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.
Dec 14, 2015
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.
Human Dependenceand Modification
2 Major Systems:
•Ocean currents
•Ocean food webs
Human Modifications
Run Off and Pollution-Phosphorus/Nitrogen• Too much fertilizer used in
farming• Too much algae growth
-Harmful Algal Blooms“Red Tides”
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
Shark Fins
Human Modifications
Artificial Reefs• human-made underwater structure, typically
built for the purpose of promoting• marine life• Texas Clipper
Human Dependence
We depend on the ocean for:
1. Oxygen!• Phytoplankton
contribute 70-80% of the oxygen to Earth’s atmosphere.
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
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
October 2, 2013
• What is the result in the relationship between mussels as the zebra mussel invades Texas lakes?
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.
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
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
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