Estuaries are dynamic environments where rivers flow into the ocean.

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Presentation transcript:

KEY CONCEPT Freshwater ecosystems include estuaries as well as flowing and standing water.

Estuaries are dynamic environments where rivers flow into the ocean. An estuary is a partially enclosed body of water. mixture of fresh water with salt water Chesapeake Bay Louisiana bayous

Estuaries are highly productive ecosystems. Estuaries provide a protected refuge for many species. birds migration spawning grounds Estuaries are primarily threatened by land development.

Freshwater ecosystems include moving and standing water. A watershed is a region of land that drains into a body of water. Ecosystems may be different along a river’s course

Wetlands are among the most productive ecosystems. provide a home for many species filter dirty water renew underground water supply Some animals have adaptations suited to the freshwater they inhabit.

Ponds and lakes share common features. Freshwater bodies are divided into three zones. littoral zone Shoreline, lots of light, warm water limnetic zone Open water, lots of fish benthic zone Bottom, little sunlight, decomposers

All lakes “turn over” periodically. Turn over happens due to changes in density. In both autumn and spring, surface water flows downward and bottom water flows upward. The upwelling brings up nutrients.