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Further survey effort may be required when evidence of bats or potential for bats to use a structure is found during the Stage 1 – Preliminary Ecological Appraisal.

Further survey effort will normally involve several visits by ecologists to provide detailed information on what type of roost is present as well as at what time of year the roost is in use.

There are many types of survey and it is very important that the aims and objectives of the are clearly defined before starting to ensure they are met once the surveys are completed. Below are some examples of the main types of survey methods for bats:

Activity Survey – normally conducted by a pair of ecologists who walk a prescribed route and record bat activity using hand-held bat detectors to establish which bat species are using a site and which features they are using.

Presence/absence Survey – can be conducted using automated survey equipment but more normally carried out by ecologist waiting outside a building carrying out dusk emergence and pre-dawn  re-entry survey using hand-held detectors.

Roost Characterisation Survey – this survey is normally required when work is likely to impact on a known bat roost and is designed to provide more detailed information such as how the roost is used, how often it is used and by how many bats and what features of the structure containing the roost and the surrounding area are of importance.  This type of survey may also include a recording of the internal climatic conditions of the roost and how the surrounding features are being utilised by bats.

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