| A | B |
|---|
| Explain why the term “filter feeder” is used to describe oysters. | Oysters filter sediment and nutrients from water as they feed. |
| Give one benefit and one cost to limiting fish catches in the Chesapeake Bay. | Limiting fishing would give the ecosystem a chance to rebound, but it would harm the people that make a living from catching fish |
| Water can separate into layers called thermoclines and haloclines based upon its physical properties. What physical property is a halocline based on? | Density |
| Fish need oxygen for cellular respiration. Where do they get this oxygen? | Oxygen is produced by submerged aquatic vegetation |
| Every species of fish has a temperature preference where it survives best. Salmon prefer cold water. In what part of estuary waters would you expect to find salmon in the summer months | Near the bottom of the estuary |
| True or false An estuary drains into a watershed. | False |
| Why is the Chesapeake Bay a natural sink for many elements and compounds | Elements and compounds are present in sediment that falls to the bottom of the Bay when river water enters the Bay and slows down. |
| True of False Estuarine ecosystems can be restored by adding more nutrients to the water. | False |
| List three important abiotic factors in an estuarine ecosystems | 1. Dissolved Oxygen 2. Turbidity 3. Salinity |
| Pine, cedar, ash, and oak trees were planted along the edges of a river in Oregon. What do you predict will be the effect of these riparian trees on the turbidity of the water? | The turbidity of the water should decrease with the presence of the trees |
| Explain how aquaculture can help restore the Chesapeake Bay | Fewer fish will need to be caught from the estuary if many of the fish that people eat are raised in farms. Over-fishing will be prevented and the fish populations will increase |
| Give an example of a body of water with high salinity | Ocean |
| Give an example of a non-point source of polution | Erosion of soil into a body of water |
| List three things provided by estuaries | 1. wetland habitat 2. Pitstops for migratory birds 3. Filter feeders |
| How does erosion of shoreline soil affect water quality? | It increases sediment in the water |
