How to estimate percentage cover of one or more species using a quadrat
N = (n1 × n2) ÷ m2
Scientists wanted to investigate the abundance of leafhoppers in a small grassy meadow. They used sweep nets to catch a large sample of leafhoppers from the meadow. Each insect was marked on its underside with non-toxic waterproof paint and then released back into the meadow. The following day another large sample was caught using sweep nets. Use the figures below to estimate the size of the leafhopper population in this meadow.
Step One: Write out the equation and substitute in the known values
N = (n1 × n2) ÷ m2
N = (236 × 244) ÷ 71
Step Two: Calculate the population size estimate (N)
N = 57,584 ÷ 71
N = 811
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