Printed from: https://conservationhandbooks.com/waterways-wetlands/waterway-and-wetland-ecology/the-productivity-scale/
The total weight or ‘biomass’ of life in any habitat is a measure of its productivity. Simple visual inspection of the type, variety and density of aquatic algae and of the higher plants growing at the water ’s edge gives a general idea of relative productivity. Different waterways can then be compared on a scale...