ORIGINS

Book: The Sixth Extinction

Just started reading The Sixth Extinction: An Unnatural History by Elizabeth Kolbert, a writer for The New Yorker. (Her previous book was Field Notes from A Catastrophe: Man, Nature, and Climate Change.)

The following few paragraphs from the Prologue give you an idea of the subject matter and her writing style. Here she traces our early history from our spread out of Africa to our modern ability to drill for energy and its Earth changing consequences:

Although a land animal, our species – ever inventive – crosses the sea. It reaches islands inhabited by evolution’s outliers: birds that lay foot-long eggs, pig-sized hippos, giant skinks. Accustomed to isolation, these creatures are ill equipped to deal with the newcomers or their fellow travelers (mostly rats). Many of them, too, succumb.

The process continues, in fits and starts, for thousands of years, until the species, no longer so new, has spread to practically every corner of the globe. At this point, several things happen more or less at once that allow Homo sapiens, as it has come to call itself, to reproduce at an unprecedented rate. In a single century the population doubles; then it doubles again, and then again. Vast forests area razed. Humans do this deliberately, in order to feed themselves. Less, deliberately, they shift organisms from one continent to another, reassembling the biosphere.

Meanwhile, an even stranger and more radical transformation is under way. Having discovered subterranean reserves or energy, humans begin to change the composition of the atmosphere. This in turn, alters the climates and the chemistry of the oceans. Some plants and animals adjust by moving. They climb mountains and migrate toward the poses. But a great many- at first hundreds, then thousands, and finally perhaps millions – find themselves marooned. Extinction rates soar, and the texture of life changes.

New insight on the origin of life?

Did metabolism developed near hydrothermal vents before the development of cellular life?  Image: Submarine Ring of Fire 2006 Exploration, NOAA Vents Program.

Did metabolism developed near hydrothermal vents before the development of cellular life?  Image: Submarine Ring of Fire 2006 Exploration, NOAA Vents Program.

Metabolism without cells? Metabolism before the development of RNA? A breakthrough discovery in the origin of life? Here is the introductory paragraph in a article in New Scientist describing a research study recently published in Molecular Systems Biology:

“Metabolic processes that underpin life on Earth have arisen spontaneously outside of cells. The serendipitous finding that metabolism – the cascade of reactions in all cells that provides them with the raw materials they need to survive – can happen in such simple conditions provides fresh insights into how the first life formed. It also suggests that the complex processes needed for life may have surprisingly humble origins.”

The research “team took early ocean solutions and added substances known to be starting points for modern metabolic pathways, before heating the samples to between 50˚C and 70˚C – the sort of temperatures you might have found near a hydrothermal vent – for 5 hours.”

Surprised by the findings, senior researcher Markus Ralser of the University of Cambridge commented:

“In the beginning we had hoped to find one reaction or two maybe, but the results were amazing. We could reconstruct two metabolic pathways almost entirely.”

An important new insight? Possibly. However, not everyone is convinced. Harvard University origin of life researcher Jack Szostak comments:

"Given the data, one might well conclude that any organics in the ocean would have been totally degraded, rather than forming the basis of modern metabolism. I would conclude that metabolism had to evolve, within cells, one reaction and one catalyst at a time."

Stay tuned. The study of acellular metabolism is likely just beginning.

Learn more  
Spark of life: Metabolism appears in lab without cells

Reference 
Nonenzymatic glycolysis and pentose phosphate pathwaylike reactions in a plausible Archean ocean

Hominins selected “healthy” places to live 500,000 to 100,000 years ago

Paleolithic handaxe. Image: José-Manuel Benito 

Paleolithic handaxe. Image: José-Manuel Benito 

There was plenty of real estate available in the Paleolithic. Hominins and early Homo sapiens probably choose sites according to many factors. Those choosing sites providing better nutritional opportunities were more likely to survive and create new generations.

The handaxe was an advanced Paleolithic tool used in procuring meat and tubers. By analyzing archeological sites on the British and French sides of the English Channel with a high number of handaxes (500 or more), researchers from the University of Southampton identified the types of sites preferred by hominins. Peter Franklin of University of Southampton writes:

“The high concentration of these artefacts suggests significant activity at the sites and that they were regularly used by early hominins.”

Lead author Professor Tony Brown, a physical geographer at the University of Southampton, commented on the study:

"Our research suggests that floodplain zones closer to the mouth of a river provided the ideal place for hominin activity, rather than forested slopes, plateaus or estuaries.

The floodplains provided "seasonal macronutrient advantages" and "could have provided foods rich in key micronutrients, which are linked to better health, the maintenance of fertility and minimization of infant mortality."

Professor Brown on the healthy nature of these sites:

"We can speculate that these types of locations were seen as 'healthy' or 'good' places to live which hominins revisited on a regular basis. If this is the case, the sites may have provided 'nodal points' or base camps along nutrient-rich route-ways through the Palaeolithic landscape, allowing early humans to explore northwards to more challenging environments."

John Oró

Sources

Related Posts

John Durant: Early agriculturalists adapted to pathogens

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John Durant's recently published book, The Paleo Manifesto, is excellent. Not a Paleo guide per se, but a wide-ranging look at the anthropology, history, and physiology underlining the Paleo approach to health. Transitioning from a hunter-gatherer lifestyle to farming was hard on human health. Durant on how humankind adapted:

Whether or not early agriculturalists realized it, many ancient cultural practices were adaptations against pathogens. For example, spices have antimicrobial properties, which made them a healthy addition to food in an era before refrigeration. It is not a coincidence that equatorial ethnic cuisines are particularly spicy (food spoils faster in hot climates) and recipes for meat dishes tend to call for more spices than do vegetables dishes (meat spoils faster than plants). Water in early cities was often filthy, which helps explain the emergence of sterile alternatives such as wine (microbes can’t survive in alcohol) and hot tea (boiling kills microbes). Early people didn’t know that invisible bacteria were causing cavities, but many still ended up using “toothbrushes” – wooden chewing sticks containing a natural antiseptic or treated with one.

Paleolithic People: The Pericú

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This public domain image is thought to represent two Pericú women. The Pericú, now extinct, were among the first inhabitants of the southernmost portion Baja California known as the Cape Region. Evidence of Pericú occupation dates back to 9000 B.P. The two figures in this image appear fit and the bow & arrow indicates involvement in hunting. Their diet included marine mammals, shellfish (evidenced by “enormous shell mounds”) and “terrestrial resources.” Possibly, the Pericú were descendants of the Paleolithic people living on the Channel Islands of southern California.

Related Entries

Quote: Obesity, Soft Drinks & Cognitive Decline

Although obesity may not be enough to warrant concern among parents, the lower academic potential of obese adolescents strongly argues for early treatment of childhood obesity and comprehensive intervention, including a limitation of sweetened soft drinks, especially those containing HFCS. Equally important is exploring the role of dietary omega-3 FAs, which appear to have beneficial effects on cognitive function and attenuate high-fructose associated cognitive decline.

The emerging role of dietary fructose in obesity and cognitive decline Nutr J. 2013; 12: 114.

 

HFCS: high fructose corn syrup
FA: fatty acids

The Arrow People: Catching a glimpse of Paleolithic man

Writer and journalist Scott Wallace joined an expedition deep into the Amazon "to track one of the planet's most isolated and dangerous indigenous tribes, the mysterious Arrow People." An excerpt of Wallace's book documenting the expedition, In Search of the Amazon's Last Uncontacted Tribes, was published in the Fall 2012 issue of Mizzou Magazine

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Expedition leader Sydney Possuelo, dedicated to encountering “vestiges of isolated tribes,” attempts to find and contact these rarely seen people. Describing what is known of the Arrow People, and “rapt with marvel and admiration,” he notes:

They live from hunting, fishing, and gathering.

To facilitate contact and communication with the tribe, Possuelo recruited members of friendly tribes. From Mizzou:

Much like Lewis and Clark’s exploration of North America 200 years earlier, the team includes members of three friendly tribes … to get information he needs to protect them.

Upon entering the Arrow People's land, the 34-member team found vestiges – palm leaves on the ground of a small clearing used as sleeping mats and partially eaten patuá fruit – but no signs of the “flecheiros.” They moved deeper into their territory. Suddenly, expeditioner Paulo Welker yelled:

Over here! Over here, they’re crossing the river!”

Soldado and Paulo Welker were heaving deeply, hands on their knees, by the time we reached the bluff above the river. Behind them rose the upended roots of an enormous tree that had fallen into the water. Another tree of similar dimension had fallen from the opposite bank, some 30 yards distant, an the two trunks met halfway across the river to form a single span, in the shape of a shallow V, like a bridge that had taken a direct hit in the midsection and had collapsed into the water. Vines had been strung between the barren branches that protruded vertically from the prostrate logs to form a makeshift handrail. Clearly, this was a regular transit point for the flecheiros.

“I saw one!” Welker gasped, still struggling to recover his breath. “He was naked, with long hair. Broad shoulders. Strong. He ran across the bridge. Disappeared into the woods.” He pointed across to the far side of the river.

Soldado had caught a glimpse of two flechieros (Arrow People) and added a detail: “They were naked – but for a string around their waists.”

The expeditioners left gifts signaling their wish to communicate, but there was no response and the threat was palpable. It would take time for the flecheiros to mobilized members from other villages. The expeditioners backed out of the area.

We stared across the river into the trees beyond the far bank. We saw nothing but the high wall of jungle, but we could feel their eyes upon us. All we could hear was the incessant flow of the water and the rush of the blood pounding in our ears. 

References

Lightly edited 8/16/20

The Anthropocene: The beauty & the beast

Humankind is now the most powerful force on the planet. Although when it began is debated , many geologists believe we are in a new geological epoch: the Anthropocene – the age of humankind.

The recent Planet Under Pressure conference commisioned a video of the Anthropocene over the past 250 years. The video comes in two versions. The version above, described as "mesmerizing," can be viewed as illustrating some of the beauty of our time.

However, the narrated version below shows the beast. Keep in mind, there are solutions.

When did Paleo-Indians arrive in North America?

The first Paleo-Indians (AKA Paleo-Americans) are believed to have reached the western hemisphere around 14,000 years ago by crossing Beringia, the landmass then connecting Asia to Alaska. (A recent, though controversial analysis, suggests humans reached North America earlier by crossing the north Atlantic ice.)

Now, new findings at an ice age fossil site near Snowmass Village, Colorado hint at possible human migration to North America many thousands of years earlier. Following the sites discovery by a construction worker in October 2010, researchers have recovered 4,800 fossils including a Columbian mammoth. Interestingly, the most curious findings were “soccer ball-sized stones.” According to aspendailynewsonline:

The possible presence of Paleo-Indians arose when Drs. Kirk Johnson and Ian Miller, co-leaders of the dig, and others noticed small boulders where they shouldn’t have been. Several soccer ball-sized stones were found in what was once the middle of the ancient lake. The rocks were next to, above and below a partial mammoth skeleton, Johnson said Wednesday.

The stones may be evidence of mammoth hunting by Paleolithic humans. However, there is one problem: as far as we know, humankind was not in the western hemisphere at that time! The ice-age fossils are “estimated to be between 40,000 and 150,000 years old.” This would put humans in North America 26,000 years earlier than current evidence indicates.

Currently at the Denver Museum of Nature & Science, the animal fossils will be studied extensively including searching for marks that would indicate butchering by humans. If they are found, it will dramatically rewrite the history of human migration during the Middle Paleolithic.

Related Post

Rare look at Paleoindian burial, housing, and nutrition

Carnivory shortened breast-feeding periods during human evolution

A recent news report on the impact of carnivory in human evolution begins with a blunt statement:

Carnivory is behind the evolutionary success of humankind. 

Hunting is known to have been a crucial event in human evolution. According to Science Daily:

Learning to hunt was a decisive step in human evolution. Hunting necessitated communication, planning and the use of tools, all of which demanded a larger brain. At the same time, adding meat to the diet made it possible to develop this larger brain.

However, developmental psychologist Elia Psouni, lead author of a new report published in PLoS ONE, points to another crucial role of carnivory:

... the strong connection between meat eating and the duration of breast-feeding... Eating meat enabled the breast-feeding periods and thereby the time between births, to be shortened. This must have had a crucial impact on human evolution."

Learn more at Science Daily and PLoS ONE.

Those Upscale Neanderthals: Cave paintings, Eagle talon ornaments, and Seafaring boats?

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Cueva de Nerja. Image: Luzzyacentillo, Wikimedia Commons

Cave Paintings

Did Neanderthals paint images of seals on cave walls near Malaga, Spain? If so, it would be a stunning find. Our Homo sapiens ancestors created the oldest previously known cave paintings 30,000 years ago: the beautiful Chauvet paintings in southern France. The newly discovered paintings in the Nerja Caves near Malaga in southern Spain are, surprisingly, estimated to be around 43,000 ago - 13,000 years older than those of Chauvet.

However, there is one small problem: as far as we know, Homo sapiens was not known to be in that region of Spain 43,000 years ago. This strongly suggests Neanderthals created the paintings and thus possessed imagination and skill not previously attributed to them.

The paintings are believed to represent seals that would have been part of the Mediterranean Neanderthal diet. The seal paintings and additional views of the cathedral-like Nerja Caves can be seen here.

Researchers will attempt to confirm when the paintings were created by determining the age of the pigments. Some specialists caution Homo sapiens may have been in southern Spain during that time after all and could have painted the images.

Eagle Talon Ornaments

Recent evidence discovered by researchers from Trent University in Ontario, Canada and the Université Bordeaux in France suggests Neanderthals wore eagle talons as ornaments or jewelry. According to the researchers:

"… it seems reasonable to argue that Neanderthals in France and Italy regularly used terminal phalanges of birds of prey. … One possibility is that they were used as ornaments...”

The abstract published in PlosOne concludes:

Here we show that, in France, Neanderthals used skeletal parts of large diurnal raptors presumably for symbolic purposes… The presence of similar objects in other Middle Paleolithic contexts in France and Italy suggest that raptors were used as means of symbolic expression by Neanderthals in these regions.

Images of the eagle talons are here

Seafaring Boats

Not only could Neanderthals have painted images on caves walls and made talon ornaments, they may have also built seafaring boats!

Neanderthal stone tools have been found “on the Greek islands of Lefkada, Kefalonia and Zakynthos.” Until recently, it was believed that these islands were connected to the mainland during the Paleolithic which would have allowed Neanderthals to spread there easily. Now, researchers at the University of Patras in Greece believe they have ruled out this option. In a study published in the Journal of Archeological Science, the researchers found that “…when Neanderthals were in the region, the sea would have been at least 180 metres deep.”

If Neanderthals indeed reached these Mediterranean islands by boat, their seafaring would have reached distances from 5 to 12 kilometers from shore. They may have also reached Crete, an impressive 40-kilometer journey. How Neanderthal seafaring may have developed is suggested in the abstract:

Seafaring most likely started some time between 110 and 35 ka BP and the seafarers were the Neanderthals. Seafaring was encouraged by the coastal configuration, which offered the right conditions for developing seafaring skills according to the “voyaging nurseries” and “autocatalysis” concepts.

Neanderthals painting in cavernous cathedral-like caves, wearing furs and talon necklaces, feasting on seafood, and paddling boats in to reach pristine Mediterranean islands - now that's a new image of these “cave men.” Being called a Neanderthal may become upscale. 

Quote: On the origins of farming at the end of the last Ice Age

As the human species epxanded across the globe, we had to compete with other animals going for the easy food. We went for things like the small hard grass seeds we call cereals, which are indigestible if eaten raw and may even be poisonous, which we have to pulp up and turn into things like bread and dough. And we went into the poisonous giant tubers, like the yam and the taro, which also had to be leeched, ground up and cooked before we could eat them.

Martin Jones, Professor of Archaeological Science, Cambridge University

via A History of the World in 100 Objects 

Book Review: Before the Dawn

By John Michael

BeforeTheDawn.jpg

The premise of the Paleo diet, that we should eat the foods we were designed to eat, is founded upon the ideas of evolutionary biology. But for many of us, the science of evolutionary biology is, if not a complete mystery, then only a vaguely understood concept.

In Before the Dawn, (2006) Nicholas Wade, a science writer for the New York Times, guides the reader through the history of human development, starting with the first hominids, and then continuing until the present day, with an interesting glance at evolutionary changes that have occurred in the human genome since the Neolithic, when humankind began to leave behind their hunter-gatherer life and took up a settled agricultural existence.

Why does this book matter to Paleo dieters? For one thing, the better informed we are of our evolutionary heritage, the easier it is for us to make the right decisions concerning our bodies, and this book covers the spectrum of human evolutionary history, from the development of the nose, to the appearance of the pair bond among couples.

Most importantly, Wade talks about what distinguished behaviorally modern humans, who appeared around 50,000 years ago by his count, from those hominids who came before them.

"The bringers of the new culture made personal ornaments, of materials such as punctured teeth, shells and ivory beads. They played bird-bone flutes. Their missile technology was much improved. They were avid hunters who could take down large and dangerous game. They buried their dead with rituals. They could support denser populations. They developed trade networks through which they obtained distant materials." 

The distinction that Wade makes shows us how these ancient peoples might be models for modern life, and how they might not. The importance they attached to music, dancing, spirituality, and art, for example, could inform our own modern Paleo lifestyles, while their near universal practice of constant warfare would perhaps best be left in the past. Finally, in keeping with Paleoterran's mission, Before the Dawn offers knowledge of how the Earth formed us, which can foster a deeper sense within us of our connection to this planet, and so reveal yet again what should already be a common truth: that the health of this planet and our own are intimately connected, at such a depth that the welfare of one is indistinguishable from the welfare of the other.

Quote: Agriculture's toll on health

When populations around the globe started turning to agriculture around 10,000 years ago, regardless of their locations and type of crops, a similar trend occurred: The height and health of the people declined.

Carol Clark
eScienceCommons
Dawn of agriculture took toll on health 

also see Early Farmers Were Sicker and Shorter Than Their Forager Ancestors