1999 Missouri Envirothon 

Aquatic Station 

 

 

Aquatics 

 

A1. Using the Pond Area Extimator, determine the surfacae acreage of this pond. 

 

C. 3.1 Acres 





A2. Identify the (1) site of point source pollution that may effect this pond. 

 

 Drain tile entering upper end of pond 

 

A3. Name two effects of eliminating aquatic vegetation in this pond. 

 

 Reduced oxygen production 

 Reduced habitat 

 Reduced food supply 

 

A4. Of the following species, which are least desirable in a pond of this size? 

 

B. Bullhead Catfish, Crappie 





A5. Describe the phases of the Water Cycle, relating to this pond. 

 

 Transpiration (plants) 

 Evaporation 

 Condensation (fog) 

 Precipitation 

 

A6. Name two benefits of the rip-rap (rock) on the dam. 

 

 Habitat 

 Protects dam from muskrats 

 Protects dam from wind erosion 

 

A7. A healthy population of what fish species will keep all other species in balance? 

 

C. Largemouth Bass 





A8. Dissolved Oxygen levels are lowest in this pond at what time of Day? 

 

A. 3:00 a.m. to 6:00 a.m. 


 

 

 





A9. Crayfishes are common inhabitatns of ponds. How are they primarily identified in a food 
chain? 

 

D. As detritivores 





A10. Using the dichotomous key provided, determine this species of sish. 

 


Forestry 

 

F1. Name two ways that forests can protect water quality. 

 

 Stabilize soil 

 Filter soil and nutrients 

 Shade reduces water temperature 

 

F2. How can livestock overgrazing of this forested area effect the stream water quality below? 

 

 Add excess nutrients 

 Compact soil increasing runoff 

 

F3. If they burned off this forested area to increase farmable land, what effects would you not 
expect to see in the stream below? 

 

B. Increased fish production 





F4. As trees die and fall into the stream they provide habitats for invertebrates. Which 
invertebrates would suggest poor water quality? 

 

C. Left-handed snails, blackfly larvae and aquatic worms 





F5. High levels of turbidity in the water affect organisms in all of the following, except. 

 

D. Oxygen 






Soils 

 

S1. By volume or weight, soil is the _______ source of pollution affecting our streams and lakes. 

 

 #1 

 

S2. Define a watershed 

 

 The area of land that drains into a stream or body of water 

 

S3. What is a secci disk used to measure? 

 

 Turbidity 

 

S4. Excess soil in a stream causes all the following except. 

 

C. Salinity 





S5. Water from this watershed drains into: 

 

D. Gulf of Mexico 






Wildlife 

 

W1. How might the use of excessive herbicides on this prairie effect the stream that it drains into? 

 

 Killing plants will cause increased runoff 

 Herbicides that reach the stream will kill plants there also 

 

W2. The following species can be found in most prairies. Which does not have a development 
stage that requires a pond or stream,? 

 

A. Prairie Kingsnake 





W3. Benthic Invertebrates can be a very informative group to study because they are sensitive to 
___________ and __________ changes. 

 

B. Chemical and physical 





W4. What is an example of nonpoint source pollution? 

 

A. Farm runoff 





W5. Which is likely to cause more ground water pollution? 

 

B. A typical yard