

Spotting threats to vulnerable natural areas has become a mission for Melissa Rohde, a hydrologist who has spent years analyzing satellite data and water levels in wells to come up with strategies for preventing ecosystems from being left high and dry.

“Nature has been getting the short end of the stick. It basically gets whatever is left behind, which oftentimes is not enough,” Rohde said. “How do we ensure that these ecosystems are protected?”

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More than 300 species of birds have been seen at Kern River Preserve.

(Robert Gauthier / Los Angeles Times)

California is the only state with a groundwater law that includes provisions intended to protect groundwater-dependent ecosystems. But the law, adopted in 2014, gives considerable leeway to local agencies in developing water management plans that prevent “significant and unreasonable adverse impacts.”

When Rohde and other scientists examined the local plans for parts of the state that fall under regulation, they found only about 9% of groundwater-dependent ecosystems are adequately protected, while the remaining 91% are vulnerable.

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When they looked at the entire state, they determined only 1% of the ecosystems are sufficiently protected under measures adopted to date.

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Rohde has been focusing on finding ways to change that, in California and around the world.

Often working at home, she has pored over satellite data to spot decreases in vegetation greenness during drought, a telltale sign of die-off caused by declining aquifer levels. And she has analyzed how different types of trees, including willows, cottonwoods and oaks, fare when water levels fall depending on the depth of their roots.

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Rohde and other researchers recently published a study outlining how California can set targets for maintaining groundwater levels — based on a formula including the type of vegetation, local water data and satellite imagery — to ensure the plants that anchor each ecosystem will be able to reach water and survive during dry times.

Cattle graze at the Kern River Preserve.

Cattle graze at the Kern River Preserve.

(Robert Gauthier / Los Angeles Times)

“If we don’t have groundwater levels that are able to support these diverse native vegetation ecosystems, then basically we run the risk of losing that important habitat for a lot of our threatened and endangered species,” Rohde said. “When you play around with keeping groundwater levels too deep to support the habitat, then you could lose species, and then that’s irreversible. The consequences can be severe.”

In California’s Mediterranean climate, trees, shrubs and the species they support are naturally adapted to drought. But excessive pumping from wells can push habitats beyond ecological limits by depleting the sources that sustain them.

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With humanity’s heating of the planet intensifying droughts, the strains affecting these ecosystems continue to grow.

Already, California has lost the vast majority of its original wetlands to development, water diversions and agriculture. To avoid losing what remains, Rohde said, the state needs “a precautionary and preventative approach that can ensure that these ecosystems can withstand the intensification of droughts in climate change.”

During a recent visit to Kern County, Rohde and several conservation specialists walked in the shade through a lush forest of cottonwood trees near the south fork of the Kern River, visiting a nature preserve she had previously seen only in satellite images.

Scientist Melissa Rohde stands in a riparian forest.

Scientist Melissa Rohde visits a riparian forest at the Kern River Preserve.

(Robert Gauthier / Los Angeles Times)

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At the edge of a clearing, she came upon the bare, sunbleached skeletons of dead trees.

She said satellite data had revealed that parts of the forest died along this part of the Kern River during the drought between 2012 and 2016.

“That’s because the groundwater levels rapidly declined,” Rohde said.

After that die-off, she said, groundwater levels rebounded in the area, and the native vegetation has been growing back.

A sign reads "Kern River Preserve" on a gate, with trees in the background.

The Kern River Preserve protects the riparian ecosystem along the south fork of the Kern River.

(Robert Gauthier / Los Angeles Times)

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It helps that this forest is protected as part of the Kern River Preserve, which is managed by the National Audubon Society, and that some nearby farmlands have been retired and converted to conservation lands over the years.

The preserve’s managers, working with the organization Ducks Unlimited, have also restored an expanded wetland by diverting water from the river and flooding a section of pastureland where cattle used to graze.

The wetland attracts birds, such as coots and tricolored blackbirds, and also recharges the aquifer that the roots of cottonwoods and willows tap into.

Scientists and conservation specialists stand on a rock formation overlooking a wetland.

Scientist Melissa Rohde, left, and conservation specialists from Ducks Unlimited and the Audubon Society, including Reed Tollefson, right, stand on rocks overlooking a wetland at the Kern River Preserve.

(Robert Gauthier / Los Angeles Times)

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The 3,300-acre preserve has expanded as adjacent alfalfa fields have been purchased and agricultural wells have been shut down, said Reed Tollefson, the preserve’s manager. These efforts have helped protect a refuge for birds including willow flycatchers and yellow-billed cuckoos.

As he pointed to several dead trees poking from the living cottonwoods, he said protecting the forest from groundwater pumping and climate change will require additional effort.

“I think it’s tenuous,” he said. “We’ve got more work to do to try and really sustain this.”

The dead trees that have appeared here and elsewhere in California over the past decade represent the sort of die-off that water managers need to focus on preventing, Rohde said.

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“It has to be an intentional practice of setting thresholds, monitoring, using satellite data or other scalable means to measure the impacts, in order to make sure that we are not allowing this to happen on a wider scale,” she said. “From a biodiversity perspective, it’s absolutely critical.”

Rohde said she felt hopeful seeing the forest rebounding and much greener than it was several years ago, with many young trees coming up.

Some other parts of California haven’t fared nearly as well.

One rainy day last month, Rohde visited an area along the Santa Clara River in Ventura County where several hundred acres of willows and cottonwoods dried up and died during the drought in the mid-2010s.

When groundwater pumping by farms and communities caused aquifer levels to fall, many trees died along the river near the city of Fillmore.

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“We saw this catastrophic drop in groundwater at this site,” Rohde said.

She visited the area with a research colleague and two managers from The Nature Conservancy. They stood on a gravel road next to a lemon grove, checking on what remained of the forest.

Scientist Melissa Rohde stands beside tall reeds.

Scientist Melissa Rohde stands in a thicket of arundo, an invasive reed that has proliferated along parts of the Santa Clara River in Ventura County. There are ongoing efforts to remove the nonnative reeds in the area.

(Brian van der Brug / Los Angeles Times)

Where native trees died, an explosion of invasive reeds has taken over. The nonnative reeds, called arundo, have grown into thickets more than 20 feet tall. And unlike willows, Rohde said, arundo offers little value as habitat for birds.

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“When we had that massive die-off, and the groundwater levels remained deep, there was no way for the native vegetation to regenerate,” she said. “But arundo is extremely efficient at extracting soil moisture. And so it was able to outcompete the native vegetation.”

She said efforts to prevent this sort of habitat degradation should be prioritized.

When managers of local agencies set goals for maintaining groundwater levels, she said, they can tailor targets to the type of vegetation — whether there are cottonwood trees, with roots averaging about 9 feet long, or oaks, with roots that average nearly 30 feet but can grow much deeper.

Her colleague Michael Bliss Singer said when native trees are ravaged by multiple years of low water levels, they will start losing leaves and then dropping branches.

In one study, Singer and others documented a “brown wave” of trees drying along the Santa Clara River between 2012 and 2016 — a loss they saw in satellite images.

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A man looks out on a muddy river.

Scientist Michael Bliss Singer looks out over the Santa Clara River in Ventura County.

(Brian van der Brug / Los Angeles Times)

“It’s completely transformed the ecosystem here,” said Singer, a professor at Cardiff University in Wales who is also a researcher at UC Santa Barbara.

When plants die off like this and don’t recover, it’s a symptom of an ecosystem in decline. To prevent more of these losses in an era when climate change is driving more severe droughts, Singer said, it’s crucial to “come up with creative solutions for the worst-case scenario.”

Rohde has found in her research, however, that most local groundwater plans in California haven’t adequately accounted for climate projections.

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Previously, Rohde did other types of climate research, including a stint in Antarctica in 2010, where she was part of a drilling team collecting ice cores. From that experience, Rohde said she realized that “I didn’t want to spend my career convincing people that climate change was an issue; I wanted to do something about it.”

She wore a faded cap with an Antarctica map, a memento of that trip. Rohde said her recent work is motivated by concerns about the climate crisis and biodiversity, as well as a conviction that proactive steps to protect ecosystems can make a difference.

“I have two young kids. I really want to make sure that I’m doing the best thing that I can to ensure a sustainable future for them, where they can access nature,” Rohde said.

A man holds binoculars as he observes a wetland.

E.J. Remson, a senior project director for The Nature Conservancy, surveys a wetland along the Santa Clara River in Ventura County.

(Brian van der Brug / Los Angeles Times)

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“Often groundwater is out of sight, out of mind,” she said. “We don’t measure it, we don’t understand it and we misuse it. And we need to make sure that we are managing groundwater so that it is supporting us, and making sure that we have a sustainable future.”

Rohde now works as an independent scientist. Previously, as a researcher for The Nature Conservancy, she helped write an atlas of threatened and endangered species that rely on groundwater.

California’s groundwater-dependent ecosystems lie not only along streams, but also in habitats such as mountain meadows, coastal redwood forests and mesquite bushes among desert sand dunes. The species they support range from tiger salamanders to desert pupfish, and from songbirds to mammals such as ground squirrels and bighorn sheep.

“The risks are high when species are on the verge of extinction,” Rohde said.

Rohde and other scientists have found that ecosystems sustained by groundwater are under threat worldwide. Some of the few regions that have measures intended to protect them, she said, include Australia, the European Union and California.

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Still, even with California’s groundwater regulations and endangered species laws, Rohde said, “we continue to miss the mark in actually protecting them.”

Rohde said state officials should give local water agencies clear direction to ensure they’re using science-based methods to safeguard ecosystems in their state-mandated plans. She said agencies can now use the approaches scientists have outlined to map strongholds of biodiversity and set targets for maintaining aquifer levels.

“It’s very attainable,” she said. “Now, it’s just basically up to political will, or enforcement by the Department of Water Resources, to ensure that that happens.”

Walking in the rain at the Santa Clara River Preserve, Rohde followed her former Nature Conservancy colleagues Peter Dixon and E.J. Remson on a trail through a stand of healthy trees.

A man in a hooded rain jacket hikes along a soaked trail.

Peter Dixon, a project manager with The Nature Conservancy, walks on a trail through the riparian forest at the Santa Clara River Preserve.

(Brian van der Brug / Los Angeles Times)

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They stood on the banks of the fast-flowing river, watching the muddy water churn past.

In the summer and fall, this part of the river usually dwindles to a trickle.

And during the next drought, when the river dries up, the forest will depend on the same groundwater that nearby communities and farms also use.

If the water needs of this and other ecosystems aren’t prioritized, Rohde said, vital habitats will suffer.

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“We need to be deliberate about the planning, and ensuring that they get their fair share,” she said. “Their existence is potentially imperiled if we don’t act.”

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Judge halts ban on syringe programs as El Dorado County legal battle continues

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Judge halts ban on syringe programs as El Dorado County legal battle continues

El Dorado County cannot enforce its ban on programs that hand out clean syringes as a legal battle continues between the county and the California Department of Public Health, a Superior Court judge has ruled.

Judge Gary S. Slossberg granted a preliminary injunction to prevent El Dorado County from enforcing an ordinance that makes it unlawful to operate syringe programs in its unincorporated areas.

The judge said he was not weighing in on the heated arguments for or against syringe programs, which provide sterile needles to people who use drugs, but whether the Department of Public Health had a “reasonable probability” of prevailing in its argument that the county ordinance clashes with state law.

Friday’s decision does not end the courtroom dispute over whether the ban passed by the El Dorado County Board of Supervisors was preempted by state law, as public health officials have argued, or opposing claims by county officials that the syringe program was improperly approved by the state. Slossberg said Friday that the preliminary injunction is meant to remain in place pending a later trial.

The Department of Public Health filed suit against El Dorado County and its county seat of Placerville this year contending that their bans on syringe programs defied the state health and safety code.

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The state health department first authorized the nonprofit Sierra Harm Reduction Coalition to operate a syringe program in the county four years ago. State officials have long endorsed such programs as a proven way to prevent HIV and hepatitis C from running rampant as people share contaminated syringes.

California law gives the public health agency the power to approve syringe programs anywhere that deadly or disabling infections might spread through used needles, “notwithstanding any other law.”

Local bans on syringe programs have nonetheless sprung up across California as city and county officials argue that handing out free syringes does more harm than good. El Dorado County leaders passed their rule in December, which was followed in February by a similar ordinance in Placerville.

The lawsuit lodged by the California Department of Public Health drew objections from El Dorado County leaders: Earlier this year, Dist. Atty. Vern Pierson called it “madness” and argued that California officials were “seeking to impose the normalization of hardcore drug use.”

In a cross-complaint filed against the Department of Public Health, the county said that the syringe program approved by the state had caused “profound nuisance and public safety impacts,” including a “drastic increase in discarded needles,” and that overdoses had risen since it started.

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The county said in a legal filing that since the ban went into effect, “there has been a reduction of syringe waste, decreased incidents of public nuisance, and a resulting reduction of the burdens on law enforcement.”

It also accused the public health department of failing to follow state requirements when it approved the syringe program.

The judge did not weigh in on the cross-complaint lodged by El Dorado County at the Friday hearing. In a court filing, California officials said studies show that syringe programs provide important resources for needle disposal and play a crucial role in preventing overdoses. They credited the Sierra Harm Reduction Coalition with handing out thousands of boxes of Narcan, a brand of naloxone, a medication that reverses the effects of an opioid overdose.

The Department of Public Health argued in a legal filing that stopping the syringe program would be likely to ramp up HIV and hepatitis C infections among people who use drugs, increasing state costs for their care; lead to more deaths from drug overdoses; and reduce access to options for syringe disposal, among other harmful effects.

Because of the bans, “our most vulnerable, stigmatized, and marginalized community members are actively being denied lifesaving interventions,” Sierra Harm Reduction Coalition interim executive director Shilo Jama said in a court filing.

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Slossberg said that although he was preventing the El Dorado County ordinance from being enforced, the county might have other mechanisms to address nuisance issues that were not addressed by the decision.

Pierson, the district attorney, said in a statement Friday that “we will propose narrowing the ordinance” in response to comments made by the judge.

The California Department of Public Health said in a statement that it was “pleased with the court’s decision that upholds that state’s role in protecting the public’s health while this case proceeds.”

The Friday ruling applies only to the ordinance passed by El Dorado County. Attorney Mona Ebrahimi, who represents the city of Placerville, said a hearing involving the city had been postponed.

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This one thing may derail your shot at healthy aging, scientists say

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This one thing may derail your shot at healthy aging, scientists say

Before you settle in to binge the new season of “The Bear” or watch Team USA go for the gold at the Paris Olympics, think twice about the amount of time you spend on the couch in front of the TV. Your future self may thank you.

A new study by Harvard researchers links the popular pastime of sitting and watching television to the likelihood of reaching one’s senior years in a state of good health: the more time spent doing the former, the lower the odds of achieving the latter.

The problem doesn’t seem to be with sitting in general. After controlling for a variety of risk factors such as diet quality and smoking history, the researchers found no relationship between time spent in a chair at work and the chances of aging well. Ditto for sitting in cars or at home doing something besides watching TV, such as reading, eating meals or paying bills.

Yet for every additional two hours spent in front of the boob tube, a person’s chance of meeting the researchers’ definition of healthy aging declined by 12%, according to their study published this week in JAMA Network Open.

That does not bode well for the United States, where 62% of adults between the ages of 20 and 64 say they watch TV for at least two hours a day, as do 84% of senior citizens.

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The findings are based on data from more than 45,000 women who participated in the Nurses Heath Study. All of them were at least 50 years old and had no major chronic diseases back in 1992, when they answered a slew of questions about their health and what they did all day.

For instance, the nurses were asked how much time they spent standing or walking around at work or at home. They were asked about various types of exercise, including jogging, swimming laps, playing tennis and doing yoga. They were asked if they mowed their own lawns.

And they were asked how many hours they spent doing all kinds of sitting.

A couple watches a movie on TV at their home in Norwalk while sharing a bowl of popcorn.

(Francine Orr / Los Angeles Times)

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You might not be surprised to learn that the most popular type of sitting was sitting while watching television. More than half of the women — 53% — said they watched between six and 20 hours of TV a week. (The median among this group was around 15.4 hours per week.) Another 15% of the women said they watched between 21 and 40 hours of TV each week, and 2% watched even more.

The nurses were tracked for 20 years or until they died, whichever came first. By the end of the study period, 41% of them were still free of 11 major health conditions, including cancer, diabetes, heart failure, chronic obstructive pulmonary disease and multiple sclerosis. In addition, 44% of the nurses were in good mental health, 52% had no memory impairments and 16% had no physical impairments.

Only 8.6% of the women met all four of those criteria, which was what it took to achieve healthy aging.

On the whole, the women who watched more TV tended to be older, were more likely to be smokers or drinkers, consumed more calories and had higher body mass index scores than women who watched less TV. The more devoted TV watchers were also more likely to have high blood pressure and high cholesterol.

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Once the researchers accounted for these and a host of other differences, they found that the women who spent an hour or less each week sitting in front of the TV were the most likely to achieve healthy aging. Compared to them, women who watched TV for two to five hours per week were 9% less likely to be healthy agers; those who watched for six to 20 hours per week were 19% less likely; those who watched for 21 to 40 hours per week were 40% less likely; and those who watched for at least 41 hours a week were 45% less likely.

The researchers also found that replacing TV time with pretty much anything else — including sleep, for women who got no more than seven hours of shut eye per night — would increase their odds of healthy aging. The more vigorous the new activity, the bigger the boost.

Although the actual percentage of women who succeeded in healthy aging was low, the study authors estimated that another 61% of the women could have joined that rarefied group if they had done four things:

  • Spent at least three hours per day engaged in light physical activity at work.
  • Invested at least 30 minutes a day in moderate to vigorous physical activity.
  • Kept their weight in the normal range instead of being overweight or obese.
  • Limited their TV-watching time to less than three hours a day.

The study didn’t show that excess TV time caused any of the nurses to miss out on healthy aging, only that there was a significant inverse correlation between the two. Still, there’s good reason to suspect that their favorite sedentary behavior bore at least some of the responsibility.

Previous studies have linked prolonged sitting — especially while watching television — to a variety of health problems, including diseases like breast cancer, colorectal cancer, type 2 diabetes, cardiovascular disease and early death. (That particular study found that compared to sitting for less than three hours a day, sitting for at least twice that long was associated with a 17% increased risk of premature death for men and a 34% increased risk of premature death for women.)

But the researchers from Harvard’s T.H. Chan School of Public Health have taken things a step further, said Dr. I-Min Lee, an epidemiologist at Brigham & Women’s Hospital in Boston who studies how physical activity can prevent chronic diseases and extend life.

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“This study expands what we know because it looked at ‘healthy aging,’” said Lee, who was not involved in the study. “‘Health’ is not just the absence of disease; it includes dimensions of physical and mental health, function and well-being.”

All of the study subjects were women, but the biological mechanisms are likely to apply to men as well, Lee said. Even so, it would be good to actually test this relationship in men, as well as in people from a wider range of racial and ethnic backgrounds, she said. (The group of women in the original Nurses Health Study was overwhelmingly white.)

The youngest of the Baby Boomers are now turning 60, and the proportion of the U.S. population that’s at least 65 is projected to increase from roughly 17% today to nearly 21% in 2050, according to the U.S. Census Bureau.

“Population aging is an important public health issue,” the study authors wrote, and strategies to promote healthy aging “are urgently needed.”

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Column: The abortion pill is safe. Is your uterus?

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Column: The abortion pill is safe. Is your uterus?

Huge sigh of relief.

In a ruling that I happily admit surprised me, the Supreme Court on Thursday affirmed the obvious: Women should have the right to safe medication abortions.

But ladies, our uteri are not safe yet.

For now, in a unanimous decision, the justices have tossed a case that would have prevented the drug mifepristone from being used by women seeking to end pregnancies.

So mify, as the drug is commonly called, is safe. But this is far from the end of the MAGA war on women.

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Let’s be clear on this: The ruling wasn’t actually about the drug. It was about the folks who brought the suit, a bunch of doctors who really didn’t have much of a reason to keep millions of women from accessing care other than they didn’t like the care those women wanted.

That’s not actually a reason to sue, even by Samuel Alito and Clarence Thomas standards.

So this ruling is about “standing” and the fact that these docs didn’t have it. Already, antiabortion activists are lining up other cases with defendants whose legal footing is much more solid.

And the Supreme Court is hardly the only front in this war for women’s rights. Here’s three other ways the far-right wants to control female bodies:

First, “fetal personhood” has bubbled up as a scary push by the religious right.

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Alito hinted at this concept in the Dobbs ruling, which knocked out Roe vs. Wade, when he referred to an embryo as an “unborn human being.”

In Alabama, we saw this take greater life recently when state Supreme Court judges ruled that embryos created during in vitro fertilization should be considered protected human life (though the state Legislature for now has protected the procedure).

And this week, the Southern Baptist Conference, which speaks for more than 10 million Protestant Americans, announced it would now opposes IVF on those embryos-are-life grounds.

If courts do recognize the idea of fetal personhood, it would pave the way for abortion to be considered not just illegal, but murder. It would also give a state the right to police pregnant women in any way it deems necessary to protect the “unborn child.”

We are already seeing some states attempting to prosecute women for abortions under strict new abortion laws and dozens of states (such as Kansas) either have outright legal language broadly giving fetuses rights or language that edges right up to it. We are closer to this than you think.

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The second front on the war on women is contraception.

Though it seems insane and inane to most of us to forbid women from taking the pill or an emergency medication in the immediate aftermath of intercourse to prevent pregnancy, some folks do want to ban it as a form of abortion.

There is a logic to it. If all abortion is illegal, then anything affecting the embryo after conception is off limits.

Finally, there’s former President Trump.

I’ve written before about the Comstock Act, an obscure and angry old law that many speculated the Supreme Court justices might dredge up in this mifepristone case.

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That law (which is on the books, but not enforced) theoretically makes it illegal to mail anything that could be used in an abortion — so not just the medication. Hard-liners could argue that anything shipped to an abortion clinic to help it operate could be verboten, even latex gloves.

MAGA types are already floating the frightening notion that if Trump were elected, he could simply bypass courts and Congress and order his Department of Justice to enforce the Comstock Act — ending abortion access without technically ending abortion access.

This week, Trump send a recorded message to the Danbury Institute, an ultraconservative organization that has advocated for abortion to be prosecuted as homicide and called it “child sacrifice.”

He didn’t mention abortion, but there’s this:

“These are gonna be your years, because you’re gonna make a comeback like just about no other group,” he said. “I know what’s happening, I know where you’re coming from and where you’re going, and I’ll be with you side by side.”

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So while Thursday’s ruling is a welcome win in the fight to keep women equal, it’s a victorious battle.

The war continues.

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