Posts Tagged ‘bat survey’

The secret life of bats

Friday, December 16th, 2011

It's a snowy day here in the UES office

To cope with the lack of insects present during winter bats are able to hibernate. They can survive for months on the fat stores they have built up during the summer. During October bats seek suitable hibernation sites, and begin periods of torpor. Bats choose these sites (often called hibernacula) to provide the optimum environment for their hibernation.

Bats often hibernate in disused buildings, old trees or caves, where the temperate is generally below 10°C and remains constant. Hibernating is a state of inactivity characterised by a lower metabolic rate, slower breathing and a drop in body temperature almost to that of the surrounding environment. Once they have entered hibernation they are defenceless against danger, as it takes half an hour or more for a bat to revert back to its normal alertness after being woken. Bats continue to hibernate throughout winter until the weather warms in March / April, when they begin to come out of hibernation and are hungry and active.

Bats are protected by UK and European legislation therefore any action or development which has the potential to impact on bats or their habitats must be carried out under a European Protected Species (EPS) licence issued by Natural England. Bat surveys must be conducted to provide information on the type and number of bats which will be affected, how the bats use the site and what impact your development will have on any bats using the area.

 

Bat and ecological scoping survey in Swindon

Tuesday, November 8th, 2011

UES recently completed a bat and ecological scoping survey of a farm in Swindon. Our client has plans to demolish a number of buildings on site and convert other buildings for use as a hotel.

13 buildings were surveyed in total, of which 5 were identified as having high potential for use by bats. Low number of bat droppings believed to be long-eared species Plecotus were found in the internal roof spaces of the farmhouse. UES recommended further surveys on these buildings prior to the start on site to determine how many bats are present and how they are using the buildings.

All bats and their roosts are fully protected by law. Without detailed surveys you are at risk of destroying a bat roost or foraging grounds, which could have devastating consequences for the local bat population, and could land you with a fine or even a jail sentence and some very bad publicity.

During the survey UES recognised that the buildings and trees on site were all suitable for use by roosting and breeding birds, therefore any building works should be carried out outside of the breeding bird season (March to August inclusive) in order that breeding birds are not affected. If this is not possible then either a targeted breeding bird survey should be carried out or an ecological clerk of works appointed.

All breeding birds are protected under schedule 9 of the wildlife and countryside act 1981(as amended). Wild birds are protected from being killed, injured or captured. Their nests are protected from being damaged, destroyed or taken. Several species are included in schedule 1 of the act which gives them and their young protection while nesting.

The presence of protected species is a material consideration when a planning authority is considering a development proposal. The presence of protected species and the effect of the proposed development must be established before planning permission can be granted.

Bat scoping survey in Lancashire

Thursday, November 3rd, 2011

UES recently completed a bat scoping survey of a house and associated outbuildings in Lancashire. Our client has plans to demolish a number of buildings onsite and is applying for planning permission for a new build housing scheme.

The aim of the survey was to assess the site for the presence of bat roosts and bat activity within the structure of the buildings. The buildings were searched both externally and internally for bat presence and features associated with bat activity, as detailed in Bat Conservation Trust guidance (2007).

No field signs of bats such as droppings, feeding remains, rubbing or urine stains were found during the building inspections, and as such UES deemed that no further survey work was required in relation to bats.

However, house sparrows were observed breeding inside the building, and therefore mitigation and compensation measures were suggested in relation to breeding birds as ‘The Wildlife and Countryside Act (WCA) 1981’ states that all wild birds are protected. Under the WCA, it is an offence to kill, injure or take any wild bird, to take damage or destroy the nest of any wild bird, or to take or destroy the egg of any wild bird.

Bats and badgers in Buckinghamshire

Wednesday, November 2nd, 2011

UES conducted a full bat survey of a barn in Marlow, Buckinghamshire in September 2011. Our client plans to change the use of the barn from agricultural to a dwelling.

Low numbers of common species of bats were observed using the area to forage and commute. The species recorded were Common pipistrelle Pipistrellus pipistrellus and Soprano pipistrelle Pipistrellus pygmaeus.

During the course of the survey some evidence of badgers was found including feeding remains and a latrine. A single badger was also observed in a hole on the northwest corner of the barn.

UES are currently completing badger monitoring surveys of the site in Buckinghamshire using remote wildlife cameras. Remote cameras are ideal for badger monitoring surveys allowing you to set it up onsite and return later to collect your images. Remote cameras can be set to take pictures or videos regularly with the time lapse facility, or when it is triggered by an animal moving into the field of view. Either way, it gives a remarkable insight into the wildlife in the vicinity.

Bat research workshop in Crete

Wednesday, November 2nd, 2011

During September Toby attended a week long bat research workshop in a small coastal village called Sougia in Crete. In 2008, 17 bat species of bats had been recorded on Crete, some of which only occur in the eastern Mediterranean. The European free-tailed bat (Tadarida teniotis) is the most widely recorded species, but also found on this island are Blasius’s horseshoe bat (Rhinolophus blasii), Long-fingered bat (Myotis capaccinii), Kuhl’s pipistrelle (Pipistrellus kuhli), Savi’s pipistrelle (Pipistrellus savi), Hanaki ‘s dwarf bat (Pipistrellus hanaki), plus Kolombatovic’s long-eared bat (Plecotus kolombatovici) and Mountain long-eared bat (Plecotus macrobullaris).

Toby was involved in carrying out an inventory of bats in the southwest of Crete by a combination of bat detector surveys, trapping at underground site entrances and at ponds, over streams and in gorges, including the 17km long Samaria Gorge, which is one of the longest gorges in Europe.

Species Toby recorded in Crete;

  • European free-tailed bat
  • Lesser horseshoe (Rhinolophus hipposideros)
  • Greater horseshoe (Rhinolophus ferrumequinum)
  • Blasius’s horseshoe bat
  • Kuhl’s pipistrelle
  • Savi’s pipistrelle
  • Hanaki ‘s dwarf bat
  • Long-fingered bat
  • Lesser mouse-eared bat (Myotis blythii)
  • Whiskered bat (Myotis mystacinus)
  • Lesser mouse-eared subspecies
  • Shreiber’s bat (Miniopterus schreibersii)
  • Mountain long-eared bat
  • Kolombatovic’s long-eared bat

Bat survey in Cranage, Cheshire

Monday, August 15th, 2011

Fitting a bat box

UES have completed a bat presence/absence survey at a site in Cheshire. Our client intended to demolish a building and so a bat survey was required in order to inform the planning process.

The building was searched internally and externally for signs of use by bats, and emergence and return roost surveys were carried out. The surveys found bats roosting in the boxed soffits of the building and also under the roof and ridge tiles.

UES recommended that a licensed bat ecologist be present during the demolition in case any bats were found within the building.  During demolition a male pipistrelle was found roosting under the roof tiles and so was carefully rehomed to a new bat box that UES had positioned on site.

Extended phase 1 survey in Connahs Quay, Deeside

Monday, August 15th, 2011

UES have completed an extended phase 1 habitat survey of a site in Deeside, North Wales in order to inform the client of any potential impacts their development would have on habitats and species.

Semi-improved neutral grassland

The site was defined as semi-improved neutral grassland. The species composition and pattern of growth reflect an unmanaged and ungrazed grassland dominated by course-leaved tussock grasses notably False oat-grass, Cocks foot and Yorkshire fog.

As part of the extended phase 1 habitat survey, specific observations of wildlife were also recorded. Wildlife observations focus on protected species, invasive species or species of conservation interest. Numerous species of birds were recorded during the survey which could have been breeding on or local to site.

In terms of the surrounding area the development of the site in Connahs Quay presents only a minor loss of habitat quality. UES suggested that landscaping should aim to promote species diversity by the appropriate design of habitats and habitats mosaics which promotes natural linkages and hence dispersal of target species. Suggested ideas that may be beneficial to wildlife include, planting of berry and nut bearing shrub species when landscaping, use of nectar bearing flowers, creating a wildflower garden, creating bird feeding stations and the hanging bat and bird boxes on site.

Extended phase 1 habitat survey for Seddon Homes in Lancashire

Thursday, August 4th, 2011

UES have completed an extended phase 1 habitat survey of a site in Lancashire in order to inform the client of any potential impacts their development would have on habitats and species.

A phase 1 habitat survey is a standard method of environmental audit. It involves categorising different habitat types and habitat features within a survey area. The information gained from the survey can be used to determine the ecological value of the site, and to direct any more specific survey work which may need to be carried out prior to the start of work, such as badger surveys, barn owl surveys, bat surveys, great crested newt surveys, dormouse surveys, water vole surveys, breeding bird surveys, hedgerow surveys and tree surveys.

Male Palmate newt (Lissotriton helveticus)

Seddon Homes applied for planning permission for a new build housing scheme which was subject to a ‘Code for Sustainable Homes’ (CSH) assessment. The aim of the Code for Sustainable Homes is to encourage development on land that has a limited value to wildlife, and discourage the use of previously undeveloped land.

The site was surveyed and all species on site recorded. The development site was deemed to be of moderate ecological value due to the neutral grassland with associated mature trees and species-rich countryside hedgerows. Numerous species of birds were also recorded during the survey which could have been breeding on or local to site. Further surveys for great crested newts (GCN) were conducted due to a pond on site being identified as suitable for amphibians. Palmate newts were found on site.

It was decided that enhancement measures were required in order to secure an ecological benefit at site level and achieve the maximum number of CSH ecological credits. The client welcomed the suggestion of incorporating bat and bird boxes into the design of the new buildings, which could provide a real benefit to local bat and bird populations.

On the hunt for orchids

Tuesday, July 19th, 2011

There are 56 species of wild orchid in Britain and Ireland (out of around 25,000 known species worldwide). In the UK wild orchids can be found in a variety of natural habitats including woodland, grassland, marshes, heaths and sand dunes, as well as in managed sites such as abandoned pits and roadside verges. Each orchid species has its own blooming season, which can run from as early as April in the case of the Early-purple orchid to as late as September for the Autumn ladies tresses.

The main threats to wild orchids in the UK are habitat change and destruction. In Britain, orchids are protected by the Wildlife And Countryside Act, 1981, which states that it is an offence to uproot them unless you have permission from the land owner.

UES spotted these wild orchids whilst completing ecological surveys in Cheshire, Liverpool, and Hampshire.

UES volunteer for the Bat Conservation Trust (BCT)

Friday, July 15th, 2011

BCT runs a number of national, annual surveys to monitor the status of bats throughout the UK. These surveys form the National Bat Monitoring Programme (NBMP). UES volunteers with around 3000 others to collect essential data on bat populations every year.

UES is currently completing field surveys of 3 sites in Cheshire. Each survey involves walking a triangular route in a randomly allocated 1km square on two evenings in July, to record noctule, serotine, common pipistrelle and soprano pipistrelle bat activity. UES uses several pieces of equipment during a bat survey; bat boxes which can detect the echolocation calls of bats, and the Anabat system which detects bat echolocation calls and displays them visually on a PDA screen which makes recording of the bat calls and identification of the bat species much more accurate.

The NBMP is of great importance as UK bat populations have declined considerably during the past century due to building and development works affecting roosts, and the loss of feeding habitats and flightlines.