Ecological Footprint in Earth

Ecological Footprint in Earth

LAB: The Impacts of Road Deicers on the Environment: Protozoans, part II: Data/Analysis

ONLINE VERSION: DATA ANALYSIS

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Introduction: Two weeks ago, you set up your experiments to determine if different commercial deicers have any effect on the protozoan community. For this week, it was intended for us to you look at samples through a microscope and identify any protozoans present; unfortunately, the weather did not cooperate, and only a few of us were able to check our experiments.

Recall the different treatments that were set up last week (in addition to the control):

De-Icer to add to your flask Claims of product/environment Melts ice at what temperature
None (control) n/a n/a
NaCl-based de-icer solution No claims 10-15 F
MgCl-based de-icer solution Plant-friendly -20 F
CaCl-based de-icer solution environmentally-friendly 0 F
HCOONa/urea-based de-icer solution (sodium formate/urea) Pet-friendly (doesn’t burn paws/non-toxic if paws licked) -2 F
sand Environmentally-friendly Does not melt ice, rather serves as an abrasive
Beet juice mixture Environmentally friendly 20 F

 

 

 

Directions for this activity: Review the Results section, the data collected by the students who were present, recorded in Tables 1-7 pages 2-3, and answer the questions in the Conclusions section on page 3.

 

 

 

PAGE 1

 

RESULTS (Tables 1-7)

Table 1.  Control—Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Para-mecium

 

Stentor/

vorticella

Vol-vox Scene-

desmus

Pond scum BG algae Liton-

otidae

rotifer closterium euglena stylonchia
abundance  

+++

++ + + + ++ + +++ ++ ++ ++

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

Table 2. NaCl— Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Nothing living
abundance Nothing living

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

Table 3. MgCl— Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Nothing living
abundance Nothing living

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

Table 4. CaCl— Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Green algae

 

Pond scum Blue green algae
abundance  

+

+ +

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

Table 5. HCOONa + urea — Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Blue-green algae Pond scum
abundance  

+

+

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

 

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Table 6. Sand — Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Para-mecium

 

Stentor/

vorticella

Vol-vox Scene-

desmus

Pond scum BG algae Liton-

otidae

rotifer closterium euglena stylonchia
abundance  

+++

++ + + + ++ + +++ ++ ++ ++

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

 

Table 7. Beet juice mixture — Protozoa and algae identified with approximate abundance for each

Protozoan/ algae Para-mecium

 

Stentor/

vorticella

Vol-vox Scene-

desmus

Pond scum BG algae Liton-

otidae

rotifer closterium euglena stylonchia
abundance  

+++

++ + + + ++ + +++ ++ ++ ++

+ = present, but only a few; ++ = present, in moderate numbers; +++ = present, numerous

 

CONCLUSIONS—Answer the following questions:

  1. Describe the overall results in paragraph form here:
  2. What conclusions can you draw from the class data in regards to the environmental effects of each de-icer on protozoan and algal communities?
  3. De-icing roadways is critical in keeping the public safe. Given the data, what do you feel a solution may be to keep both waterways and the public safe? Is there a compromise/middle ground in this situation?

 

 

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