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levels in water decrease markedly, where water-levels are too low or if there is a risk of vandalism. If the risks are low, bottle trapping is maintained until the end of the survey period.
Population Estimate
If Great Crested Newts were detected then a further two surveys were carried out in order to gain a population estimate for the water body. This is calculated from the maximum number of newts caught or seen using one survey method. The maximum count breaks down into three size classes, presented in Table 1.
Table 1: Population Size Classes
Maximum Count recorded from any single survey method
1-9
10-99 100+
Population Size Class Small
Medium Large
East Anglia Offshore Wind Limited
Great Crested Newt Survey Technical Report 854188 (Rev 02)