A new study published in *Science Advances* reveals that mercury contamination from cinnabar was heavily concentrated at the ancient urban centers of Coba and Xcach. The toxic runoff devastated local freshwater biology, sharply reducing or wiping out populations of algae, cyanobacteria, bacteria, midges, and shelled organisms. While the heavy metal cannot be definitively identified as the primary catalyst for the abandonment of Maya cities, it likely harmed human health through fish consumption and water supplies. Contamination levels repeatedly broke modern toxicology thresholds between 125 AD and 820 AD, compounding severe pressures like climate change and warfare.
Key points
Severe mercury contamination persisted intermittently across the region for centuries, sp…: Severe mercury contamination persisted intermittently across the region for centuries, spanning from 125 AD through 820 AD.
Toxic mercury traveled through aquatic food chains, exposing local residents to health ha…: Toxic mercury traveled through aquatic food chains, exposing local residents to health hazards involving kidney, brain, and lung damage.
The heavy metal contamination acted as an additional environmental stressor alongside cli…: The heavy metal contamination acted as an additional environmental stressor alongside climate change and regional warfare during the Classic Period.
Sources checked by our analysis pipeline: 1
Nov 6 : For the ancient Maya, the vibrant red mineral cinnabar held deep sacred meaning, representing blood, life and the soul. They used it widely as pigment in murals and temples while also employing it in ceremonies and funerary rites. What they did not know is that cinnabar is mostly mercury, which can be highly toxic.
Previous research showed how mercury from cinnabar left enduring contamination at the sites of certain ancient Maya cities such as Tikal in Guatemala. A new study reveals that this contamination was more widespread than previously known and documents how mercury, after leaching into the surrounding soil and bodies of water, proved deadly for many aquatic organisms.
Researchers obtained core samples from beneath lakes at two ancient Maya cities on Mexico's Yucatan peninsula — the well-studied site of Coba and the little-known site of Xcach.
The samples showed a mercury spike at Coba beginning around 250 AD and lasting about 150 years around the outset of the golden age of Maya civilization, called the Classic Period. At Xcach, there was a spike from around…
Investigators are advancing prenatal molecular editing to repair defective genes before blood vessel barriers fully mature and restrict therapy access. Recent animal models demonstrate that early intervention allows treatment packages to reach vital muscular targets, potentially offering a path to halt fatal conditions prior to delivery. This minimally invasive strategy bypasses standard viral vectors by utilizing safer synthetic carriers injected directly into the umbilical vein.
Researchers analyzing the limb bones of an ancient Brazilian theropod have detected chemical signatures of hemoglobin-derived heme molecules and collagen-linked amino acids. The discovery challenges established scientific assumptions regarding the maximum survival lifespan of fragile biological structures. These insights suggest that properly preserved fossils could hold overlooked molecular records that aid in studying extinct species and extraterrestrial life.
Researchers documented an unusual case of colony survival where an isolated population persevered despite complete entrapment. The insects sustained themselves solely by consuming fellow colony members over an extended period. This observation highlights extreme dietary adaptation under conditions of total environmental confinement.