Citizen science reveals trends in bat populations: The National Bat Monitoring Programme in Great Britain

Citizen science reveals trends in bat populations: The National Bat Monitoring Programme in Great Britain

•We model population trends of bats in Great Britain from volunteer survey data.•Trained citizen scientists can be successfully used to monitor bats.•Ten species or groups show stable or increasing trends from at least one survey. Bats play an important role in ecosystems and are highly relevant as...

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Bibliographic Details
Published in:Biological conservation Vol. 182; pp. 14 - 26
Main Authors: Barlow, K.E., Briggs, P.A., Haysom, K.A., Hutson, A.M., Lechiara, N.L., Racey, P.A., Walsh, A.L., Langton, S.D.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-02-2015
Subjects:
Bats
Biodiversity
Chiroptera
Conservation
Environmental monitoring
Eptesicus serotinus
Great Britain
Indicators
Monitoring
Myotis nattereri
Pictures
Pipistrellus pipistrellus
Pipistrellus pygmaeus
Population trends
Populations
Rhinolophus ferrumequinum
Survey methods
Trends
ANE, Europe
Survey methods
Bats
Conservation
Biodiversity
Indicators
Population trends
Chiroptera
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Summary:•We model population trends of bats in Great Britain from volunteer survey data.•Trained citizen scientists can be successfully used to monitor bats.•Ten species or groups show stable or increasing trends from at least one survey. Bats play an important role in ecosystems and are highly relevant as indicators of environmental change. Long-term monitoring of bat populations is therefore fundamental to verifying environmental change over time. Although in the past, significant declines in bat populations have been reported across Europe, only limited data are available from systematic monitoring schemes over long periods. In this study we use data from the National Bat Monitoring Programme, a citizen science scheme drawing on over 3500 volunteers, to estimate changes in populations across Great Britain for 10 bat species or species groups between 1997 and 2012. We demonstrate uniquely how data collected on relative abundance and activity of bats by volunteers at 3272 sites using standardised, multiple survey methods (counts at roosts and bat detector surveys using tuneable, heterodyne detectors) can be successfully utilised to produce statistically robust population indices for a large proportion of a country’s bat fauna. All trends calculated, with the exception of one species (Rhinolophus ferrumequinum), had sufficient power to detect Red Alert level declines. Our results reveal a generally favourable picture for bats over the monitoring period; all species showed a stable or increasing trend from at least one survey type, although for four species where there were multiple trends from different survey types, the trend directions did not agree (Myotis nattereri, Pipistrellus pipistrellus, Pipistrellus pygmaeus and Eptesicus serotinus). This study demonstrates that use of volunteer programmes can be successful in monitoring bat populations, provided that key features including standardised survey methods and volunteer training are incorporated. Some species that are more difficult to detect and identify may however require specialist surveillance techniques.
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ISSN:0006-3207
1873-2917
DOI:10.1016/j.biocon.2014.11.022