Posts Tagged ‘bats’

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.

 

Tiny Christmas Island pipistrelle bats near extinction

Thursday, December 15th, 2011

The independent newspaper have reported that the Christmas island pipistrelle bat is near extinction with only 20 bats remaining, under the bark of one tree on Christmas Island, off the coast of Australia. Experts have differing opinions on the best way to preserve the species.

Read the full article on the links below.

http://www.independent.co.uk/environment/nature/christmas-island-bat-months-from-extinction-1677667.html

Or some basic info on bats here

http://www.ues.org.uk/species/bats

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 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.

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.

Continued Professional Development training for Architects

Monday, February 14th, 2011

United Environmental Services were invited to conduct Continued Professional Development (CPD) training for a group of architects in Oxfordshire.

The training concentrated on the ecological factors which have a bearing on development and planning permission, and the best approach to take. As the audience were largely architects the main issue that they encountered was bats. The presentation concentrated on bats, the types of bat surveys available, the best deployment of those surveys, and the best approach to legislation, licensing and planning.

The training should help the architects to properly plan for and manage ecological issues which can affect the developments which they work on, which will help to keep project schedules on time and on budget.

Great crested newts were also covered on together with breeding birds, such as barn owls.

The training was very well received by the group

Beeston Castle bat boxes and caves checked for hibernating bats

Monday, February 14th, 2011

Beeston Castle in Cheshire is home to a maternity colony of  Natterers bats during the summer months. The site also has several other species of bats which use the castle buildings, trees and caves to roost.

A search of the cave during 2010 found 1 hibernating Natterers bat towards the rear of the cave. Bat boxes were fitted into a number of trees at the same time by Cheshire bat group.

A check of the caves in early 2007 found 5 bats hibernating, 1 towards the rear of the cave in the same place as it was discovered last year and 4 others closer to the cave entrance. The bat boxes which were fitted in the trees were also checked. Some droppings were found in a few of the boxes but no hibernating bats. As the boxes are not hibernation boxes this is not really surprising. Bird droppings and nesting materials were found in several of the boxes.

We will return during the summer to check the tree boxes and hopefully get more positive results.

Beavers could help to create bat habitat

Friday, January 21st, 2011

Beavers thinning out woodlands may help to create good quality feeding habitat for aerial hunting bats.

A study carried out by researchers from the University of Gdansk, Poland has shown that bats may be one of the species to benefit from the reintroduction of the European Beaver. The study showed that trees felled by beavers opened up the woodland and the number of aerial hunting bats increased. The bats also benefitted from the damming activities of the beaver which led to the flooding of areas of woodland, and an increase in the numbers of insect prey for the bats.

Bat surveys carried out by the research group indicated that the species which benefitted most were species such as common pipistrelle, soprano pipistrelle and nathusius pipistrelle and also the noctule bat.

Daubentons bats which are closely associated with water did not benefit as much as expected. This is possibly because daubentons bats like to hunt low over water using a reflected echolocation pulse to locate prey. The water in the flooded woodlands was quickly populated by aquatic plant species such as duckweed which scatters the echolocation pulse making hunting more difficult.

The reintroduction of the beaver could benefit many species such as the great crested newt.

The full article can be found by clicking the link below

http://news.bbc.co.uk/earth/hi/earth_news/newsid_9353000/9353551.stm