Sample Aquatic Ecology Questions

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1. A lake ecosystem is termed “phosphorous limited” if:

a. adding nitrogen to the lake causes increased phytoplankton growth
b. adding phosphorus to the lake causes increased phytoplankton growth
c. adding nitrogen to the lake causes decreased phytoplankton growth
d. adding phosphorus to the lake causes decreased phytoplankton growth
e. adding phosphorus to the lake causes no change in phytoplankton growth

2. Pacific salmon (Onchorhyncus spp.) are an example of the “anadromy” life history because they do which of the following:

a. fish spend most of their lives in freshwater and then migrate to the sea for breeding
b. fish spawn in freshwater but juveniles drift back to the ocean where adults spend most of their lives
c. adult female fish die immediately after spawning
d. adults can metamorphose from male to female under high density pressures
e. none of the above

3. Which of the following would NOT be considered a benthic macroinvertebrate organism?

a. Diatom
b. Decapod
c. Gastropod
d. Ephemeroptera
e. Bivalvia

4. The water in jar “A” was collected from the surface of a mesotrophic system; the water in jar “B” was collected from the surface of a eutrophic system. What physical parameter should show the greatest difference between these two water samples?

a. Temperature
b. Dissolved oxygen concentration
c. Turbulence
d. Turbidity
e. Salinity

5. Identify the creature making this call by listening to the tape.

a. Wood frog
b. Pickerel frog
c. Spring peeper
d. Green frog

6. If a New York state stream contains a wild trout population then a permit is required to construct a road crossing it. Which of the following agencies would issue the needed permit?

a. United States Fish and Wildlife Service
b. Soil and Water Conservation District
c. New York State Department of Environmental Conservation
d. United States Environmental Protection Agency
e. New York State Department of Transportation

7. Because they produce so much plant biomass and invertebrate life, estuaries and their coastal marshes serve as important nursery areas for the young of many game (recreational) and commercial fish and shellfish. Which of the following fish species is dependent upon coastal wetlands?

a. Brown trout
b. Atlantic chad
c. Northern pike
d. Flounder

8. One of the main functions of a healthy watershed is the temporarily storage and transportation of water from the land surface to the water body. Over time, streams develop into defined drainage networks. Which of the following is not a recognized drainage pattern?

a. Parallel
b. Spiral
c. Angular
d. Dendritic