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DO NOW

Obj : identify the factors that govern aquatic ecosystems. . DO NOW . List some of the areas that you know that contain water. . Aquatic Ecosystems . Determined primarily by the depth, flow, temperature, and chemistry of the overlying water.

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DO NOW

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  1. Obj: identify the factors that govern aquatic ecosystems. DO NOW List some of the areas that you know that contain water.

  2. Aquatic Ecosystems • Determined primarily by the depth, flow, temperature, and chemistry of the overlying water. • Grouped according to abiotic factors that affect them.

  3. Freshwater Ecosystems • Can be divided into two main groups: flowing and standing

  4. Flowing Water Ecosystem • Rivers, streams, creeks, and brooks are freshwater ecosystems that flow over land. • Originate in mountains or hills • Near the source there is plenty of oxygen but little plant life because the water is so turbulent.

  5. Standing-Water Ecosystem • Lakes and ponds are the most common • Provide a habitat for many organisms • Plankton: free-flowing organisms that live in both fresh and salt water

  6. Freshwater Wetlands • Wetland is an ecosystem in which the water either covers the soil or is present at or near the surface of the soil for at least part of the year. • Bogs, marshes, and swamps • Breeding ground for many insects and other organisms • Some are wet year-round while others are not covered all year.

  7. Estuaries • Formed where rivers meet the sea • Contain a mixture of salt and fresh water • Support a large amount of biomass • Salt marshes • Mangrove swamps

  8. Marine Ecosystems • Sunlight only penetrates a small distance through the water’s surface. • Upper level of the ocean known as the photic zone • Lower level known as the aphotic zone. • Also divided by distance from shore; intertidal zone, coastal ocean, and open ocean.

  9. Intertidal Zone • Organisms are exposed to regular and extreme changes

  10. Coastal Ocean • Extends from the low-tide mark to the outer edge of the continental shelf. • One of the most productive ocean communities is the kelp forest.

  11. Coral Reefs • Named for the coral animals whose hard, calcium carbonate skeletons make up their primary structure.

  12. Open Ocean • Sometimes called Oceanic Zone • Begins at the edge of the continental shelf and extends outward • Organisms are exposed to high pressure, frigid temperatures, and total darkness.

  13. Benthic Zone • Ocean floor • Contains organisms that attach to the bottom such as worms, sea stars, and anemones; called Benthos • Depend on food from organisms that grow in the photic zone

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