1. Aquatic Ecology Review
Unit 3 – AP Environmental Science

2. A porous, spongelike layer of rock, sand, or gravel that is capable of holding water

3. A measure of the density of suspended particles (lack of clarity) in a water supply

4. The fish in the lake at the local park are dying
The fish in the lake at the local park are dying. A professor from the local college comes to investigate, and first she measures the dissolved oxygen because she wants to check for the ________.
A) presence of heavy metals
B) presence of bacteria
C) possibility of eutrophication
D) aquatic biodiversity
E) influence of acid precipitation

5. A key characteristic of aquatic dead zones is ________.
A) a high concentration of organisms resulting in extreme competition and finally the death of most
B) a low concentration of keystone species
C) a high concentration of urban development
D) a low concentration of oxygen
E) a low concentration of nitrogen and phosphorus nutrients

6. Ecosystem that lies along the shoreline between the farthest reach of the highest tides and the lowest reach of the lowest tide

7. Tree-dominated ecosystem in tropical and subtropical latitudes that consists of gently sloping sandy and silty coastal areas

8. Area where a river flows into the ocean, mixing fresh water and saltwater

9. Ocean water is saltiest ________.
A) where there is a large amount of glacial melting
B) where rains are the heaviest
C) where there is high evaporation and low precipitation
D) in estuaries
E) at the equator

10. The area that underlies the shallow water bordering continents is called the ________.
A) pycnocline
B) topographic shelf
C) continental shelf
D) bathymetric zone
E) surface zone

11. What are groundfish?
A) fish that form the base of the food web of deep-water habitats
B) various species that live in benthic habitats, such as halibut, cod, and flounder
C) various species that live in littoral habitats, such as tuna, grouper, and whitefish
D) various species that are found in estuaries
E) fish that are ground up and used for bait or fish food

12. Zooxanthellae are ________.
A) an endangered species of fish in the Pacific Ocean
B) symbiotic bacteria that decompose tissues of dead animals in oceans
C) symbiotic bacteria that fix nitrogen in oceans for corals
D) symbiotic algae that provide corals with energy via their photosynthetic activity
E) an invasive species of kelp in the Indian Ocean

13. As water warms, it ________.
A) decreases in density, rising to the surface
B) decreases in temperature
C) sinks
D) dissolves increased amounts of Oxygen from the atmosphere
E) becomes more alkaline

14. Upwelling ________. A) occurs in areas where there are no currents
B) is the flow of warm water up toward the ocean surface
C) results in areas of high primary productivity at the ocean surface
D) occurs where winds blow at right angles toward the coastline
E) transports oxygen up toward the ocean surface

15. Hydrothermal vents ________.
A) create ocean currents
B) provide chemicals to symbiotic bacteria that support ecosystems at the ocean floor
C) occur in tropical areas at the ocean surface
D) make the photic zone of ocean pelagic areas the most productive
E) are passageways for fish within coral reefs

16. Salt marshes ________.
A) contain too much salt to be inhabited by many organisms
B) occur mostly in tropical areas
C) occur mostly in arctic areas
D) occur mostly in temperate areas
E) presently have remained undisturbed by human activities

17. THE END! GOOD LUCK STUDYING!!! 