New findings offer explanation as to why Mayans abandoned their cities: [sciencealert.com]
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The contaminated water sources idea makes a whole lot of sense since still or stagnated water aids theses algal blooms immensely and it seems that the Mayans relied mostly on rainfall to keep these 'reservoirs' topped up, so to speak.
Without a constant in-flow of fresh water from feed streams, rivers and such the waters would soon become contaminated, have massive algal blooms and the run-off from the city, etc, would have contained numerous toxic elements such a mercury, etc, dissolved in the run-offs, collecting, remaining and increasing exponentially over time.
A somewhat poignant example is what occurred in the Darling River, N.S.W. Australia just recently where a Blue Green Algal Bloom in the very still and stagnant waters ( caused by a complete lack of fresh water flows for well 2 years) there caused the deaths of millions of fish species, I saw, first-hand, what it was like, the water was very much like a foul, stinking version of Green Pea Soup for as far as the eye could see both up-stream and down-stream.
Triphid
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