Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Pollution infiltration Figure 10.26

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Oxygen sag Figure Infectious Agents - bacteria, viruses, parasites -> animal/human waste

Eutrophication - enriched in nutrients and biological activity

Inorganic Pollutants Leadville, Colorado

Summitville, Colorado

Irondequoit Bay on Lake Ontario just east of Rochester 6.6 km long body of water linking Irondequoit Creek at the south to Lake Ontario in the north Primary water inflow is the creek, other important sources are surface runoff and storm sewer discharge

Areas of Concern for the Bay Algal blooms and eutrophication contamination by sewage bluff erosion and landslides Sodium Chloride loading during the winter months due to highway salting Loss of wetlands

Areas of Concern for the Bay Changes in aquatic community Increase in power boating activity 1990s invasion of zebra mussels Saltwater incursion of Webster well field

Zebra Mussels Discovered in North America in Marine biologists believe it arrived by transatlantic ship-an undetected stowaway in ballast water that was discharged, mussel larvae and all, into Lake St. Clair, between Lakes Huron and Erie. Since then, the prolific creature has spread rapidly throughout lakes and waterways of the eastern United States and Canada, from the Great Lakes through the Mississippi River drainage. It remains unchecked by predators or parasites.

Zebra Mussels

Chemical Degradation

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Watershed degradation Figure 10.23

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Oil pollution in the oceans Figure 10.28