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

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.

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

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

  2. 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

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

  4. 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

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

  6. Ponds and lakes share common features. • Freshwater bodies are divided into three zones. • littoral zone • limnetic zone • benthic zone

  7. 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. • All lakes “turn over” periodically.

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