Chapter 6: Ecosystems

Chapter 6: Ecosystems

Chapter 6: Ecosystems Section 3: Aquatic Ecosystems

A. Freshwater ecosystems include flowing and standing water, low or no salt

1. Rivers and streams flowing water a. Most

nutrients washed into the water

from land b. The faster the flow, the

greater the oxygen content

2. Lakes and ponds very little flow a. Sunlight warms and lights

pond bottom, supporting plant and animal life

b. Deeper lakes support life along shallow shoreline or surface

3. Water pollution a problem caused by fertilizer-filled runoff and sewage

4. Wetlands regions wet all or most of the

year a. Lie between

solid land and water b. Very fertile

ecosystems B. Salt water ecosystems 95% of Earths water

contains high concentration of salt, or high salinity

1. Open oceans divided into lighted and dark life zones

a. lighted upper 200m and home of plankton

b. dark below 200m where animals feed on material that floats down or prey on each other

2. Coral reefs diverse and fragile

ecosystems formed from coral shells of

calcium carbonate

3. Seashores along coastlines a. Intertidal zone covered with

water at high tide and exposed to air

at low tide b. Drastic changes in temperature, moisture,

salinity, and wave action 4. Estuaries where a river

meets an ocean; called bays, lagoons, harbors,

inlets, sounds Elkhorn Slough, CA

a. Rich in nutrients b. Changing mixture of salt water and freshwater

Healthy estuary Chesapeake Bay (largest estuary in the US)

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