1. Ocean Systems: Human Dependence and Modification

2. Human Dependence and Modification 2 Major Systems: Ocean currents Ocean food webs

3. Human Dependence We depend on the ocean for: 1.Weather The oceans absorb a lot of energy from the sun. Warmer water = more evaporation = more rain Cooler water = less evaporation = less rain

4. Human Dependence We depend on the ocean for: 2.Food Seafood provides a lot of world’s protein. 3.Transportation most of the worlds goods are transported by ship 4.Recreation Many countries main source of income is through ocean tourism

5. 1.Over-fishing Disrupts the food web May cause organisms to migrate to other areas Human Modification

6. 2. Artificial Reefs human-made underwater structure, typically built for the purpose of promoting marine life Texas ClipperTexas Clipper – (9 min)

7. Human Modification 3.Run Off and Pollution - Phosphorus/Nitrogen Too much fertilizer used in farming Too much algae growth - Harmful Algal Blooms “Red Tides”