Climate Change Warps Brains in the Womb, Scientists Discover

Welcome back to the Abstract! 

This week, it’s time for a walk in the woods. These particular woods have been dead and buried for centuries, mind you, but they still have a lot to say about the tumultuous events they experienced across thousands of years.

Then: exposure to climate change starts in the womb; CYBORG TADPOLES; get swole with this new dinosaur diet; the long march of an ancestral reptile; and, finally, pregaming for science. 

The saga of the sunken cypress 

Napora, Katharine et al. “Subfossil bald cypress trees suggest localized, enduring effects of major climatic episodes on the Southeast Atlantic Coast of the United States.” Proceedings of the National Academy of Sciences.

For thousands of years, a forest filled with bald cypress trees thrived in coastal Georgia. But climate shifts caused by volcanic eruptions and a possible comet impact wreaked havoc on this environment, eventually leading to the death of these ancient woods by the year 1600.

Now scientists have exhumed dozens of the magnificent trees, which were buried at the mouth of the Altamaha River for centuries. The dead trees are well-preserved as subfossils, meaning they are only partially fossilized, allowing researchers to count tree rings, conduct radiocarbon dating, and reconstruct the epic tale of this long-lived grove.

“This is the largest intact deposit of subfossil Holocene cypress trees ever analyzed in the literature from the Southeast United States…with specimens spanning almost six millennia,” said researchers led by Katharine Napora of Florida Atlantic University in their study. 

In ideal conditions, bald cypress trees can live for millennia; for instance, one tree known as the Senator in Longwood, Florida was about 3,500-years-old when it died in a 2012 fire. But Napora’s team found that their subfossil trees experienced a collapse in life expectancy during the Vandal Minimum (VM) environmental downturn, which began around 500 CE. Trees that sprouted after this event only lived about half as long as those born before, typically under 200 years. 

Study authors Katharine Napora and Craig Jacobs with an ancient cypress tree near the Georgia coast. Image: Florida Atlantic University

The reasons for this downturn are potentially numerous, including volcanic eruptions and a possible comet strike. The researchers say that tree-ring evidence shows “a reduction in solar radiation in 536 and 541 to 544 CE, likely the consequence of a volcanic dust veil…Greenlandic ice cores also contain particles rich in elements suggesting dust originating from a comet, dating to 533 to 540 CE.”

The possibility that a comet struck Earth at this time has been debated for decades, but many scientists think that volcanic eruptions can account for the extreme cooling without invoking space rocks. In any case, the world was rocked by a series of unfortunate events that produced a variety of localized impacts.This Georgian tree cemetery presents a new record of those tumultuous times which “speaks to the long-term impacts of major climatic episodes in antiquity” and “underscores the vulnerability of 21st-century coastal ecosystems to the destabilizing effects of large-scale climatic downturns,” according to the study.

In other news…

PSA: climate risks begin before you’re born 

DeIngeniis, Donato et al. “Prenatal exposure to extreme ambient heat may amplify the adverse impact of Superstorm Sandy on basal ganglia volume among school-aged children.” PLOS One.

In addition to disrupting long-lived trees, climate change poses a threat to people—starting in the womb. A new study tracked the brain development of children whose mothers endured Superstorm Sandy while pregnant, revealing that prenatal exposure to extreme weather events affect neural and emotional health.

“Prenatal exposure to Superstorm Sandy impacted child brain development,” said researchers led by Donato DeIngeniis of the City University of New York. The team found that a group of 8-year-old children whose mothers experienced the 2012 disaster while pregnant had noticeable differences in their basal ganglia, a brain region involved in motor skills and emotional regulation. 

Exposure to both the hurricane and associated extreme heat (defined as temperatures above 95°F) was linked to both a larger pallidum and smaller nucleus accumbens, both subregions of the basal ganglia, compared to unexposed peers. The findings hint at a higher risk of emotional and behavioral disruption, or other impairments, as a consequence of exposure in the womb, but the study said more research is necessary to confirm those associations. 

“Extreme weather events and natural disasters are projected to increase in frequency and magnitude. In addition to promoting initiatives to combat climate change, it is imperative to alert pregnant individuals to the ongoing danger of exposure to extreme climate events,” the team said.

Here come the cyborg tadpoles

Sheng, Hao, Liu, Ren, Li, Qiang et al. “Brain implantation of soft bioelectronics via embryonic development.” Nature.

Scientists have a long tradition of slapping sensors onto brains to monitor whatever the heck is going on in there. The latest edition: Cyborg tadpoles. 

By implanting a microelectrode array into embryonic frogs and axolotls, a team of researchers was able to track neural development and record brain activity with no detectable adverse effects on the tadpoles.

The cyborg tadpoles in question. Image: Liu Lab / Harvard SEAS

“Cyborg tadpoles showed normal development through later stages, showing comparable morphology, survival rates and developmental timing to control tadpoles,” said researchers co-led by Hao Sheng, Ren Liu, and Qiang Li of Harvard University. “Future combination of this system with virtual-reality platforms could provide a powerful tool for investigating behaviour- and sensory-specific brain activity during development.” 

The future didn’t deliver personal jetpacks, but we may get virtual-reality tours of amphibian cyborg brains, so there’s that. 

We finally know for certain what sauropods ate 

Poropat, Stephen F. et al. “Fossilized gut contents elucidate the feeding habits of sauropod dinosaurs.” Current Biology.

Once upon a time, a long-necked sauropod dinosaur from the Diamantinasaurus family was chowing down on a variety of plants. Shortly afterward, it died (RIP). 100 million years later, this leafy last meal has now provided the first direct evidence that sauropods—the largest animals ever to walk on land—were herbivores. 

Fossilized ferns, conifers, and other plants were found in the Australian Diamantinasaurus cololite. Image: Stephen Poropat

“Gut contents for sauropod dinosaurs—perhaps the most ecologically impactful terrestrial herbivores worldwide throughout much of the Jurassic and Cretaceous, given their gigantic sizes—have remained elusive,” said researchers led by Stephen Poropat of Curtin University. “The Diamantinasaurus cololite (fossilized gut contents) described herein provides the first direct, empirical support for the long-standing hypothesis of sauropod herbivory.”

Scientists have long assumed that sauropods were veggie-saurs based on their anatomy, but it’s cool to finally have confirmation by looking in the belly of this beast. 

Life finds a way through the “dead zone”

Flannery-Sutherland, Joseph et al. “Landscape-explicit phylogeography illuminates the ecographic radiation of early archosauromorph reptiles.” Nature Ecology & Evolution.

Birds, crocodiles, and dinosaurs are all descended from an ancestral lineage of reptiles called archosauromorphs. These troopers managed to survive Earth’s most devastating extinction event, called the end-Permian or “Great Dying,” a global warming catastrophe that wiped out more than half of all land animals and 81 percent of marine life some 250 million years ago.

Children of the archosaurs, chillin’. Image: Timothy A. Gonsalves

Now, paleontologists have found clues indicating how they succeeded by reconstructing archosauromorph dispersal patterns with models of ancient landscapes and evolutionary trees. The results suggest that these animals endured 10,000-mile marches through “tropical dead zones.”

These archosauromorph “dispersals through the Pangaean tropical dead zone…contradict its perception as a hard barrier to vertebrate movement,” said researchers led by Joseph Flannery-Sutherland of the University of Birmingham. “This remarkable tolerance of climatic adversity was probably integral to their later evolutionary success.”

The science of spectator sports

Xygalatas, Dimitris et al “Route of fire: Pregame rituals and emotional synchrony among Brazilian football fans.” Proceedings of the National Academy of Sciences.

In Brazil, football fans participate in a pregame ritual known as the Rua de Fogo, or Street of Fire. As buses carrying teams arrive at the stadium, fans greet the players with flares, smoke bombs, fireworks, flags, cheers, and chants.

Now, scientists have offered a glimpse into the ecstatic emotions of these crowds by enlisting  17 fans, including a team bus driver, to wear heart rate monitors in advance of a state championship final  between local teams. The results showed that fans’ heart rates synced up during periods of “emotional synchrony.” 

“We found that the Rua de Fogo ritual preceding the football match exhibited particularly high levels of emotional synchrony—surpassing even those observed during the game itself, which was among the season’s most important,” said researchers led by Dimitris Xygalatas of the University of Connecticut. “These findings suggest that fan rituals play important roles in fostering shared emotional experiences, reinforcing the broader appeal of sports as a site of social connection and identity formation.”

Wishing everyone an emotionally synchronous weekend! Thanks for reading and see you next week.