As summer progresses, the phytoplankton use up the nutrients in the epilimnion. It extends down as deep as sunlight penetrates. This ensures that the relative proportion of each habitat in any particular floodplain remains roughly constant over time and allows mobile species to move to find suitable new habitat. New Zealand lakes also support water fowl, including some found only around lakes. Another (Freshwater Withdrawals) looks at the amount of . In addition, plants often anchor themselves in nooks between rocks or where waters pool, to avoid the drag of the river water. The ducks have some unusual features which make them particularly adapted to their habitat. Four of the species have some individuals which spend their first few months at sea and then move into freshwater. The freshwater ecosystems they are one of the types of aquatic ecosystems that exist on planet Earth. Other large plants, like milfoil, water soldier, and water hyacinths also float on the surface of lakes and ponds. It feeds on detritus such as algal films and bacteria which it scrapes off rocks and wood with its pincers. They have scales that are easily dislodged, and give off a distinct cucumber smell. Some plants however can survive at considerable depths the deepest known plants are some species of bryophyte which have been found at depths of more than 70 metres in Lake Coleridge in Canterbury, where the water is particularly clear. Their flat shape decreases the currents' drag on them. In Encyclopedia of Climate and Weather, ed. Boston: WCB/McGraw-Hill, 1999. In this subtopic: Water use and environmental pressures // fresh water & quot ; large plants diatoms! 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