The Swedish Butterfly Monitoring Scheme

Welcome! The Swedish Butterfly Monitoring Scheme is a new national monitoring programme coordinated by Lund University for the Swedish Environmental Protection Agency. The programme was initiated in 2010, and 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.

During the first year, 2010, 117 volunteer recorders joined the Swedish Butterfly Monitoring Scheme. They counted nearly 30 000 butterflies of 83 different species. Maps and full information about the observations (including English and scientific names of all species) can be found in the annual report. The data came from 59 fixed-route walks and 108 point sites. The sites and walks are located across the whole country, from Malmö in the South to Luleå in the North.  On average, 12.3 species have been observed at the point sites while 20.3 have been observed along transects. 

The number of volunteers have increased by 75% up to 205 in 2011. There are now 86 fixed-route walks and 168 point sites and the number of recorded butterflies have increased to 53 000 individuals of 90 species.

The most common species in 2010 and 2011 have been:
1. Ringlet, Aphantopus hyperantus (2010-11)
2. Meadow Brown, Maniola jurtina (2010-11)
3a. Brimstone, Gonepteryx rhamni (2010)
3b. Small Tortoiseshell, Aglais urticae (2011)

As yearly observation data accumulate, butterfly population trends will be analysed, both nationally within the Swedish Butterfly Monitoring Scheme and internationally within the partner network Butterfly Conservation Europe.

You are most welcome to contact us for more information and/or to provide suggestions!


You can get the 2010 Annual Report of the Swedish Butterfly Monitoring Scheme (partly in English) here:

2010 Annual Report  (PDF, 18.5 MB)

2010 Annual Report  LOWRES (PDF, 6.1 MB)

Contact information

You can reach us via email, mail and telephone (see below):

The Swedish BMS

c/o Lars Pettersson
Biodiversity unit
Dept of Biology
Ecology Building
SE-223 62 Lund

+46 (0)46 222 3818

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