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Artrikedomen av fladdermöss minskar med ökad belysning av gamla kyrkor i Vänersborgs kommun
Halmstad University, School of Business, Engineering and Science.
2020 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Artificial light is a contributing factor to habitat fragmentation and habitat loss for nocturnal animals such as bats. While fast flying species of bats sometimes can benefit from street lights, slower flying species are the ones most affected by lights due to their increased vulnerability to predation. Old churches are suitable roosting places for bats but are increasingly lit up for aesthetic reasons. This may lead to bat species loss and reduced diversity. In order to test whether species richness of occurring bat species correlates to the number of up lit sides of churches, 9 different sites in Vänersborgs municipality were observed. The area around churches and graveyards at each site were searched for bats using automatically recording autoboxes, manual heterodyne and time expansion bat detectors. For all sites combined, 10 species were found in total which means there is a high abundance of bat species in Vänersborg’s municipality. My results show that bat species richness is reduced with the number of lit sides of church buildings. Each up lit side reduces bat species richness on an average with 2 species. Especially slower flying species of bats are negatively affected by artificial light. I conclude that lighting is threatening the general survival of bats and I recommend that (1) artificial lights for only esthetic reasons on old buildings were bats occur should be removed. (2) if lights are necessary, that lighting should be restricted to one of the least sensitive areas, depending on occurring species. This way resident bats species will have dark corridors to move through between their roots and feeding grounds.

Place, publisher, year, edition, pages
2020. , p. 26
Keywords [en]
bats, chiroptera, artificial light, light pollution, barbastell, pipistrellus pipistrellus, myotis daubentonii, myotis, pipistrellus
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-41741OAI: oai:DiVA.org:hh-41741DiVA, id: diva2:1411557
Subject / course
Biology
Educational program
Conservation and Diversity, 180 credits
Presentation
2020-01-16, Halmstad, 22:03 (Swedish)
Supervisors
Examiners
Available from: 2020-03-05 Created: 2020-03-03 Last updated: 2020-03-05Bibliographically approved

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File name FULLTEXT02.pdfFile size 6204 kBChecksum SHA-512
694759c86e73a9fc074c893c27fedfeb40071f0b0174dc6dde24d75992e57e91d4727bf11fa816e0598c52b044e6dbb0e5c5a7dc91486f531e6f958aae150126
Type fulltextMimetype application/pdf

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf