Emergence / re-entry, activity surveys or phase 2 bat surveys, are follow-up surveys which are conducted after dark, either at dusk or dawn, and aim to identify the number of bats, species and roosting locations within the building, structure or tree. Bat Surveys: Emergence and Activity Surveys What is an Emergence or Activity Survey? Let’s start with why there is an emergence survey season. If the initial assessment does detect the presence of bats, this will trigger the need for what’s known as a bat emergence survey. The stage 2 bat survey, which Arbtech refers to as the emergence survey, is undertaken if the scoping survey finds bats presents or finds evidence of bats, such as droppings. Following on from initial inspections of buildings and trees, it is sometimes necessary to undertake further activity or emergence surveys to either assess whether a roost is present, or to gain further information about species, numbers and use of a site. Depending on the scale of the project, this could involve anything from one to three ecologists visiting the site at dawn and dusk on three occasions, armed with bat detectors. emergence surveys for potential indiana bat roosts In some limited cases (e.g., individual hazard tree removal during the active season), surveyors may have the option of conducting emergence surveys for individual potential Indiana bat roosts It may also be required if a building provides medium to high potential for roosting, even if there is no evidence of bats. If an Indiana bat(s) is captured during mist-netting, protocols for Phase 4- Radio-tracking and Emergence Surveys provided in Appendix D and E, respectively, must be followed. Bats are mammals that predate on insects, which in the vast majority are not prevalent in the winter months. Survey Type J F M A M J J A S O N D Manual bat detector surveys: commuting/foraging Manual bat detector surveys: dusk/dawn emergence/re-entry* Inspection of … So, where does this leave y… A bat survey can be required where there is a conversion, modification or removal of buildings (including hospitals, churches etc) which are: ... appear suitable for bats then the next stage will be ‘activity surveys ‘ also called ’emergence and re-entry’. During the warmer, drier months, bats emerge in the evening, generally just before dusk, to use their highly specialised echolocation calls to literally catch insects on the wing. Bat surveys such as scoping can be undertaken at any time of the year however emergence / activity surveys are restricted to the bat activity season, between March to September with the optimum season between May and September inclusive. Have a look below to find out which of our surveys are right for you and how to take part. Radio-tracking and emergence surveys can provide vital data regarding roosting habitat and colony size. The National Bat Monitoring Programme surveys are carefully designed so that anybody can take part in monitoring these fascinating but easily overlooked mammals. The UK is home to 17 species of bat, all of them protected by statutes such as the Wildlife and Countryside Act and the Conservation of Habitats and Species Regulations. These timings are for general guidance and not for specific site assessment. Bat Survey Timetable N.B.
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