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IMAGE: VARIETIES OF MAIZE FOUND NEAR CUSCU AND MACHU PICHU AT SALINERAS DE MARAS ON THE INCA SACRED VALLEY IN PERU, JUNE 2007. THE HISTORY OF MAIZE BEGINS WITH ITS WILD.

Eurekalert.org

More exciting news about Maze and it’s beginings!

You have to read this one.

I do believe the reference to “rice” means wild rice.

JLP

 

 

Scientists are revising the history of one of the world’s most important crops. Drawing on genetic and archaeological evidence, researchers have found that a predecessor of today’s corn plants still bearing many features of its wild ancestor was likely brought to South America from Mexico more than 6,500 years ago. Farmers in Mexico and the southwestern Amazon continued to improve the crop over thousands of years until it was fully domesticated in each region.

Source: Scientists overhaul corn domestication story with multidisciplinary analysis

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Sambaqui societies had sophisticated diet. Study suggests that hunter-gatherer communities living in coastal Atlantic Forest areas between 8,000 and 1,000 years ago consumed a range of plants and more carbohydrates than expected for the period and region.

Source: Study puts the Neotropics on the map of the world’s food production centers in antiquity

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Part 2

this is quite a long article but interesting.

Hakaimagazine

by Erik Vance

Of course there were pirates,”  Vera Tiesler says.

She’s quick to add that there is no direct evidence of ancient Maya pirates, but given how much valuable cargo was passing through these ports—and the fact that boats were often depicted carrying armed warriors—it’s a pretty good guess. Chances are, piracy started long before Europeans arrived. The presence of pirates of the ancient Caribbean might also explain the tall pyramid that could serve dual functions: for religious ceremonies and as a lookout. Vista Alegre had another quirk. In pre-Columbian times, the settlement was on a peninsula, with three sides facing the water (the bays on either side have since filled in) and an elaborate stone wall, probably topped by a wooden barrier, guarding the south-facing fourth side. But there appears to be no roads or settlements in that direction. Why build a wall if there’s no one on the other side to keep out?

The wall was likely meant to keep out marauders who, worried about being spotted on the water, would land nearby and try to enter the city by land. Many of the sites along the coast have similar walls to Vista Alegre. The ruins of Isla Cerritos, 100 kilometers to the west, had a 305-meter wall that blocked the harbor like a giant arm shielding the city.

Beyond physical defenses, little else is known about coastal battles of the Maya world. Were there trained ocean fighters? Specially designed warships? Naval strategies? In fact, of the thousands of boats that once littered the coasts, all that has survived is a single canoe preserved in peat soil that dissolved almost as soon as it touched the air and a couple of paddles discovered in Belize. Yet, according to the first Spaniards to visit the coast, the Maya used many types of boats with up to 25 paddlers and capable of hauling over three tonnes of material, which is more than some midsize pickups can handle today.

Some canoes may have even had sails. Several Spanish chroniclers describe seeing sails along the coast—there are no images, however, of sails among the codices and murals of the Maya themselves. Many local people still build traditional boats and even host international paddle races, but it’s tough to know what parts of these traditions are old and which are new.

Modern Maya canoe builders have specific rules about construction. “For example, when to cut down the tree, which tree,” says Mariana Favila, an anthropologist at the National Autonomous University of Mexico, who is writing her PhD thesis on the maritime practices of the Maya, partly by spending time with modern indigenous communities.

She points out that there are many traditions around boatbuilding that seem to predate Europeans, such as a ban on women being near a boat while it’s being built. Local tradition holds that women are associated with cold, whereas men are characterized by heat. Thus, for boats—which are also tied to cold—to stay afloat, they must be kept separate from women.

When most people imagine an ancient Maya city, they probably picture Chichén-Itzá with the commanding El Castillo at its center, surrounded by ball courts of varying sizes and wide plazas. But the sites we see today were the ceremonial centers of the cities, not where people lived. Studying a pyramid is like trying to understand the United States by digging up the Lincoln Memorial. It tells you something about values and traditions, but not daily life.

For that, you need to see where the ancient Maya lived and worked. Modern satellite images and laser-guided surveys from planes have revealed that Maya cities were far more sprawling than anyone would have ever guessed. Earlier this year, a large multinational team announced that several cities in northern Guatemala once presumed separate were, in fact, connected by 60,000 previously unseen structures.

Many of these were wooden houses built on low platforms. But, like giant, ravenous beasts, the tropical landscapes of the Yucatan and Petén Basin gobbled up all the wooden structures they touched, along with tools and boats. Except in one place—an ancient lagoon in Payne’s Creek National Park, a nature preserve encompassing savannah, tropical rainforest, and mangroves in southern Belize.

Heather McKillop, an archaeologist at Louisiana State University, first came to Payne’s Creek in 2004 on an odd sort of archaeological scouting expedition. She knew that there had been settlements in the area and that the ocean had risen since then. So rather than shovels and pickaxes, she brought a swimsuit, a couple of buckets for specimens, and a vague notion that the rich lagoon soils were hiding interesting artifacts probably related to salt making. She and a few students waded into the water and quickly found all sorts of ceramic shards from pots used to boil briny seawater to collect salt and the occasional wooden stump—probably either a dead tree or driftwood washed in from storms.

“Wood doesn’t preserve in the rainforest,” McKillop says. “I thought, oh they’re just old tree roots or they’re pieces of wood that have drifted in.” There’s no way they were left over from the Maya, that would be ridiculous. Termites, shipworms, or thousands of other creatures that scour the jungles and shores for detritus quickly devour wood here. But just out of curiosity, she and her students decided to dig up one.

“I said, if it’s a post, it’s going to go straight down and the end is going to be sharpened. If it’s a tree, it’s going to branch out,” she says, assuming at the time they were all dead trees. “I just want to settle this once and for all.”

They took turns holding their breath, ducking a meter underwater, and scraping around the sides of the logs. The soil was a heavy sort of peat, covered in moss that was perfect for clutching while digging with the other hand. Finally, they got to the bottom and freed the wood, pulling it up to the surface.

“The four of us are looking at it, and the end comes out of the water. And it’s sharpened,” she says. It was like reaching into a wastebasket in Rome and pulling out a poem by Julius Caesar. No one had ever found something like this. “Then they all looked at me and say, ‘So what is it?’”

That same trip, they found more than a dozen sites along the creek and the first-ever intact Maya canoe paddle. Since then, McKillop and her team have found more than 4,000 such posts—perfectly preserved in the oxygen-deprived peat—in a five-square-kilometer area, using masks and snorkels while floating facedown on cleverly modified pool loungers.

The sheer number of posts in such a small area suggests that the coastline once bustled with salt works. Salt is crucial to all civilizations, not just as food but also as a preservative. Experts always assumed the Maya collected it along the shoreline and passed it inland, but now they had evidence of whole communities dedicated to producing salt.

“If you sat on the beach, you would watch two boats go by every single day full of salt. It’s not an occasional thing, this would be a very regular transport schedule,” says Thomas Guderjan, an archaeologist at the University of Texas at Tyler who specializes in Maya agriculture and city planning. “You could not service that population just with an occasional guy who takes a paddle up to get salt. This would be a very structured market.”

No one knows for sure how the ancient Maya economy worked, but trade was likely crucial. Quetzal feathers (found in tropical cloud forests) came downhill, jade (found in the south) went north, shells went inland to the mountains of central Mexico, and obsidian (found in the volcanic spine of the continent) went to the flatlands of the Yucatan. There were no pack animals or wheels for carts, and boats packing a few tonnes of material would have been highly efficient.

But not everyone is so convinced by this picture. Rafael Cobos Palma is an archaeologist at the Autonomous University of the Yucatan with perhaps more experience investigating the coastal Maya than anyone else alive. He doesn’t see some kind of market-based trade but something more like a pipeline completely controlled by elites from Chichén-Itzá.

“Trade is not the correct word to use,” Cobos Palma says. “Nobody else participated. It was a closed system.”

He compares the gold and turquoise coming along the coast to Fabergé eggs created for Russian royalty during the turn of the last century. It’s not really trade if the materials go only in one direction. He admits that there might have been other, less-formal trade systems that siphoned goods to a few other cities, but insists this isn’t because of a market, it’s from leaks in the pipeline.

It’s a controversial idea, considering how long the ports operated and the variety of goods the coastal Maya moved and how different their culture seems from their inland neighbors. But it gets at a fundamental question about the ancient Maya. Did they have an economy the way we think of it—with currency, merchants, and markets? Or was it controlled by the iron fist of the state? Perhaps the answer lies in one of the many unexcavated sites along the coast, like Xel-Ha or Xcalak.

There’s just one problem: many of these sites are underneath multimillion-dollar resorts.

Ironically, the global fascination with the ancient Maya that puts pyramids on magazine covers and in Indiana Jones movies has helped fuel a tourism industry gobbling up wide swaths of the coastline, including many Maya sites. Xel-Ha, an ancient city north of Tulum, is now an amusement park, with playgrounds, rides, and concession stands. Others are in the middle of golf courses, and one, a rare cave shrine, is poking up through a Home Depot parking lot. When Rissolo wanted to see an important shrine at Xcaret, near Playa del Carmen, he had to buy tickets and walk past the souvenir shops and a dolphin tank to get there.

Thankfully, many sites were visited and cataloged by archeologists before the all-inclusive resorts moved in, though most of these studies were just cursory. Still, someday archaeologists may be able to finish what they started.

“The bulldozer might have destroyed one or two platforms here or there but there’s certainly more information. And fortunately, all that information is underneath,” Cobos Palma says.

More destructive might be time itself. Cobos Palma points out that the coast of Tabasco, just west of Vista Alegre, is suspiciously short on ancient sites. The best explanation is that they have been buried under soil or rising seas. One of his research sites, Uaymil, was once on the coast but is now more than a kilometer inland. McKillop’s research area was originally on solid ground until the oceans rose up around it. Others could have been wiped out by a single well-placed hurricane.

But there’s still too much to find to despair about what’s been lost. Some of the most important coastal ports may remain undiscovered.


Back at Vista Alegre, far from the lively coastline of Cancún, Rissolo and Glover finish their survey, and we pile back into our skiff. Unlike the east coast of the Yucatan Peninsula, the northern end is nearly deserted. It’s a beautiful day, with enough wind to kick up some sea spray but it’s still pleasant. The previous week, the area had been buffeted by powerful winds as Subtropical Storm Alberto formed offshore and charged toward Florida. Roads in the area have been flooded for days and Cancún ground to a standstill. And that was just a small storm. Imagine a powerful monster like Hurricane Wilma—which devastated the region in 2005—and it’s easy to see why not everyone has embraced the coast.

“This entire coastline is unpopulated,” says Rissolo, looking west toward the Gulf of Mexico. “From an archaeologist’s perspective, there’s really a great opportunity to study how the ancient Maya organized themselves on the landscape. Imagine trying to do what we’re doing when you’ve got golf courses, all-inclusive resorts, and shopping malls that run all the way from Cancún to Tulum.”

On the way back to the harbor, they decide to take a little detour. Locals say there is perhaps evidence of a settlement on the nearby island of Holbox, an emerging vacation spot for off-the-beaten-path tourists. One archaeologist documented the site in the 1950s, but no other scientist has visited the place. Rumor has it there are a few stone structures and maybe a shrine. Somewhere. Glover pulls out a drone and attempts to launch it.

“That’s a stiff wind, dude,” he says to no one in particular, testing the drone’s rotors. “Not ideal.”

“We don’t even know if it’s in the interior. Is it at the edge of the mangroves? The coastline is just so complex,” Rissolo mutters.

Glover eventually gets the drone airborne and battles the wind for a while, taking video he hopes will later reveal the site. It’s bizarre that there could be an undocumented ancient settlement 100 meters from our boat and we can’t see it. But then again, that’s the story of modern Maya archaeology. In recent years, the biggest discoveries haven’t been pyramids or kings but pedestrian things: ancient farm fields, roads, and salt factories. Seeing how the Maya constructed their civilization, in addition to their sacred buildings, has broadened our view of how their world looked. It was a world of mysterious ceremonies and unusual head shapes, but also one of people who were adept at getting what they wanted quickly and efficiently.

Eventually the researchers give up—Glover is wary of running out of battery power and crashing the drone into the water. They agree to come back, perhaps with kayaks, and inspect the mangroves more carefully.

They fire up the engine and motor toward the mainland. The clouds are almost gone, and tomorrow promises to be another perfect day in paradise. Boatmen will cart tourists to the island, just as they have for decades, while the fishermen load up their nets to leave at first light—just as they have for thousands of years.

 

 

 

 

 

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Part 1

For thousands of years, ancient Maya kings ruled a vast inland empire in Mexico and Belize. But just how inland was it, really?

Vista Alegre, a ruin of a town near the northern tip of the Yucatan Peninsula in Mexico, was once a bustling outpost. Dozens of canoes crowded the harbor, loaded down with dyes from the west, jade from the south, and obsidian from mountains hundreds of kilometers away. The sound of trumpeting conch shells periodically sliced the air—an alert from sentries scanning the horizon from platforms attached to stone structures. The call signaled an incoming boat—to trade or, perhaps, to plunder.

Within the town, the smell of fish hung heavy in the air as fishermen hurried about with their catches slung across their backs. They passed a man outside his hut hacking a pile of decorative shells into portable sizes for the next outgoing canoe. In another hut, a woman was using salt from a town to the south to dry freshly caught fish that would then be shipped to cities far away. And all the while, smoke from a signal fire atop a pyramid guided exhausted ocean travelers to safe harbor.

Today, a thousand years later, the town isn’t much to look at. Centuries of accumulated dirt and vegetation cover the pyramids. Trees growing on various structures have succumbed to gravity, tumbling and taking with them massive stone blocks once perfectly fitted together.

Today, the ruins of Vista Alegre, on the northern Yucatan coast, are barely visible but still reveal much about the ancient maritime Maya. Video courtesy of Jeffrey Glover and Dominique Rissolo

Though part of the ancient Maya world, which stretched from here all the way into modern-day El Salvador, Vista Alegre lacks the grandeur of many sites. It doesn’t have the dozens of glistening pyramids that lure millions of tourists to Chichén-Itzá, the enticing carvings of Palenque, or the vibrant murals of Bonampak. In fact, were it not for a single pyramid in the middle of a handful of crumbling structures, you might miss its human past altogether. But this small port town at the bottom of the Gulf of Mexico was once part of a complex network of coastal commerce that dominated the ancient world but has been understudied by academics and ignored by the public. Because, unlike Chichén-Itzá or Palenque or Bonampak in the interior of the country, time has nearly erased coastal ports like Vista Alegre from history.

It’s part of a growing collection of archaeological sites revealing a complex and cosmopolitan network of sea traders with their own culture and traditions, who are at once separated from and deeply tied to their more famous compatriots deep in the Yucatan jungles.

“Our knowledge of markets and the role of markets is changing in the Maya area,” says Jeffrey Glover, an archaeologist at Georgia State University. Glover stands on a cluster of exposed blocks at the top of Vista Alegre’s steep central pyramid with its commanding view of the coastline. Looking out, he seems to see the town as it once was, even describing it in the present tense. “There are a lot of people there that need stuff and that want stuff. And they’re probably getting gold from as far south as Panama and Costa Rica, with turquoise that’s coming from the American Southwest.”

Glover and his colleague Dominique Rissolo have been exploring this small site for more than a decade. When they first came to this undeveloped coastline over two hours northwest from Cancún by car and then boat, they expected a small town dependent on the fortunes of the much larger Chichén-Itzá—a nameless cog in the machinery of a great city only 125 kilometers away. But that’s not what they found. Vista Alegre predates the larger city by hundreds of years. The people here ate differently, had different fashions, and traded an astounding diversity of precious things from around Meso-America.

And there was something else here that the archeologists did not expect. The town’s central 10.6-meter-high pyramid is oddly steeper than others in the region—made possible by an unusual concrete recipe that connects its stones and is usually found hundreds of kilometers to the west. This innovation, presumably gleaned from passing travelers, allowed them to build a pyramid tall enough to let them see for a great distance in all directions but with fewer blocks than typical pyramids.

“It blew me away when I saw it. I hadn’t seen anything like that anywhere in this region,” says Rissolo, a researcher at the University of California, San Diego. “There’s a certain kind of cosmopolitan nature to the site, where people are exposed to different styles and different traditions.”

As we walk the grounds, Rissolo regularly leans down to pick up bits of pottery, some 1,500 years old. It turns out that Vista Alegre was just one of dozens of small settlements that rim the Yucatan Peninsula at about 40-kilometer intervals, the distance a team of paddlers can move a goods-laden boat in a day. None of the coastal communities had the grandeur of the bigger Maya cities, but when put together, they paint a vivid picture of commerce in the region. And, in another surprise, of combat.


The Maya are often called “people of corn” because their identity is forever tied to that crop. Academic and popular stories paint pre-Colombian Maya as a peaceful, inland people who tended crops, feared the sea, and looked to the stars. As with all historical generalizations, however, this picture has faded with new discoveries. Modern scientists have found that the real ancient Maya were just as war-prone as Aztecs or Europeans and perfectly comfortable on the sea.

Looking at the bones from sites like Vista Alegre, scientists now know the ancient coastal Maya ate healthier than their inland compatriots, getting more protein from sea life. Evidence suggests they were more egalitarian too, though less sophisticated in their cultural traditions. Take the common ancient practice of head shaping (whereby boards are tied to an infant’s head to cause it to grow a certain way). Whereas people in Calakmul, near the border of modern-day Guatemala, had a myriad of head shapes fashioned from birth, those on the coast kept it simple—just a slightly elongated head. And rather than elaborate jade- or obsidian-inlaid teeth, coastal people tended to simply sharpen them down a little. But that’s not to say they were boring.

The people came from all over, says Vera Tiesler at the Autonomous University of Yucatan. “There was a big melting pot of people there, traveling down the coast.”

Tiesler is a bioarchaeologist. Rather than digging up pyramids or looking for jade jewelry, she studies human remains. From diseases to wounds to DNA, a set of bones can tell you more about people than a stone structure. And while the Maya coastline may not have a lot of fancy pyramids or ornate paintings, it has a lot of bones littered around—the soil composition and high salt levels lead to wonderful bone preservation.

When a Mayanist finds a set of bones, it often finds its way to Tiesler. And after looking at hundreds of ancient skeletons, she’s come to see the coastal Maya as a sort of subculture. Their seafood diet—revealed through bone analysis—suggests that over generations, families spread long distances along the coast but rarely went inland. It was as if once they found the coast, they didn’t want to leave it.

Coastal Maya also fought differently than their inland compatriots. Contrary to their reputation, the ancient Maya engaged in plenty of warfare. Armies would face off with clubs, hatchet-like weapons, and throwing spears called atlatls. In hand-to-hand combat, injuries were mostly sustained on warriors’ left sides from right-handed assailants. But Tiesler says battle scars of the ancient coastal Maya favor no side. Also, ancient armies were usually all male, but a higher-than-expected number of the violent casualties Tiesler sees were women. Plus, many combatants survived, which would be odd on a battlefield. The likely reason for these discrepancies between Maya armed conflict wounds and these coastal casualties? Piracy.

 

 

 

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(Photo: Courtesy of Jean-Michel Ané)

Much of this article is about current and future agriculture practices but i’ve printed in bold the link to ancient farming and how farmers cultivated for this nitrogen trait. JLP

 

Original Article:

usatoday.com

By Anna Groves

Farmers in a small area of southern Mexico knew that a variety of corn grown in the area was special.

But a group of researchers believe the corn could ultimately transform the way the largest crop in America and the world is grown.

The potential improvements in water and air quality – not to mention financial savings – are staggering. In fact, the lead researcher acknowledged he and his colleagues spent a decade studying the corn before going public this month because the conclusions were “almost outrageous.”

And, like so much research in its early stages, there are still a lot of “ifs.”

But scientists at University of Wisconsin-Madison, University of California-Davis and Mars Inc. (yes, the candymaker) have determined that farmers in Oaxaca, Mexico, have been growing corn that creates its own fertilizer for centuries, if not millennia.

Understanding the process requires a short course in biology.

The plants in Mexico have bizarre fingerlike roots sticking out of their stalks. The roots secrete a goopy mucus, in which bacteria live. The bacteria take nitrogen from the air – which plants can’t use – and convert it to a different form of nitrogen that they can use. The plants soak up the fixed nitrogen in the gel through the fingerlike roots.

The nitrogen is a critical nutrient for all plants; it’s the primary ingredient in chemical fertilizers.

The process is part of a cycle. The bacteria live on carbon, which the plant supplies in the form of sugar. The sugar is produced through photosynthesis. Through this odd trade agreement, the plant gets usable nitrogen, the bacteria get necessary carbon and both parties are happy.

Nitrogen fixation is best known for occurring in legumes like soybeans. The bacteria live in their roots and the surrounding soil. But this had not been demonstrated in grasses like corn.

A decade of research

The researchers found out about the corn from Howard-Yana Shapiro, the chief agricultural officer at Mars and adjunct professor at UC-Davis. Decades ago, he had the idea to look for unusual traits in crops that traditional farmers have adapted to their particular climate and soil. He hoped to find something that could improve crops globally.

When Shapiro came across 16-foot-tall cornstalks growing on an Oaxacan mountain slope where nutrient levels and fertilizer availability should have been low, he knew they deserved a closer look.

Jean-Michel Ané, professor in the UW-Madison Department of Agronomy, has been involved in the project since 2010. “They came to me and asked if I thought it was possible that corn could be associated with nitrogen-fixing bacteria, and I thought, no way.”

The research group first collected samples from cornfields in the Sierra Mixe area of Oaxaca in 2010. When they noticed the goopy aerial roots, “We were like, that’s weird,” Ané said.

They tested the goopy gel, and it tested positive for one of the byproducts of the nitrogen fixation process.

But that alone didn’t prove the plant was getting nitrogen from the bacteria instead of the soil, Ané said. The researchers ran tests from every angle they could think of: Are any of the bacteria found in the gel known nitrogen-fixers? Does the corn soak up less nitrogen from the soil than a similar, non-nitrogen-fixing variety? Does the corn for sure soak up nitrogen from the gel?

The answers were yes, yes and yes.

“It took us several years to convince ourselves that it was true. That’s why it took us almost 10 years to publish that paper. It’s a big claim. We wanted to be sure,” Ané said.

An ancient trait

Researchers have spent decades trying to get corn to create its own fertilizer by partnering with nitrogen-fixing bacteria, with no luck. But these new findings show that nature had already given corn that potential.

The researchers decided to essentially turn back the clock and examine a type of grass native to Mexico and Central America thought to be the ancestor of corn. In the same way that modern dogs were bred from ancient wolves, corn had been bred from teosinte. 

They looked at species of teosinte to see if any had signs of the gel or the nitrogen-fixing bacteria that the Oaxacan farmers could have amplified over time, just like Midwestern farmers later amplified traits like kernel size and uniformity.

They did.

“I see this as a good argument for preserving biodiversity,” said Chase Mendenhall, tropical biologist at the Carnegie Museum of Natural History. “Nature had innovated something we would never be able to innovate. The lab couldn’t have developed that on its own.”

A sustainable future?

The researchers found that the Mexican corn gets 29% to 82% of the nitrogen it needs from this partnership instead of the soil. Its nine-month growing season and other traits mean it’s not ready to grow as-is worldwide. But if that trait can be bred into other corn, it would mean an equivalent reduction of nitrogen fertilizer use globally.

Christopher Kucharik is associate professor and department chair of the UW-Madison department of agronomy. Not involved with this research, Kucharik studies agriculture issues related to land management, climate change and sustainability. He said the study has the potential to be a watershed moment.

Kucharik said that some people argue the energy use that will be saved from reducing fertilizer use on corn is “only” 1 percent to 2 percent. “But any little bit helps. … There’s no silver bullet to reduce our energy use. If we can come up with 30 or 40 things that each reduce our energy use 1%, that’ll add up.”

“It’s pretty encouraging and could be a game-changer,” Kucharik said.

Credit where credit’s due

Samples of the corn are now back in labs at UW-Madison, where Ané and his colleagues are putting it through more tests.

Ané said the people of Sierra Mixe agreed to the researchers publishing the findings and that the Mars company is working to make sure they are protected and will benefit from the discovery. “They and their ancestors are the ones that did the breeding to amplify that trait,” emphasized Ané.

“The people have a strong cultural attachment to that corn and they’re proud of that corn.” One interesting fact not in the (published research) paper is the farmers who are there actually collect the gel and keep it in their homes in jars. They use it in various rituals. They know that the gel is special – the more gel the corn is producing, the better the corn is producing.”

Scientists may have figured out a more environmentally friendly way to protect crops from bugs. But instead of pesticides, it involves fake caterpillars made of Play-Doh and fake larvae made of orange pinheads.

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Corn smut: disfiguring but delicious.
CARMEN HAUSER / GETTY IMAGES

 

Original Article:

cosmosmagazine.com

 

Eating only maize leads to disease, and why the Basketmaker II people didn’t fall ill has long been a mystery. Now it’s been solved. Andrew Masterson reports.

 

A mystery concerning how some of North America’s first farmers survived on a diet that appears manifestly inadequate may have been solved.

The ancestral Pueblo people who lived in what is now known as the Four Corners region of the southwestern United States shifted from a nomadic to a settled lifestyle centred on crop-growing around 400BCE.

The primary crop cultivated was maize (known in the US as corn), which accounted for an estimated 80% of calorific intake.

During the ensuing 800 years – a stretch known as the Basketmaker II period – the settlers’ diet contained very little meat. This was perhaps a cultural choice. Basketmaker II people became efficient turkey farmers, but the birds were raised primarily for their feathers, used in the manufacture of blankets, and for certain ritual purposes. They were not eaten.

The nutritional components of Basketmaker II cuisine has been well established through a number of analyses, including radio-isotope sampling conducted at burial sites. A study published in 2013, for instance, found that while maize comprised the massive bulk of food intake, it was accompanied by small amounts of wild plants, including yucca, and – more so in men than women – occasional bits of wild rabbit.

Over all, the Pueblo menu should have been dangerously low in a number of essential nutrients, particularly niacin, tryptophan and lysine – the lack of which leads to a range of ailments, including pellagra, an often fatal disease that results in diarrhoea, dermatitis and dementia.

However, no Basketmaker II human remains ever tested have shown evidence of such an illness. This fact leads to the obvious conclusion that the people must have been able somehow to access the crucial nutrients. There is evidence that at least one community boiled maize in limestone, which would have made some amino acids locked up in the corn more biologically available – but even then the amounts would still have been too small to meet dietary needs.

Now, however, archaeologist and biological anthropologist Jenna Battillo from the Southern Methodist University in Texas may well have found the answer to puzzle.

It turns out to be an organism that today is considered a menace by commercial maize farmers: a fungus called Ustilago maydis, or, more prosaically, corn smut.

Analysing “human paleofaeces” found at a Basketmaker II site known as Turkey Penn Ruin in Utah, Battillo found plentiful evidence of U. maydis spores. This, she writes in a paper published in the Journal of Archaeological Science: Reports, indicates that the fungus was included as an intentional part of the diet.

There is considerable later evidence to back up the suggestion. The fungus, which forms distinctive lumps or “galls” on maize heads, is today a popular food in Mexico, where it is known as huitlacoche. It is also popular among some communities in Central America.

Battillo cites a number of studies that found corn smut was historically considered a delicacy among southern and meso-American societies, including the Aztec, Maya and Hopi.

U. maydis causes loss of vitality and weight as well as cosmetic disfigurement in maize and is therefore hated by commercial growers. About 4% of the US crop is lost to the fungus each year – well down from the estimated 80% that blighted farms in the nineteenth and twentieth centuries.

For the Basketmaker II people, however, the fungus infection was very positive – indeed, quite literally, a lifesaver.

Battillo reports that corn smut alters the nutrient content of corn. It increases the protein levels from as low as 3% to as high as 19%. It also dramatically boosts the levels of lysine, and introduces 16 other essential amino acids. The only one missing is tryptophan, for which no data is available – Battillo suggests limestone boiling and input from other minor food sources might have been sufficient to provide the average four milligrams a day required to maintain health.

And while the new research seems to answer the question of how Basketmaker II people supplemented their nutrient-poor maize diet, it still leaves another matter unresolved.

The evidence, says Battillo, cannot determine whether the early farmer communities intentionally introduced or encouraged corn smut on their plants, or whether infections happened by accident and were simply tolerated.

In either scenario, she concludes, “the ubiquity of the spores in paleofaeces from Turkey Pen Ruin strongly supports intentional consumption”.

 

 

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Original article:

Eurekalert.org

 

University of Cincinnati archaeologist Alan Sullivan found scant evidence that people grew corn around the Grand Canyon 1,200 years ago. Instead, he said they used fire to cultivate wild foods.

Source: Archaeologist says fire, not corn, key to prehistoric survival in arid Southwest

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Original article:

Nature.com

Changes to flowering times helped the staple crop spread into new areas thousands of years ago.

Genome sequences from nearly 2,000-year-old cobs of maize (corn) found in a Utah cave paint a portrait of the crop at the dawn of its adaptation to the highlands of the US southwest. That maize, researchers found, was small, bushy and — crucially — had developed the genetic traits it needed to survive the short growing seasons of high altitudes.

The team’s study1, published on 3 August in Science, is remarkable in how it tackles complex genetic traits governed by the interactions of many different genes, say researchers. It uses that information to create a detailed snapshot of a crop in the middle of domestication. Such insights could help modern plant breeders to buffer crops against global climate change.

Geneticists of both modern and ancient crops have poured tremendous effort into understanding maize, which was one of the most important subsistence crops in the New World thousands of years ago, and is a cornerstone of global agriculture today.

Maize originated in Mexico and rapidly spread into the lowlands of the southwest United States about 4,000 years ago. But communities at higher altitudes did not fully embrace the crop until 2,000 years later — a delay that has long puzzled archaeologists studying the region, says Kelly Swarts, a quantitative geneticist at the Max Planck Institute for Developmental Biology in Tübingen, Germany. “There was always the question: why wasn’t this catching on? Why weren’t people doing agriculture in the uplands?” she says.

Swarts and her colleagues turned to a site in a Utah cave called Turkey Pen Shelter, where a farming community lived about 2,000 years ago. Inhabitants of the cave raised turkeys, wove intricate baskets and shoes, and had the resources needed to store and process corn. Maize, which they probably served in soups and stews, comprised about 80% of their diet.

Complex crops

Swarts’s team sequenced the genomes of fifteen 1,900-year-old maize cobs found in the shelter and compared their sequences to those in a database of genomes and physical traits from some 2,600 modern maize lines. The researchers then used that information to extrapolate the physical characteristics of the Turkey Pen maize plants, including complex traits such as flowering time. The analysis revealed a crop that was shorter and more branched than modern varieties. “More like little bushes,” says Swarts, though the role of these traits is unclear. The crop also flowered more quickly than lowland varieties — an important adaptation to life in the highlands, which have a shorter growing season than lower elevations.

The analysis could open the way for similar studies of complex traits in other plants and animals, including humans, says Matthew Hufford, who studies evolutionary genomics in maize at Iowa State University in Ames. “We just now have the genetic tools and the analytic tools to make really good use of them.”

Plant evolutionary biologist Robin Allaby of the University of Warwick, UK looks forward to seeing the same approach applied to earlier stages of maize domestication. “That stuff was 1,900 years old, and a lot of the whistles and bangs had already happened,” he says. “It’s going to be really cool to see what a full 5,000-year-old maize phenotype looks like.”

A key finding from the study, says Hufford, was the realization that the genetic variants needed to adapt to highland life were already circulating in maize populations thousands of years ago “The diversity needed for high altitudes was there, but getting it in the right combination took 2,000 years,” he says.

And that diversity could be crucial for breeders as they try to adapt modern maize to a rapidly changing climate, says Swarts. “It’s really promising for maize’s future that it has so much standing variation — assuming we can conserve that diversity,” says Swarts. “If we needed to do this, it wouldn’t take 2,000 years. We could do it a lot faster now.”

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These are preserved maize cobs from the El Gigante rockshelter, Honduras, directly dated by AMS 14C. The largest cob, pictured at middle, is roughly 10 cm (4 in) in length. The first four cobs from the left date to the Late Formative period (approximately 2,200 years BP), while the cob at the far right dates to the Late Archaic, nearly two millennia older (approximately 4,100 years BP). Research on specimens from El Gigante reveals that ancient farmers selected for numerous traits, developing and cultivating a wide array of maize

This is the El Gigante rockshelter in the western highlands of Honduras.

 

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Mid-summer corn on the cob is everywhere, but where did it all come from and how did it get to be the big, sweet, yellow ears we eat today? Some of the answers come from carbon dating ancient maize and other organic material from the El Gigante rock shelter in Honduras, according to a team of anthropologists who show that 4,300 years ago maize was sufficiently domesticated to serve as a staple crop in the Honduran highlands.

Source: Maize from El Gigante Rock Shelter shows early transition to staple crop

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Original article:

News.psu.edu

A’ndrea Elyse Messer
April 10, 2017

 

UNIVERSITY PARK, Pa. — Reconstructed food webs from the Ancestral Puebloan southwestern United States show the complexity and interconnectedness of humans, other animals, crops and the environment, in an area of uncertain climate and resources, according to researchers, who think climate change and human decisions then, may shed light on future human choices.

“As southwestern archaeologists, we know that Ancestral Puebloan people were intrinsically connected to the environment,” said Stefani Crabtree, postdoctoral fellow in human behavioral ecology in the Department of Anthropology, Penn State. “But, most food webs have omitted humans.”

Traditionally, food webs, while they map the interaction of all the animals and plants in an area, usually do not emphasize the human component. Crabtree and colleagues created a digital food web that captures all categories of consumers and consumed, can be defined for specific time periods and can also represent food webs after major food sources or predators disappear from the area. If an area suddenly becomes devoid of deer or humans or corn, for example, a food web of that situation can show where predators went to find prey, or which prey thrived for lack of a predator.

These knockout food webs — webs missing a specific predator or prey — show the changes and pressures on the food sources substituted for the missing ones, or the changes that occur when pressure is removed by removing a major consumer. The researchers report the results of their study today (Apr. 10) in the Journal of Archaeological Science.

“When people show up in the area around A.D. 600 they bring corn,” said Crabtree. “It takes a while for critters to get used to it, but eventually, everything that eats vegetation, eats corn and prefers it.”

Humans bringing corn into an area is a major disruption of the existing food web. Planting corn means clearing fields to displace whatever plants and animals were there, creating a high-energy plant source of food and switching plant eaters to the preferred higher-calorie food source.

In the American Southwest, the Ancestral Puebloan people eventually preyed on their deer population enough so that they deer were no longer a reliable source of food. To compensate for this, they began to domesticate turkeys for food. Turkeys need to be fed corn if they are captive and that competes with corn for human consumption. At this time, corn made up 70 to 80 percent of Ancestral Puebloans’ food and so feeding turkeys altered the food web.

To create the food web, the team identified all the common, noninvasive species in the area. They then added species that were found in archaeological sites, but were absent from the modern lists. In some food webs, components are identified by their function, so all humming birds are considered flying pollinators, but in this case each type of humming bird received its own place in the web, linked to what it ate and what, if anything, ate it. This produced a very complicated web, but supplied exceptional redundancy.

 

“In the insect world it is harder to get at the data,” said Crabtree. “We have not been able to get at good databases so we aggregate at the functional level— pollinators or bloodsuckers for example.”

The exception to individual web entries then are invertebrates — insects, spiders, snails, etc. — that were classified by their function. Invertebrates are organized to the level of order and then grouped by function. With insects, for example, the researchers would group butterflies and moths that pollinated and sipped nectar, together in one group.

The overall food web had 334 nodes representing species or order-level functional groups with 11,344 links between predator and prey.

The researchers realize that there are differences in the environment between now and the Ancestral Puebloan period, but many things, such as pinon-juniper woodlands and sage flats are the same. Enough similarity exists for this approach to work.

The team did not produce just one overall food web, but also food webs corresponding to three archaeological locations and three time periods of Ancestral Pueblo occupation in the area — Grass Mesa Pueblo for Pueblo I, Albert Porter Pueblo for Pueblo II and Sand Canyon Pueblo for Pueblo III. They began with using archaeological assemblages from these sites incorporating all human prey and all human predators into the food web. Then they included the prey of the primary prey of humans and then predators of these human-prey species. Prey, in this case, includes animals, insects and plants.

When creating knockout food webs, the researchers included only those species that were found in reasonable quantities in the archaeological assemblages at those times.

“Knockout food webs are one of the best ways to understand how people interact with the environment,” said Crabtree. “Because we can remove something, predator or prey, and see what would happen.”

When major changes in climate variables such as drought, heat and lack of snowpack are factored in, the balance in the food web may become unstable. When food becomes scarce, most mobile creatures, animals and insects move to another location. During the time of the Ancestral Puebloans, this was possible and eventually, these people moved to the area of the Rio Grande in New Mexico and other places in New Mexico and Arizona.

“We didn’t have a long-term plan during the 600 years of Ancestral Pueblo habitation in the Mesa Verde region,” said Crabtree. “We don’t have a long-term plan today either. We don’t even have a four-year plan. Some people are pushing us to look closely at climate change.”

In the past, people migrated, said Crabtree. Unless we figure out better strategies, where are we going to migrate out to? We do not have a place to go, she said.

What people plant and eat has a great effect on the environment and on ecosystems. In the end, those choices will impact human survival, according to the researchers.

This work is part of a collaboration of researchers creating resolved food webs from a variety of places. Crabtree believes that she can compare this project to others that include humans in other geographical areas to help understand ecosystems with humans in them.

Also working on this project were Lydia J.S. Vaughn, graduate student, energy and resources group, University of California, Berkeley; and Nathan T. Crabtree, U.S. Forest Services.

The National Science Foundation and the Chateaubriand Fellowship funded this research.

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