• The periods of the year indicated in the following table are required to give the most reliable survey results. The application may not be valid if supporting surveys are undertaken at inappropriate times of year.
• Surveys which are conducted outside of the optimal survey period may be unreliable. Negative results obtained by conducting surveys outside of the optimal survey period should not be interpreted as the target species being absent, and further survey work during the optimal survey season may be required. An application or ecological report may not be considered valid until survey data from the optimal survey period is obtained and provided.
• Surveys should be carried out by suitably qualified and experienced ecologists. If undertaking surveys requires the disturbance, capture or handling of a protected species, the surveys should only be undertaken by a suitably licensed ecologist/professional.
• Surveys for species can also be weather dependent. It may be necessary to delay surveys or carry out multiple surveys if the weather is not suitable. Surveys carried out in unsuitable weather conditions may produce inaccurate results.
• Absence of evidence is not necessarily evidence of absence. If a species is not recorded as present, it does not necessarily mean that the species is absent from the site, or that the species’ habitats on site are not protected.
• Existing information held by Local Biological/Environmental Records Centres may be useful or required to inform surveys.
• Surveys should adhere to established and published national or local methodologies.
• Further information regarding surveys may be found at https://cieem.net/.
Guidance for ecological survey seasons by species/habitat