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USING ADI TO QUANTIFY A COLOR CHANGE IN CRAYFISH. Jennifer Welborn. Do Crayfish Change Color If Their Environment Changes? A Guided Inquiry Lab for 7 th grade Life Science.
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USING ADI TO QUANTIFY A COLOR CHANGE IN CRAYFISH Jennifer Welborn
Do Crayfish Change Color If Their Environment Changes? A Guided Inquiry Lab for 7th grade Life Science • Background: There is anecdotal evidence from bass fisherman that crayfish are able to change color depending on their surroundings. A (cursory ) literature review of this phenomenon showed that no formal research has been done in this area. Students had an additional informal lesson about research funding (or lack thereof) because of this finding. • Students designed and conducted a controlled experiment to see the effect of changing environment color on crayfish color. • ADI was used to quantify a color change.
Frameworks Alignment • Science Inquiry Skills are part of the Massachusetts frameworks for Science and Technology as well as the New Generation Science Standards Grades 6–8 • Formulate a testable hypothesis. • Design and conduct an experiment specifying variables to be changed, controlled, and measured. • Select appropriate tools and technology (e.g., calculators, computers, thermometers, meter sticks, balances, graduated cylinders, and microscopes), and make quantitative observations. • Present and explain data and findings using multiple representations, including tables, graphs, mathematical and physical models, and demonstrations. • Draw conclusions based on data or evidence presented in tables or graphs, and make inferences based on patterns or trends in the data. • Communicate procedures and results using appropriate science and technology terminology. • Offer explanations of procedures, and critique and revise them.
First week of Life Science– Science as a Way of Knowing: Inquiry Unit-- student pairs make qualitative and quantitative observations of their crayfish
Second Week– Students design and conduct a controlled experiment with crayfish and use ADI to quantify a color change
Make sure to photograph labels so that photos can be Identified later
Draw a rectangle which lies just inside the SHARPIE Rectangle on the crayfish Record the R, G, B values on a table. These are the values of the color of the crayfish after it is has been on dark rocks for 3 days and has just been transferred to light rocks.
Graph of R, G, B values of the image of the crayfish after it had been on dark rocks for 3 days.
Choose red vs blue normalized, But play around with the other Options first!
Graph of red vs blue normalized after the crayfish was on dark rocks.
Record the new R, G, B values in the data table. These are the values of the color of the crayfish after it has been on light rocks for 3 days.
Red vs blue normalized image after Crayfish has been on lighter rocks.. Hmmm……….
Graph of red vs blue normalized after Crayfish has been on lighter colored rocks