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Human Dependence on Oceans

Human Dependence on Oceans

Runoff

The more houses and roads we build creates impermeable surfaces (such as concrete and pavement) that do not allow filtering of water down through the soil and into the aquifer where ground water is stored.

Negative Impact

introduction of marine pests

Can pick up pollution along the way

8:11D Recognize human dependence on ocean systems and explain how human activity such as runoff, artificial reefs, or use of resources have modified these systems.

oil spills

Over fishing

runoff

pollution and dumping

commercial harvesting

Instead the water is forced directly into the water source such as a river, lake, or ocean usually carrying pollutants with it.

Positive Impact

artificial reefs

restoration of habitat

http://www.edwardsaquifer.net/barton.html

skip to 2:00

Runoff Simulation

http://gtm-media.discoveryeducation.com/videos/dsc/externalApplications/simulations-es/Explorations/Content/Resources/LS_7_2_3_Short-Term_Changes/flash/LS_7_2_3_Short-Term_Changes.html

Artificial Reefs

How do we depend on oceans?

Runoff is the flow of water that occurs when the soil is saturated and excess water from rain, or other sources, flow over the land and can accumulate in rivers, lakes, and oceans.

Artificial reefs are man made underwater structures built to promote marine life in areas that typically have a flat, featureless bottom

Algae and invertebrates such as coral, oysters, and barnacles, can attach to the reefs. As they grow, reefs provide a structure for habitats and food.

Humans depend on oceans for many reasons including food, transportation, energy sources, and recreation.

They can be intentional by placing unused or non-working structures that were once used for other purposes such as old automobiles, buses, train cars, and oil rigs down to the ocean floor

Concerns

These concerns include toxicity of some man-made structures, damage to some natural ecosystems, and even worsening the effects of overfishing by accumulating fish into one area.

Human activities play an important role in changing the environment of the oceans

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