such as ?oodplains and temporary ponds) challenge this de?nition. Our decision has been to include such The term 'aquatic macrophytes' refers to a diverse species as ''aquatic macrophytes'', only if their group of aquatic photosynthetic organisms, all large environmental survival is clearly dependent upon enough to see with the naked eye. It includes regular re?lling of their aquatic habitat with a source macroalgae of the divisions Chlorophyta (green of fresh to brackish water. algae), Xanthophyta (yellow-green algae) and Rho- The freshwater macroalgae are primarily rep- dophyta (red algae)...