Lake with a large or excessive supply of plant nutrients, mostly nitrates and phosphates.
A nutrient-poor, clear, deep lake with minimum phytoplankton.
the relative proportion of salt in a solution
portion of the shoreline that lies between the high and low tide lines
the wide part of a river where it nears the sea
the deep sea (2000 meters or more) where there is no light
the steep descent of the seabed from the continental shelf to the abyssal zone
a reef consisting of coral consolidated into limestone
photosynthetic or plant constituent of plankton
moderate amounts of nutrients, moderate phytoplankton productivity
Lands covered with fresh water all or part of the time (excluding lakes, resercoirs, and streams) and located away from coastal areas
associated with ocean bottom
Upper layer of a body of water through which sunlight can penetrate and support photosynthesis.
a long narrow sandy island (wider than a reef) running parallel to the shore
animal constituent of plankton
overnourishment of aquatic ecosystems with plant nutrients because of human activities such as agriculture, urbanization, and discharges from industrial plants and sewage treatment plants
smaller recently discovered and poorly understood producers that are types of plankton that are smaller than 10 microns
flood plain zone
area of rivers which empty into the ocean
water that flows over the ground surface rather than soaking into the ground
aquatic life zone
Marine and freshwater portions of the biosphere. Examples include freshwater life zones (such as lakes and streams) and ocean or marine life zones (such as estuaries, coastlines, coral reefs, and the deep ocean).
Headwater or mountain highland streams of cold, clear water rush over waterfalls and rapids
headwater merge from wider, deeper streams that flow down gentler slopes with fewer obstacles
a ridge of land that separates two adjacent river systems
Warm, nutrient-rich, shallow part of the ocean that extends from the high-tide mark on land to the edge of a shelflike extension of continental land masses known as the continental shelf.