Presentation on theme: "8.11D - Recognize human dependence on ocean systems and explain how human activities such as runoff, artificial reefs, or use of resources have modified."— Presentation transcript:
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 Dependence and 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
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 Swamps Biodiversity 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