8.11D - Recognize human dependence on ocean systems and explain how human activities such as runoff,...
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Transcript of 8.11D - Recognize human dependence on ocean systems and explain how human activities such as runoff,...
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8.11D - Recognize human dependence on ocean systems and explain how human activities such as runoff, artificial reefs, or use of resources have modified theses systems.
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Human Dependenceand Modification
2 Major Systems:
•Ocean currents
•Ocean food webs
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Human Modifications
Run Off and Pollution-Phosphorus/Nitrogen• Too much fertilizer used in
farming• Too much algae growth
-Harmful Algal Blooms“Red Tides”
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Over-fishing -Harvesting a fish population to a point of diminishing returns
•Disrupts the food web•May cause organisms to
migrate to other areas
Human Modifications
http://www.youtube.com/watch?v=F6nwZUkBeas
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Shark Fins
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Human Modifications
Artificial Reefs• human-made underwater structure, typically
built for the purpose of promoting• marine life• Texas Clipper
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Human Dependence
We depend on the ocean for:
1. Oxygen!• Phytoplankton
contribute 70-80% of the oxygen to Earth’s atmosphere.
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Human Dependence
We depend on the ocean for:2. Weather
• The oceans absorb a lot of energy from the sun.
• Warmer water = more evaporation = more rain
• Cooler water = less evaporation = less rain
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Human Dependence
We depend on the ocean for:3. Food
•Seafood provides a lot of world’s protein.4. Transportation
•most of the worlds goods are transported by ship
5. Recreation•Many countries main source of income is
through ocean tourism
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October 2, 2013
• What is the result in the relationship between mussels as the zebra mussel invades Texas lakes?
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Mangrove SwampsBiodiversity
• Biodiversity• Produce seafood, fruits,
medicines, fiber, and wood. • Stabilize shores by trapping
sediments and building land.• Improve water quality by
filtering runoff and polluted waters.
• Protect the climate by absorbing carbon dioxide and reducing the amount of greenhouse gas.
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Estuaries – where freshwater streams and rivers flow into ocean
• Biodiversity• Recreational Fishing• Shellfish Breeding
Grounds• Protection from Flood
Waters• Filter Runoff• Environmental,
Commercial, and Recreational Benefits
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Human Impacts on Ocean Systems• Coastal Development• Aquaculture (fisheries)• Commercial & Recreational Fishing• Burning of Fossil Fuels• Deforestation• Introduction of Invasive Species• Agricultural Waste and Pollution• Oil Spills• Trash Pollution• Urban Runoff via Storm Drains• Raw Sewage Pollution• Industrial Pollution
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Consequences• Extreme Storms• Dead Zones• Ocean Acidification• Human Displacement• Collapsed Fisheries• Habitat Destruction• Change in Precipitation & Weather Patterns• Disrupted Gas Storage and Exchange• Human Health Issues• Extinction and Loss of Biodiversity• Siltation• Garbage Patches