Another study compared sediments from four reservoirs. Central reservoirs showed evidence of problematic mercury contamination and cyanobacteria; findings varied between the basins.
Evidence / source: Lentz et al. · Scientific Reports 10, 10316 (2020)Water supply therefore involves more than storage volume. Location, catchment and use can affect quality. Looking only at a temple misses relationships between urban design and supply. Studying one reservoir, conversely, cannot automatically tell us about the entire city.
What the evidence cannot establish on its own
These findings raise questions about environmental pressures. They do not by themselves establish a single explanation for Tikal’s political and demographic changes.