Bat work manual 26 (3791)



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to their presence.The Natterer’s bat roosts were all in listed buildings, close to woodland, with hollow mortice joints, open or absent doors and unimpeded flying space inside. It was found that
Natterer’s bat colonies were often mobile, regularly moving between joints and making use of all that were available. Signs that joints were being used included staining and lack of cobwebs around the joint gaps. Droppings maybe visible but, even in larger roosts, the number easily seen maybe relatively small.
Owners were often unaware that their barns were used by bats.
This maybe, in part, due to the late emergence of these species and the fact that they were only present insignificant numbers during the summer breeding period.
Suitable barns are increasingly being converted for residential use and, consequently, their suitability as bat roosts is often lost. It maybe possible to reduce this loss by retaining features that are required by bats, such as hollow mortice joints and room within the roofspace for bats to fly in.
Source: Extract from Bat News, No. 44, January 1997 (see Briggs, During a survey of 92 barns in Hertfordshire and Middlesex,
carried out over an month period, various criteria emerged that typified barns most likely to be used by bats.These included an age of over 100 years, a floor space of at least 300 sq m, and the presence of thick beams and a roof.The roof could be of any type including corrugated iron. Barns in a poor state of repair were found to be used but those housing grain drying machinery were not, presumably because they were too dirty.
The features found to be most attractive to bats were the crevices in the mortice joints of beams. Most of the barns examined during the survey were constructed with post-and-truss frames, a type typically built in the south and southeast of England between the 12th and 19th centuries. Nails were uncommon before the 19th century, so looking for wooden pegs and wedges can give an indication of the age of a barn.
Forty of the surveyed barns contained evidence of use by bats.
The species most often present were Natterer’s bats (15 barns)
and brown long-eared bats (13 barns).The brown long-eared bats tend to roost along the central ridge beam and, therefore, often leave a line of droppings underneath, which can be a useful clue


Health and safety in bat work
Catching bats
Ringing and marking
Public relations
Conserving and creating bat roosts
Forewordbat
Bat workers manual 09acknowledgements
Bats and the law
Law enforcement – gathering evidence
Convention on the conservation of
Public inquiry confirms importance of lesser horseshoe bat roost
Taking bats into captivity
Advice to the public who find grounded bats
Advice on bats and rabies
Dust and insulation
Wasp, bee and hornet nests
Survey and monitoring
Day surveys of potential roost structures
Case study – bats in barns survey
Case study – the bats in churches project
Identification
Bats and echolocation
Bat detectors
Basic equipment required:
Sonogram analysis
Extraction from hand-nets
Figure 4.1hand-nets. polythene around the lip prevents bats climbing out.figure 4.3
Single-pole flicking
Chapter 4 c atching bats44two-pole flicking
Chapter 4 c atching bats463
Testicular descent
Chapter 5 examining bats50figure 5.1
Parturition and lactation
Fur colour and texture
Wing span, and head and body length
Mites, including ticks (acari)
Bat-bugs (hemiptera, cimicidae)
Fleas (siphonaptera, ischnopsyllidae)
Bat-flies (diptera, nycteribiidae)
Rabies surveillance
Chapter 5 examining bats56sending dead bats by post
References and further reading
Handling, releasing and keeping bats
Moral considerations
Adultstemporary debility or injury likely to heal
Permanent captives
Bat conservation trust - guidelines on bats in captivity
Insects and substitutes
Vitamins and minerals
Weaning and rearing orphaned bats
The role of a bat group
The bat conservation trust
Bats on the internet
Bats in the living area
General fear of bats
Damage to buildings
Transmission of disease
Interior design fora huge roost of (smelly) bats
Legal position (simplified)
Outside the breeding season
Insects in droppings
Speciesnumber of roosts
Summary – exclusion of bats
Summary – visit to householders who have discovered bats
Security alarm systems in buildings
Timber treatment, pest control
During breeding season
If bats are torpid
Fungicidescommon name
If bats are active
Outside breeding season
Fusible link shutters
Case study - window and lintel replacement
Case study - roof refurbishment
Case study – timber treatment and roof renovation
Excessive disturbance
Destruction, maintenance or change of use
Chapter 11 conserving and creating bat roosts112figure 11.1
Grade b sites without protection.
Grade 4 (many sites)
Grade 1 (fewer than 10 sites)
Railway tunnel enhancement
Cave construction
Manipulation of airflow and temperature
Reopening of blocked sites
Provision of additional roosting points
Chapter 11 conserving and creating bat roosts122figure 11.5
Figure 11.5 (continued)
Converting a pillbox for bats
Bat conservation code
Wildlife and countryside act 1981 &
Tree preservation orders
Maintaining roosts
Creating roosts
Case histories of bridge maintenance works
Examples of roost creation within bridges
Appendix 1140figure a1.1
Appendix 1142figure a1.1
Appendix 3 9
Grid reference.
Biological records centre single species card
Monitoring methods
Hibernation counts
Bat speciessc
Appendix 4150participation and experience required
A selected bibliography
A european bats – identification,
C children’s books
Appendix 5154d journals, magazines and newsletters
Bat research news
Useful names and addresses
The environment and heritage service
Department for environment, food and rural
Non governmental organisations
National association of mining history
The national trust
Subterranea britannica
Equipment suppliers
Pettersson elektronik ab
Bernies cafe and caving supplies
Watkins and doncaster
Holohil systems ltd
Titley electronics
Jacobi jayne & co
Mealwormslive foods direct ltd
Bat workers training syllabus
Circumstances requiring consultation
Licensinglicensable activities
Appendix 7164other licences
Bat biology and ecology
Basic ecology
Bat conservation
Persecution and intolerance
Presenting bats to the public
Safety underground
Appendix 7168training checklist
Model risk assessment for entry into disused mines (cont)
Model risk assessment for initial entry into derelict and dilapidated buildings and structures
Model risk assessment for initial entry into derelict and dilapidated buildings and structures (cont)
Model risk assessment for entry into confined spaces
Model risk assessment for entry into confined spaces (cont)
Health and safety at work etc act 1974
Health and safety legislation
The carriage of dangerous goods
References legislation
Appendix 9178for laboratory use only



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