As the fish rests or sleeps, the coral reefs or mucus cocoon safeguard the fish against predators. This is also true in the case of young fish that use estuaries as their hiding spot until they have grown into capable and strong fish. An aquatic ecosystem includes a group of interacting organisms which are dependent on one another and their water environment for nutrients and shelter. Examples of aquatic ecosystem include oceans, lakes and rivers. United States Environmental Protection Agency (2 March 2006). "Marine Ecosystems" . Retrieved 25 August 2006.

All water bodies such as reservoirs, lakes, water streams, rivers, ponds, estuaries, wetlands, and sloughs, are considered aquatic habitations. There are two main types of habitats that are classified based on the level of saltiness or salinity. These include both habitats of freshwater and marine.Within the components of the aquatic habitat that make life in water possible, we can distinguish between: A decline in a macrophyte community may indicate water quality problems and changes in the ecological status of the water body. Such problems may be the result of excessive turbidity, herbicides, or salination. Conversely, overly high nutrient levels may create an overabundance of macrophytes, which may in turn interfere with lake processing. [1] Macrophyte levels are easy to sample, do not require laboratory analysis, and are easily used for calculating simple abundance metrics. [1] Potential sources of therapeutic agents [ edit ] Plant Adaptations to Aquatic Life". The Offwell Woodland & Wildlife Trust . Retrieved 8 February 2022.

Although most aquatic angiosperms can reproduce by flowering and setting seeds, many have also evolved to have extensive asexual reproduction by means of rhizomes, turions, and fragments in general. [7] Photosynthesis [ edit ]The marine habitat can be grouped into zones with regards to its varying water depths and shoreline features. These zones include: a b Shtein, Ilana; Popper, Zoë A.; Harpaz-Saad, Smadar (2017-07-03). "Permanently open stomata of aquatic angiosperms display modified cellulose crystallinity patterns". Plant Signaling & Behavior. 12 (7): e1339858. doi: 10.1080/15592324.2017.1339858. ISSN 1559-2324. PMC 5586356. PMID 28718691.

Neritic zone: These zone are present in mangrove swamps, lagoons, mudflats, marshes and meadows. The waters here aren't deep. Animals seen here are lobsters, clams, oysters, scallops, crab and shrimp.Smith, V. H. (1982). The nitrogen and phosphorus dependence of algal biomass in lakes: an empirical and theoretical analysis. Limnology and Oceanography, 27, 1101–12. Many fully submerged plants have finely dissected leaves, probably to reduce drag in rivers and to provide a much increased surface area for interchange of minerals and gasses. [17] The European and Mediterranean Plant Protection Organization has published recommendations to European nations advocating the restriction or banning of the trade in invasive alien plants. [43] See also [ edit ]