Embedded Files
Complete pages 15 and 16 in the student virtual fieldwork booklet for this section.
Learning Intention
Learning Intention
To use the working scientifically process to investigate the relationship between tidal movement and crab distribution and use the data sets to analyse and form a conclusion.
Inquiry Question:
Inquiry Question:
How are crabs distributed across the intertidal zone?
Working Scientifically
Working Scientifically
Processing Data
Analysing Data
Questioning and Predicting
Questioning and Predicting
Mangrove BoardwalkYoutube (1:36min)
Observation
Observation
I have seen whilst walking along the mangrove boardwalk (see video) that the number of crab holes decrease as I move from the low tide end to the high tide end of the intertidal zone.
Hypotheis
Hypotheis
As you move from the creek (low tide) to the forest (high tide) in a mangrove forest the number of adult crab holes decreases.
Planning Investigations
Planning Investigations
Aim
Aim
To investigate how the abundance and distribution of crabs change across the mangrove zone from low tide to high tide.
Materials
Materials
5 x quadrats (1 metre x 1 metre)
ruler
Method
Method
Collect your materials
Randomly place a 1m x 1m quadrat at the low tide end of the boardwalk at 0m.
Count the number of crab holes that are visible inside the quadrat and record.
Repeat this by randomly placing quadrats at 10m intervals along the boardwalk towards the high tide end.
Mangrove Boardwalk Virtual Tour
Mangrove Boardwalk Virtual Tour
Take the Mangrove Boardwalk Virtual Tour to help you understand the method.
Scientific Variables
Scientific Variables
Independent variable
Independent variable
(the variable that needs to be changed)
Distance from low tide mark
Dependent variable
Dependent variable
(the variable to be measured)
Number of holes in 1m x 1m quadrat
Controlled variables
Controlled variables
(the variables to be kept consistent)
Size of holes to be counted
Random placement of quadrat
Ethical and Safety Considerations
Ethical and Safety Considerations
Ethical
Ethical
Damaging the environment
Safety
Safety
Leaning over boardwalk and falling when taking measurement
Processing Data and Information
Processing Data and Information
Crab Hole Data Set 1
Crab Hole Data Set 1
Date: Thursday 19th March 2020
Time: 10.30am-11.00am.
Low Tide: 12.43pm 0.54m
Recent Weather: Warm
View images below, count the crab holes to complete the table in your fieldwork booklet. Click on the image to make it bigger.
Quadrat A - 0 metres
Quadrat B - 10 metres
Quadrat C - 20 metres
Quadrat D - 30 metres
Quadrat E - 40 metres
Crab Hole Data Set 2
Crab Hole Data Set 2
Date: Thursday 2nd April 2020
Time: 10.30am-11.00am.
Low Tide: 10.32am 0.62m
Recent Weather: Warm
View images below, count the crab holes to complete the table in your fieldwork booklet. Click on the image to make it bigger.
Quadrat A - 0 metres
Quadrat B - 10 metres
Quadrat C - 20 metres
Quadrat D - 30 metres
Quadrat E - 40 metres
Analysing Data and Conclusion
Analysing Data and Conclusion
Complete the following activities in your fieldwork booklet
Analysing Data and Information Graph or organise your data to see trends or patterns. Summarise what you have found.
Reliability, Validity and Accuracy: Was your method fair (reliable, valid and accurate)? How could you improve your method?
Conclusion: Do your results confirm your hypothesis?
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