Impacts of sediment derived from erosion of partially-constructed road on aquatic organisms in a tropical river: The Río San Juan, Nicaragua and Costa Rica.

Average chlorophyll a was nearly two times higher on the north-bank than south-bank sites ( Fig 5 and Table 3 ), differences that were shown to be highly significant in ANCOVA tests; watershed area and percentage of forest cover did not explain the differences observed in periphyton biomass.

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