Macroinvertebrate in freshwater lab

Individual Activity: Fresh water for people and nature assignment

Name:

Objectives:

  1. Describe the treats to freshwater ecosystems
  2. Learn how scientists determine the health of freshwater ecosystems
  3. Practice quantifying the health of freshwater ecosystems
  4. Practice identifying freshwater invertebrates

Part 1. Reading Question

According to the text in Chapter 16 of Conservation Science, what are the four major threats to the quantity and quality of fresh water? Of these four concerns, which do you think poses the highest risk?

 

Part 2. Macroinvertebrate River Quality Assessment

Go to https://www.biologysimulations.com/macroinvertebrates

  1. For River I, collect macroinvertebrates five times by clicking “Click here to collect macroinvertebrates.”
  2. For each collection, use the Group Identification Key to identify the group for each organism and count the number of organisms in each group. Record the results in Table 1.

Table 1

Collection # of Group I Organisms # of Group II Organisms # of Group III Organisms
1      
2      
3      
4      
5

 

     
Total Group Number      

 

  1. Find the total number of organisms collected.

 

Group I Total + Group II Total + Group III Total = ______________

 

  1. Find the % for each group. Record the results in Table 2.

Table 2

Group Group %
I  
II  
III  

 

  1. Use Table 3 to assign points to each group based on the Group %.

Table 3

  Point Assignment Based on %  
Group 2 points 1 point 0 points Points for group
I > 35% 15% to 35% < 15%  
II < 35% 35 to 50% > 50%  
III < 50% 50 to 65% > 65%  

 

  1. Use Table 4 to determine the Index Score.

Table 4

Point Assignment # of groups Multiply # of groups by Index Score
2   x 2  
1   x 1  
0   x 0  
Total Index Score  

 

  1. Use Table 5 and the total index score to determine the river quality.

Table 5

Index Score River Quality
5 – 6 Good
3 – 4 Fair
0-2 Poor

 

 

River I River Quality: ___________

 

 

 

 

 

 

  1. Repeat the process for River II.

Table 1a

Collection # of Group I Organisms # of Group II Organisms # of Group III Organisms
1      
2      
3      
4      
5      
Total Group Number      

 

Table 2a

Group Group %
I  
II  
III  

 

 

 

 

 

 

Table 3a

  Point Assignment Based on %  
Group 2 points 1 point 0 points Points for group
I > 35% 15% to 35% < 15%  
II < 35% 35 to 50% > 50%  
III < 50% 50 to 65% > 65%  

 

Table 4a

Point Assignment # of groups Multiply # of groups by Index Score
2   x 2  
1   x 1  
0   x 0  
Total Index Score  

 

 

River I River Quality: ___________

 

  1. Compare the two rivers. What types of factors could contribute to differences?

 

 

  1. What management strategies do you propose for these sites in the future?

 

 

 

Group Identification Key

 

 

 

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