Friday, January 17, 2025

 

MEXICO: How animals, people, and rituals created Teotihuacán



Discovery of nearly 200 animals remains is among the most abundant mass cases of animal sacrifices found in ancient metropolis




University of California - Riverside

Teotihuacan, Mexico 

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Nawa Sugiyama, assistant professor with the Department of Anthropology at the University of California, Riverside, is co-director of Project Plaza of the Columns Complex at the UNESCO world heritage site of Teotihuacán. She recently published the book, “Animal Matter: Ritual, Place, and Sovereignty at the Moon Pyramid of Teotihuacan.”

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Credit: UC Riverside




The remains of nearly 200 animals found in Mexico’s Teotihuacán are helping reconstruct history.

The unearthing and significance of these remains, found in four chambers within the Moon Pyramid — dating back nearly 2,000 years — are central in Nawa Sugiyama’s new book, “Animal Matter: Ritual, Place, and Sovereignty at the Moon Pyramid of Teotihuacan,” published by Oxford University Press. 

Teotihuacán, one of the first megacities of the Western Hemisphere and now a UNESCO World Heritage site, is situated about 30 miles northeast of Mexico City. It is home to one of the most important ceremonial landscapes in Mesoamerica and was once the most influential metropolis in the region. Nearly 2,000 years later, Sugiyama, an assistant professor of anthropology at UC Riverside, joined the team that uncovered four dedicatory chambers with nearly 200 animal remains. 

In the largest chamber, measuring approximately 16-feet by 14-feet and known as burial 6, the team found 12 human remains along with over 100 animals, including 33 complete animal remains. This is believed to be one of the most abundant cases of mass animal sacrifice ever found in Teotihuacán and comparable only to those conducted by the Aztec empire over 1000 years later. 

Animals were major protagonists in Teotihuacán since they were gifted, sacrificed, or venerated, Sugiyama said. Most were apex predators, meaning top predators within the food chain.

“That’s really interesting from the zooarchaeology standpoint because there’s a fundamental shift in the ways we know Indigenous communities understood these potent apex predators as active agents and mediators of the sky realm, the earth, and the underworld,” Sugiyama said. “They were also in conversation with and interacting, sometimes in very dangerous ways, with the human communities that were trying to make connections to — and have power over —these natural sources of power themselves.”

Studying the bones using multi-archaeometric methodologies, including zooarchaeology and isotopes (bone chemistry), Sugiyama uncovered many details of these animal’s lives, including sex, diet, age, and whether they were sacrificed dead or alive. One common denominator she found in their diet was maize, or corn; in addition to maize serving as the primary staple food in Mesoamerica, many civilizations believed humans were created from maize and the crop served an important process in cultural and religious practices.   

“I don’t think it’s a mere coincidence, they were part of that process of creating a new politics, a new landscape, in which animals and humans coordinated one of the most ambitious ceremonial landscape constructions in ancient Mesoamerica,” Sugiyama said. 

Analyzing animal matter has allowed Sugiyama to recreate parts of the lives of animals such as golden eagles, Mexican gray wolves, hawks, owls, and falcons. The team also found evidence of jaguars, pumas, wolves, and rattlesnakes. 

Burial 6, the largest dedicatory chamber found, must have once been a “State spectacle,” witnessed by thousands of people, Sugiyama said. Sacrifices were government-sanctioned ritual performances staged at the heart of the Moon Pyramid. Teotihuacán thrived between 100 B.C. and 650 A.D., more than 1,000 years before the eminent Aztec civilization settled in. At its height, 100,000 people inhabited the metropolis.    

One of the stories lifted from the soils of ancient Teotihuacán is the importance of the golden eagle, an animal still held in high regard today. 

Sugiyama’s unearthing of 18 golden eagles in burial 6, representing one for each of the 18 months in Teotihuacán’s 365-day calendar, allows her to reimagine what the dedicatory ceremony would have looked like nearly 2,000 years ago. Sugiyama suggests the birds were carried by State officials on their forearm or shoulder (or some in captivity) through Teotihuacán’s main corridor leading to the endpoint, the Moon Pyramid, known as the Calzada de los Muertos or Avenue of the Dead. 

Today, golden eagles are still incorporated in national customs, such as the annual Mexican Independence Parade when a Mexican cadet parades to the city’s federal building, known as Zócalo, with a golden eagle standing on his forearm. 

“We are able to see the matter in which ancient Teotihuacanos materialized, felt, heard, created space, and understood their cosmos directly through the messages that are provided to us archeologists through the material remains of the bones that are speaking to us 2,000 years later,” Sugiyama said.

More on Nawa Sugiyama’s summer excavation work in Teotihuacán (story, photos, and video). 

Cavity-nesting birds decorate with snake skin to deter predators




Cornell University




ITHACA, N.Y. – When a bird drapes its nest with snake skin, it isn’t just making an interesting décor choice. Cornell University researchers find that for some birds, it keeps predators at bay.

Scientists combined new and historical data to show birds that nest in cavities – covered nests with small openings – are more likely to use shed snake skins in their construction than birds that build open-cup nests, and this practice helps deter predators from eating the eggs.

“What do snakes eat? They eat a lot of mice and small mammals,” said Vanya Rohwer, senior researcher and lead author of the paper published in the journal The American Naturalist.

“We think that an evolutionary history of harmful interactions between small-bodied predators of birds that are often eaten by snakes should make these predators afraid of snake skin inside of a nest,” Rohwer said. “It might change their decision-making process of whether or not they’re going to go into a nest.”

Birdwatchers have documented the use of snake skins in nests for centuries and speculated that it occurs more in cavity nests, but no one had tested this theory, said Rohwer.

To test what benefit birds might be getting out of the snake skin, the researchers explored if snake skin could reduce nest predation, reduce harmful nest ectoparasites, change microbial communities in ways that benefit birds or function as a signal of parental quality and increase the effort parents make in raising their young. Of these ideas, their results supported the nest predation hypothesis, but only in cavity nests.

For this experiment, the researchers placed two quail eggs inside more than 60 nest boxes and 80 inactive American robin nests placed around the Monkey Run Natural Area in Ithaca to simulate cavity and open-cup nests. Some nests received snake skins collected from a local snake breeder, and others did not.

Every three days for two weeks, researchers carried a ladder through Monkey Run to climb up to the nests and check on the eggs.

Trail cameras revealed that small mammals and avian nest predators visited open-cup nests, while only small mammals – namely flying squirrels – visited the nest boxes.

“If you were in one of those nest boxes and you had snake skin, you had a much higher chance of surviving that 14-day period,” Rohwer said. “The benefits of the material are most strongly expressed in cavity nests.”

For additional information, read this Cornell Chronicle story.

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New study provides insight into how some species thrive in dark, oxygen-free environments


New research on single-celled organisms sheds light on deep-sea energy sources


Woods Hole Oceanographic Institution

Working at depth 

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At depth, the team utilized modified push cores, or injector cores, to infuse a portion of the samples with a preservative (visible with red dye). These were then brought to the surface for gene-expression analyses to determine their metabolic pathways.

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Credit: Ocean Exploration Trust, NOAA Ocean Exploration, and NASA




Woods Hole, Mass. (Jan. 16, 2025) – Most life on Earth relies on the sun’s energy for survival, but what about organisms in the deep sea that live beyond the reach of its rays? A new study led by Woods Hole Oceanographic Institution (WHOI), published in The ISME Journal, sheds light on how a species of foraminifera, single-celled organisms found in almost all marine habitats, thrives in a dark, oxygen-free environment.

For this foraminifera species, the answer is chemoautotrophy, a metabolic process that utilizes inorganic energy sources, perhaps sulfide, to take up carbon, enabling it to survive in oxygen-free environments. Chemoautotrophy has been observed within Bacteria and Archaea, which are microbial organisms without a true nucleus. However, foraminifera are eukaryotes, meaning they have a well-defined nucleus, which houses an organism's genetic material.

“Animals, plants, seaweed, and foraminifera are all eukaryotes. We were interested in studying this foraminifera because it thrives in a very similar environment to Earth during the Precambrian, a time before the evolution of animals,” explained Fatma Gomaa, a research associate in WHOI’s Geology & Geophysics Department. “During that time, there was very little to no available oxygen in the oceans and higher concentrations of toxic inorganic compounds; conditions similar to some modern environments found on the seafloor, especially within sediments. Understanding the energy and carbon sources used by this foraminifer helps us to answer questions on how these species adapt to environmental changes while advancing our knowledge on the evolution of eukaryotic life on Earth.”

Using the remotely operated vehicle Hercules from the exploration vessel E/V Nautilus, operated by the Ocean Exploration Trust, the team collected sediments containing foraminifera about 570 meters (1,870 feet) below the ocean surface, off the coast of California. At depth, the team utilized two main methods to learn about the life strategies of the foraminifera. The first included infusing samples with a preservative (visible with red dye), preserving the foraminifera in situ. The researchers assessed their use of different metabolic pathways using gene expression analyses. Additionally, researchers used in situ incubations with an isotopic carbon tracer, a technique that allows tracking of labeled metabolites through chemical reactions. These incubations were kept on the seafloor for approximately 24 hours before being recovered and subsampled in red light.

“When we analyzed the seafloor tracer incubations, we could see that the tracer moved from the water and was associated with the foraminifera biomass. This gave us an idea of where these organisms were getting their carbon,” said Daniel Rogers, an associate professor of chemistry and department chair at Stonehill College. “It was important for us to make these observations at depth, where these organisms are in their natural state. By bringing them to the surface, we expose them to light, increase the temperature of their environment, and change the amount of pressure they’re under. This in situ approach gives us a more accurate depiction of how these organisms survive in such harsh environments.”

This study was funded by NASA, which is interested in the possibility of life on other planets and how it might survive. While the deep sea couldn’t be further from extraterrestrial planets, both environments share similarities such as cold temperatures, darkness, and in many locations, no oxygen. Joan Bernhard, a senior scientist in WHOI’s Geology & Geophysics Department and foraminifera expert, has been studying this population of benthic foraminifera for decades to learn how these fascinating creatures survive in this challenging environment and have done so throughout a large portion of Earth history.

“Foraminifera are extremely abundant on earth. Most are only about 300 microns in diameter, so rather small. In a volume as small as a pencil eraser, there could be about 500 of this particular species in this dark, oxygen-free and sulfidic habitat.” Bernhard explained. “This species takes up unrelated organism’s chloroplasts—organelles that perform photosynthesis if exposed to sunlight. This process is called kleptoplasty, in which an organism steals chloroplasts from another type of organism, even though these foraminifera are never exposed to sunlight. We know kleptoplasty is happening here, but we needed more research to understand why this foraminifer is so successful in the dark, without oxygen.”

Aside from their ability to thrive in what some consider to be an extreme habitat; the shells of foraminifera are also used in climate-change studies and for searching for hydrocarbon reserves. “We have fossil records of foraminifera dating back over half a billion years, which means we have a longer record of this group than most other life on Earth,” Bernhard continued. “By studying these fossils, we can see how their shells have responded to changes in the environment, like temperature, salinity, pH, or oxygen. By studying the geochemistry preserved in their shells, foraminifera are excellent tools for showing the age and environment of a geologic deposit. All of this information is essential for building accurate climate records. The fact that a foraminifera species is chemoautotrophic raises questions about their geochemical records and whether we are interpreting them correctly. Other foraminifera species may also be performing this way.”

Researchers also preserved specimens of two other foraminifera species and initial results suggest these types differ biologically. Scientists are presently conducting comparable analyses on these other species to pinpoint their energy and carbon sources.

About Woods Hole Oceanographic Institution

The Woods Hole Oceanographic Institution (WHOI) is a private, non-profit organization on Cape Cod, Massachusetts, dedicated to marine research, engineering, and higher education. Established in 1930, its primary mission is to understand the ocean and its interaction with the Earth as a whole and to communicate an understanding of the ocean’s role in the changing global environment. WHOI’s pioneering discoveries stem from an ideal combination of science and engineering—one that has made it one of the most trusted and technically advanced leaders in basic and applied ocean research and exploration anywhere. WHOI is known for its multidisciplinary approach, superior ship operations, and unparalleled deep-sea robotics capabilities. We play a leading role in ocean observation and operate the most extensive suite of data-gathering platforms in the world. Top scientists, engineers, and students collaborate on more than 800 concurrent projects worldwide—both above and below the waves—pushing the boundaries of knowledge and possibility. For more information, please visit www.whoi.edu

The all-female watch team is directing and recording ROV Hercules operations at Santa Barbara Basin. The ROV aided in the collection of sediments containing foraminifera about 570 meters (1,870 feet) below the ocean surface.

Credit

Ocean Exploration Trust, NOAA Ocean Exploration, and NASA

 

Arctic hotspots study reveals areas of climate stress in Northern Alaska, Siberia




Woodwell Climate Research Center
Ecosystem climate stress in the Arctic-boreal region, 1997-2020 

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Map of areas that experienced ecosystem climate stress in the Arctic-boreal region between 1997-2020 as detected by multiple variables including satellite data and long-term temperature records. 

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Credit: Christina Shintani / Woodwell Climate Research Center




Ecological warning lights have blinked on across the Arctic over the last 40 years, according to new research, and many of the fastest-changing areas are clustered in Siberia, the Canadian Northwest Territories, and Alaska. The analysis of the rapidly warming Arctic-boreal region, published in Geophysical Research Letters this week, provides a zoomed-in picture of ecosystems experiencing some of the fastest and most extreme climate changes on Earth.

 

Many of the most climate-stressed areas featured permafrost, or ground that stays frozen year-round, and experienced both severe warming and drying in recent decades.

 

To identify these “hotspots,” a team of researchers from Woodwell Climate Research Center, the University of Oslo, the University of Montana, the Environmental Systems Research Institute (Esri), and the University of Lleida used more than 30 years of geospatial data and long-term temperature records to assess indicators of ecosystem vulnerability in three categories: temperature, moisture, and vegetation. 

 

Building on assessments like the NOAA Arctic Report Card, the research team went beyond evaluating isolated metrics of change and looked at multiple variables at once to create a more complete, integrated picture of climate and ecosystem changes in the region.

 

“Climate warming has put a great deal of stress on ecosystems in the high latitudes, but the stress looks very different from place to place and we wanted to quantify those differences,” said Dr. Jennifer Watts, Arctic program director at Woodwell Climate and lead author of the study. “Detecting hotspots at the local and regional level helps us not only to build a more precise picture of how Arctic warming is affecting ecosystems, but to identify places where we really need to focus future monitoring efforts and management resources.”

 

The team used spatial statistics to detect “neighborhoods,” or regions of particularly high levels of change during the past decade. 

 

“This study is exactly why we have developed these kinds of spatial statistic tools in our technology. We are so proud to be working closely with Woodwell Climate on identifying and publishing these kinds of vulnerability hotspots that require effective and immediate climate adaptation action and long-term policy,” said Dr. Dawn Wright, chief scientist at Esri. “This is essentially what we mean by the ‘Science of Where.’”

 

The findings paint a complex and concerning picture. 

 

The most substantial land warming between 1997-2020 occurred in the far eastern Siberian tundra and throughout central Siberia. Approximately 99% of the Eurasian tundra region experienced significant warming, compared to 72% of Eurasian boreal forests. While some hotspots in Siberia and the Northwest Territories of Canada grew drier, the researchers detected increased surface water and flooding in parts of North America, including Alaska’s Yukon-Kuskokwim Delta and central Canada. These increases in water on the landscape over time are likely a sign of thawing permafrost.

 

Among the 20 most vulnerable places the researchers identified, all contained permafrost.

 

“The Arctic and boreal regions are made up of diverse ecosystems, and this study reveals some of the complex ways they are responding to climate warming,” said Dr. Sue Natali, lead of the Permafrost Pathways project at Woodwell Climate and co-author of the study. “However, permafrost was a common denominatorthe most climate-stressed regions all contained permafrost, which is vulnerable to thaw as temperatures rise. That’s a really concerning signal.”   

 

For land managers and other decisionmakers, local and regional hotspot mapping like this can serve as a more useful monitoring tool than region-wide averages. Take, for instance, the example of Covid-19 tracking data: maps of county-by-county wastewater data tend to be more helpful tools to guide decision making than national averages, since rates of disease prevalence and transmission can vary widely among communities at a given moment in time. So, too, with climate trends: local data and trend detection can support management and adaptation approaches that account for unique and shifting conditions on the ground.

 

The significant changes the team detected in the Siberian boreal forest region should serve as a wakeup call, said Watts. “These forested regions, which have been helping take up and store carbon dioxide, are now showing major climate stresses and increasing risk of fire. We need to work as a global community to protect these important and vulnerable boreal ecosystems, while also reining in fossil fuel emissions.”

 

***

This project was supported by the Gordon and Betty Moore Foundation and through the TED Audacious Project for Permafrost Pathways: Connecting Science, People, and Policy for Arctic Justice and Global Climate. 
 

 

 

 

How to reduce environmental impact with diet: a Politecnico study published in Nature


Meeting the Lancet ‘healthy’ diet target while protecting land and water resources


Politecnico di Milano




Milan,  16 January 2025 – Is it possible to feed the planet in a healthy way while reducing the use of land and water? A study conducted by researchers from the Glob3science Lab of the Department of Civil and Environmental Engineering at the Politecnico di Milano and published in Nature Sustainability, proposes a global model that makes the best use of agricultural and water resources, making the adoption of the EAT-Lancet universal reference diet a sustainable possibility.

The EAT-Lancet diet is a science-based dietary model that aims to improve human health while reducing the environmental impact of food production. It advocates a balance between different foods of plant origin, such as whole grains, fruit, vegetables, legumes and nuts, and a limited intake of food of animal origin. However, it was unclear until now how the food system could be reorganised in a way that would allow this diet to be adopted on a global scale without compromising natural resources.

The researchers looked at six country-specific dietary scenarios, combining an agro-hydrological model with studies into optimal use. Crop redistribution and improvements to trade flow could reduce the extent of global cropland by 37-40% and irrigation water use by 78%, while meeting the nutritional requirements of the EAT-Lancet diet.

The model shows that the global adoption of this diet would require an increase in international food trade, increasing the amount of production set aside for export from 25% to 36%. On the economic front, it is estimated that this would lead to a 4.5% increase in food costs, while also bringing significant environmental and nutritional benefits.

As Professor Maria Cristina Rulli, coordinator of the research, explained: "This study shows that it is possible to ensure healthy and sustainable diets for everyone, while also protecting the planet's basic resources.
 Our research suggests that smart crop redistribution and better management of trade flow could lead to more efficient use of agricultural and water resources on a global scale. However, for all this to be implemented, we need both targeted policies that support a reorganisation of the food system - including financially, plus social acceptance and the desire to share. Then there are the co-creation processes involving local producers, in relation to the redistribution of crops."

The study is available in Nature Sustainability, and offers a real roadmap for more equitable and sustainable food production in the future.

On the 8th of November, Maria Cristina Rulli of the Glob3science Lab at the Politecnico di Milano and Paolo D’Odorico of the University of California, Berkeley, were awarded the Prince Sultan Bin Abdulaziz International Prize for Water (PSIPW) at the United Nations. This prestigious award was in recognition of their innovative research into the water-energy-food nexus, which offers real solutions for the sustainable management of water resources, responding to the global challenges of an ever-changing world.

 

Rulli, M.C., Sardo, M., Ricciardi, L. et al. Meeting the EAT-Lancet ‘healthy’ diet target while protecting land and water resources. Nat Sustain (2024). https://doi.org/10.1038/s41893-024-01457-w