Core practical 11: random sampling with quadrats

Edexcel International A Level Biology (YBI11), chapter 15: Ecology, specification point 5.14. Part of the full course.

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Random quadrat sampling estimates the abundance of organisms without counting every individual in a large area. Random coordinates make the sample fair, while pilot studies help you choose the quadrat size and number.

More lessons in Ecology

Population, community, habitat and ecosystem
Succession: from colonisation to climax
Abiotic factors and population size
Biotic factors: predation, competition and disease
How the niche explains distribution and abundance
Core practical 11: transects and abiotic measurements
Null hypotheses and choosing a statistical test
Spearman's rank correlation coefficient
Student's t-test
The chi-squared test