chapter_7_lecture_guide.docx - Chapter 7 Aquatic Ecosystems...

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Chapter 7, Aquatic Ecosystems: Section 1, Freshwater EcosystemsFreshwater Ecosystems The types of organisms in an aquatic ecosystem are mainly determined by the water’s _______________________________________________. As a result, aquatic ecosystems are divided into _______________________________________________ ecosystems.Freshwater ecosystems include ponds, lakes, streams, rivers, and wetlands._______________________________________are areas of land that are periodically underwater or whose soil contains a great deal of moisture.Characteristics of Aquatic EcosystemsFactors such as ______________________________________________________________determine which organisms live in which area of the water.Aquatic ecosystems contains several types of organisms that are grouped by their _____________________________________and by their _____________________________________.Three groups of aquatic organisms include ____________________________________________________________.________________________________________ are the mass of mostly microscopic organisms that float or drift freely in the water, and can be microscopic animals called zooplankton or microscopic plants called phytoplankton.________________________________________ are all organisms that swim actively in open water, independent of currents.________________________________________ are bottom-dwelling organisms of the sea or ocean and are often attached to hard surfaces.________________________________________are also aquatic organisms.Lakes and Ponds Lakes, ponds, and wetlands can form ______________________________________where groundwater reaches the Earth’s surface.Humans intentionally create ______________________________________________by damming flowing rivers and streams to use them for power, irrigation, water storage, and recreation.The types of organisms present depend on the _____________________________________________________ available.
Life in a Lake The ________________________________________________________is a shallow zone in a freshwater habitat where light reaches the bottom and nurtures plants and aquatic life is diverse and abundant.

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