Swedish Butterfly Monitoring Scheme, annual report for 2013
Författare
Summary, in 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.
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.
Avdelning/ar
Publiceringsår
2014
Språk
Svenska
Fulltext
Länkar
Dokumenttyp
Rapport
Förlag
Department of Biology, Lund University
Ämne
- Ecology
Nyckelord
- Butterfly
- Lepidoptera
- Monitoring
- Time series
- biodiversity
Status
Published
Projekt
- Svensk Dagfjärilsövervakning
Forskningsgrupp
- Biodiversity and Conservation Science
ISBN/ISSN/Övrigt
- ISBN: 978-91-7473-835-3