chapter_7_reading_guide (1).docx - Chapter 7 Aquatic...

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Chapter 7, Aquatic Ecosystems: Section 1, Freshwater Ecosystems Freshwater Ecosystems The types of organisms in an aquatic ecosystem are mainly determined by the water’s _____ salinity__ . As a result, aquatic ecosystems are divided into ___ freashwater and marine _____ ecosystems. Freshwater ecosystems include ponds, lakes, streams, rivers, and wetlands. ___ wetland___ are areas of land that are periodically underwater or whose soil contains a great deal of moisture. Characteristics of Aquatic Ecosystems Factors such as _ temperature, sunlight, oxeygen, and nutrients _ determine which organisms live in which area of the water. Aquatic ecosystems contains several types of organisms that are grouped by their _______ locations______ and by their ___adaptions____ . Three groups of aquatic organisms include ___plankton,nekton, and benthos____ . ___plankton____ 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. __nekton__ are all organisms that swim actively in open water, independent of currents. ____benthos___ are bottom-dwelling organisms of the sea or ocean and are often attached to hard surfaces. __decomposers__ are also aquatic organisms. Lakes and Ponds Lakes, ponds, and wetlands can form __naturally__ where groundwater reaches the Earth’s surface. Humans intentionally create _artificial lakes__ by damming flowing rivers and streams to use them for power, irrigation, water storage, and recreation. The types of organisms present depend on the ___amount of sunlight___ available. Life in a Lake The __littoral zone__ 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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