15.5 Estuaries and Freshwater Ecosystems KEY CONCEPT Freshwater

15.5 Estuaries and Freshwater Ecosystems KEY CONCEPT Freshwater ecosystems include estuaries as well as flowing and standing water. 15.5 Estuaries and Freshwater Ecosystems 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 15.5 Estuaries and Freshwater Ecosystems Estuaries are highly productive ecosystems.

Estuaries provide a protected refuge for many species. birds migration spawning grounds Estuaries are primarily threatened by land development. 15.5 Estuaries and Freshwater Ecosystems 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 rivers course 15.5 Estuaries and Freshwater Ecosystems 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. 15.5 Estuaries and Freshwater Ecosystems

Ponds and lakes share common features. Freshwater bodies are divided into three zones. littoral zone limnetic zone benthic zone 15.5 Estuaries and Freshwater Ecosystems

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.

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