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Swedish Butterfly Monitoring Scheme, annual report for 2013

  • Lars Pettersson
  • Kajsa Mellbrand
  • Richard Ottvall
Publishing year: 2014
Language: Swedish
Document type: Report
Publisher: Department of Biology, Lund University

Abstract english

This is the fourth annual report of the Swedish Butterfly Monitoring Scheme, a national

monitoring programme coordinated by Lund University for the Swedish Environmental

Protection Agency since 2010. The programme is a partnership between the Entomological

Society of Sweden, the Swedish Environmental Protection Agency, Lund University, the

Swedish University of Agricultural Sciences and the Swedish County Administration Boards.

The monitoring scheme is volunteer-based and runs from April 1st to September 30th annually.

Sites are visited 3-7 times per season and are surveyed using a standardized, common

methodology. Two different recording methods are used in the Swedish Butterfly Monitoring

Scheme. One is the point site counts which cover an area with a 25 m radius for 15 min per

visit. The other method is fixed-route Pollard walk transects, typically 0.5-3 km in length.

These two methods enable the monitoring scheme to assess yearly changes both in the

number of butterflies seen and in species composition. The fourth year’s monitoring has

produced butterfly data from 162 fixed-route walks and 217 point sites, representing a 20%

increase in the number of transects and a 7% increase in the number of point sites. The sites

and walks are located across the whole country, from Beddingestrand in the South to

Vuollerim in the North. In 2013, 269 volunteer recorders participated in the Swedish Butterfly

Monitoring Scheme and have counted 65967 butterflies of 91 different species. On average,

12.7 species have been observed at the point sites while 18.4 have been observed along

transects. In this report, observations from 2013 of each species are shown as total counts,

distribution maps, and flight period histograms. The most numerous species in 2013 was the

Ringlet, followed by the Meadow Brown and the Green-veined White. Trends between 2010

and 2013 have been analysed for 90 butterfly and burnet moth species using the analytical

tool TRIM. Over the period, 27 species declined and 12 increased. Trends for the remaining

species were uncertain. Summarizing indices, so called indicators, have been calculated for 1)

the 20 most common species and 2) the 12 Swedish grassland butterflies that are part of the

European Butterfly Indicator for Grassland species. Both butterfly indicators show a decline

during 2012 and the grassland indicator suggests a recovery during 2013.


  • Ecology
  • Butterfly
  • Lepidoptera
  • Monitoring
  • Time series
  • biodiversity


  • ISBN: 978-91-7473-835-3
Lars B. Pettersson
E-mail: lars [dot] pettersson [at] biol [dot] lu [dot] se



+46 46 222 38 18

+46 70 611 63 45



Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden