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NASA images reveal “ghost forests” in Florida

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NASA images reveal “ghost forests” in Florida


NASA and U.S. Geological Survey (USGS) satellite images have unveiled a concerning phenomenon in Florida: the emergence of “ghost forests” in the state’s mangrove ecosystems.

These watery graveyards of once-thriving trees are a product of mangrove forests’ increasing vulnerability to intensifying storms and environmental change.

Mangroves are vital to the Florida Everglades. Known for their picturesque, half-submerged roots that create natural tunnels for kayakers, these trees also serve essential ecological and environmental functions.

Mangroves stabilize coastlines, buffer against erosion, store carbon and provide critical shelter for marine life.

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Florida is estimated to have 600,000 acres of mangrove forests, though their distribution has changed in recent decades mostly as a consequence of human activity, according to the state’s Department of Environmental Protection.

Although mangroves are renowned for their resilience, including their ability to withstand flooding, the recent findings published in the journal Remote Sensing of Environment revealed that stronger and more frequent hurricanes are overwhelming this natural adaptability.

Using decades of Landsat satellite data spanning from 1999 to 2023, researchers identified troubling patterns in mangrove recovery following hurricanes. Unlike previous studies that typically focused on single events, this study paints a broader picture of how these forests respond to storms over time.

The team categorized mangrove conditions into four groups: healthy (unaffected by storms), disturbed (impacted by storms but recovered within a single growing season), recovering (requiring more than one season to recover) and declining (failing to recover and entering long-term decline).

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The aftermath of recent hurricanes revealed a sharp rise in the number of declining mangroves. These forests, unable to recover, often transition into “ghost forests,” where dead trees haunt the once bustling coastline.

“Our monitoring has shown a significant increase in the area of mangroves that have lost their natural recovery capacity following recent hurricanes, such as Irma in 2017 and Ian in 2022,” Zhe Zhu, a co-author of the study and a former member of the USGS–NASA Landsat science team said in a statement.

The Landsat-based maps from the study showed clear contrasts between mangrove recovery after hurricanes Wilma (2005) and Irma (2017) in the southern Everglades National Park bordering the Gulf of Mexico.

Mangrove condition map
Maps showing the condition of mangroves in the Florida Everglades, 2004–2017. The iconic trees and shrubs of the Florida Everglades are under increased stress due to more frequent, intense hurricanes.

Lauren Dauphin, using data from Yang, Xiucheng, et al. 2024/NASA Earth Observatory

While most mangroves recovered naturally after Wilma, a significant portion of mangroves impacted by Irma entered a long-term decline, turning into ghost forests.

“Comparing post-hurricane conditions in Florida revealed that the increased frequency and severity of disturbances are challenging mangrove resilience, potentially diminishing their ability to recover and sustain ecosystem functions,” the researchers wrote in the study.

A key innovation of this study was the use of a machine-learning algorithm to analyze satellite data, enabling continuous and detailed tracking of mangrove conditions. This approach provides an early warning system, helping land managers identify areas at risk before losses become irreversible.

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“Our research aims to provide an early warning system for mangrove decline, helping to identify areas at risk before irreversible loss occurs,” Zhu said.

The researchers plan to refine their algorithm to better differentiate between the drivers of mangrove change, such as extreme weather, rising sea levels or human activity. They also aim to expand the study to monitor mangroves globally.

“By identifying whether changes are driven by extreme weather events, rising sea levels, or human activities, we can provide more targeted insights for conservation and management strategies in a rapidly changing environment,” Zhu said.

Do you have a tip on a science story that Newsweek should be covering? Do you have a question about comets? Let us know via science@newsweek.com.

Reference

Yang, X., Zhu, Z., Kroeger, K. D., Qiu, S., Covington, S., Conrad, J. R., & Zhu, Z. (2024). Tracking mangrove condition changes using dense Landsat time series. Remote Sensing of Environment, 315, 114461. https://doi.org/10.1016/j.rse.2024.114461

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Florida

President Biden bans future oil and natural gas drilling off Florida’s coast

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President Biden bans future oil and natural gas drilling off Florida’s coast



It is not yet known what effect this will have on the state’s decision to allow a permit for an exploratory oil well along the Apalachicola River.

President Biden on Monday banned future oil and natural gas drilling and leasing off of Florida’s coasts.

His executive actions add 334 million acres of the Atlantic coast from Canada to the southern tip of Florida and the east coast of the Gulf of Mexico for a total of over 625 million acres of protected waters surrounding the United States.

While there are no active leases off the Atlantic coast, Florida’s beaches on the east coast of the Gulf of Mexico have previously been impacted by oil spills from drilling in the gulf, most notably from BP’s Deepwater Horizon oil drilling rig in 2010.

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“President Biden has determined that the environmental and economic risks and harms that would result from drilling in these areas outweigh their limited fossil fuel resource potential,” the White House’s press release says.

“With these withdrawals, President Biden is protecting coastal communities, marine ecosystems, and local economies – including fishing, recreation, and tourism – from oil spills and other impacts of offshore drilling.”

It’s not clear, however, what effect this will have on the Florida Department of Environmental Protection’s decision to allow a permit for an exploratory oil well along the Apalachicola River, which has been heavily criticized by drilling opponents and lawmakers.

It’s also not clear if the ban will have staying power. Trump is vowing to “unban it immediately.”

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A spokesperson for the Trump administration said Biden’s move was “disgraceful” and was “designed to exact political revenge on the American people who gave President Trump a mandate to increase drilling and lower gas prices.”

“Rest assured, Joe Biden will fail, and we will drill, baby, drill,” wrote Trump spokesperson Karoline Leavitt in a post on X.

The ban also includes the Pacific off the coasts of Washington, Oregon and California, and additional portions of the Northern Bering Sea in Alaska.

In Florida, the Apalachicola River is considered to be one of the least polluted, least developed and resource-rich bodies of water in the United States, according to the United Nations Educational, Scientific, and Cultural Organization (UNESCO).

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Critics of the state’s plan to allow exploratory drilling want Gov. Ron DeSantis to block Clearwater Land & Minerals from drilling through a lime rock pad north of Dead Lakes in Calhoun County.

Democratic state Reps. Allison Tant and Gallop Franklin, and Republican state Sen. Corey Simon had harsh words for the proposal when it came to light last year.

“It is unconscionable that efforts to drill for oil are happening at the same time that we are fighting for the revitalization of the Apalachicola Bay,” Simon said in a statement released by the Florida Senate.  

Requests for comment from DeSantis’ office and U.S. Sen. Rick Scott were pending as of midday Monday.

Ana Goñi-Lessan is the State Watchdog Reporter for USA TODAY – Florida and can be reached at AGoniLessan@tallahassee.com

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1850s plant info unearthed, helping Florida scientists untangle climate change

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1850s plant info unearthed, helping Florida scientists untangle climate change


An email from the Smithsonian Institution popped up in Theresa Crimmins’ inbox over a December break about two years ago.

Crimmins was researching phenology — the study of how plants and animals respond to seasonal changes — for a book chapter she was writing, and had requested whatever information the institution could find.

To the average person, the document the Smithsonian had unearthed would have been unremarkable.

It is a nearly 600-page, 19th-century report containing a dizzying amount of entries spanning from 1851 to 1859.

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This data was highly unusual in its detail. Most records like it are generic and only cover small regions. This one contained thousands of entries spanning over 200 species across North America, including exact blooming dates, when fruit ripened and when different animals migrated into an area.

Crimmins, the director of the USA National Phenological Network, reached out to colleagues across the country to see if they knew about it.

It was unlike any document they’d seen before. And it apparently had never been utilized.

Comparing the entries to data from today could draw an unprecedented picture of how climate change has affected when plants bloom over the last century and a half.

So Crimmins teamed with Robert Guralnick, curator of biodiversity informatics at the Florida Museum of Natural History in Gainesville, and researchers from the University of Florida to do just that. They released a study in October with their findings.

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What they found was a vastly different natural world caused by climate change — one where some species today bloom nearly a month earlier than they did in the 1850s.

When the timing of species that rely on each other shift around, it can create an unsteady ripple through ecosystems — causing a myriad of unforeseen consequences like less pollination or food scarcity.

“I think what this is helping us understand is that we are very much in a period of active change,” Crimmins said, “and really things are drifting earlier.”

The 19th century document was made under the direction of the United States Patent Office and the Smithsonian Institution, according to the Library of Congress. The document would become vital in testing a new framework for 21st century phenological predictions, according to researchers. [ The Library of Congress ]

How century old data is informing the future

The Smithsonian Institution in the 1850s recruited hundreds of citizen scientists across the nation to track when they saw plants bud or grow leaves.

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At the time, Florida had been a state for only six years.

The first Florida entry was for “Alligator,” a city that would later be renamed Lake City in Columbia County. Edward Ives recorded the first leaves growing on a “Red or Soft Maple.”

Another contributor from “Cedar Keys” in Levy County was named Augustus Steele.

Steele is likely the same man who helped found Hillsborough County years prior, according to a Tampa Tribune article.

Vital as the data would turn out to be, the document went unpublished for years because of printing scarcity during the American Civil War.

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In 2023, Crimmins was tasked with contributing a chapter for a third edition of a book on phenology. The book’s previous edition briefly mentioned a phenological data collection network in the 1850s, but it was merely a footnote.

It was an opportunity, Crimmins said, to dig deeper. Still, she was floored when she received the full document from the Smithsonian and saw its extraordinary detail.

“I was like ‘Oh my gosh, that’s cool,‘” Crimmins said. “When you have actual direct observations like that, you can directly compare them to the same species and the same events in the present day.”

The project mirrors the work of the USA National Phenological Network. The group, created in 2007, uses a formal tracking program that collects and monitors plant cycles with the help of citizen scientists across the country.

A formula for the future

Scientists don’t know precisely how climate change influences plant cycles.

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Researchers know plants are sensitive to cues, like temperatures, but why flowering and leafing varies across species remains a mystery.

As the planet warms from human-caused climate change, these cycles are further muddied.

Guralnick and other colleagues from the University of Florida, including a small group of student interns, spent weeks scraping data from the 19th-century document.

Beyond comparing dates of blooming, they wanted to create a better framework to predict how species respond to climate change.

The October study outlines a revamped formula for predicting when plants will grow buds or leaves by adding an extra variable to how phenological predictions are typically made.

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They found that with the added variable, their predictions more accurately aligned with how climate change has affected nature over the past century and a half.

With climate change, not all species are changing in the same way, or in the same direction, Crimmins said.

Are pollen allergies in Florida worsening? Is climate change to blame?

The northeastern part of the country is warming faster than the southeast, for example.

While the October study does not use Florida records (researchers used data as far south as around Georgia), there are some takeaways for the state.

Guralnick said species in the southeast are more sensitive to phenological cues, like temperature or rainfall changes.

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Had warming in the south occurred at the same rate as the north, southerly plant cycles would be more affected.

“I think it’s neat,” Guralnick said. “It talks about these different layers, and so now we can predict if more warming happens here over time, we would see stronger phenological responses to that warming.”

The image shows a Pink Azalea from the Florida Museum of Natural History. The flower was observed in the 19th century report commissioned by the Smithsonian Institute.
The image shows a Pink Azalea from the Florida Museum of Natural History. The flower was observed in the 19th century report commissioned by the Smithsonian Institute. [ The Florida Museum of Natural History ]

When a plant blooms earlier than expected, that’s where mismatches among species that depend on each other can happen, Crimmins said.

If a plant buds before a pollinator arrives, the plant may not be able to reproduce as widely, and it could cause the pollinator’s population to decline.

Crimmins said the phenology network is a way to show how the natural world is changing and document it.

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“There’s a lot people can do just with the data coming … but when we can also put into the context of what was happening a hundred or more years ago, with this particular data set, it’s even more powerful,” Crimmins said.

“It helps us to tell an even more robust story of how things have changed.”



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Brandon Butler: Florida a great escape for outdoor enthusiasts

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Brandon Butler: Florida a great escape for outdoor enthusiasts


Driving north from southwest Florida, my progress was marked by steadily declining temperatures. Leaving behind sunshine and 75-degree days for snow, sleet, and single digits was a questionable choice at best. Days spent at the beaches of Siesta Key, golfing, hiking in a wildlife-rich state park, and eating seafood dinners outside sure beats shoveling snow and waiting on the dreary days to depart.



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