Svenska Dagfjärilsövervakning Årsrapport 2015

Research output: Book/ReportReport

Abstract

This is the sixth 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 sixth year’s monitoring has produced butterfly data from 222 fixed-route walks and 277 point sites, representing a 28 % increase in the number of transects and a 6 % 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 2015, 294 volunteer recorders participated in the Swedish Butterfly Monitoring Scheme and have counted 75 343 butterflies of 94 different species. On average, 11.7 species have been observed at the point sites while 16.2 have been observed along transects. In this report, observations from 2015 of each species are shown as total counts, distribution maps, and flight period histograms. The most numerous species in 2015 was the Ringlet, followed by the Meadow Brown and the Essex skipper. Trends between 2010 and 2015 have been analysed for 86 butte rfly and burnet moth species using the analytical tool TRIM. Over the period, 30 species declined, 14 increased, and 5 species were stable. Trends for the remaining species were uncertain. Summarizing indices, so called indicators, have been calculated for 1) the 20 most common species, 2) the 12 Swedish grassland butterflies that are part of the European Butterfly Indicator for Grassland species, 3) widespread butterflies associated with farmland, and 4) forest butterflies. All four butterfly indicators indicate that 2011 was the best butterfly year so far. The Grassland Butterfly Indicator shows a marked decline in 2012 followed by a recovery and then a new decline in 2015. The Common Species Indicator, the Farmland Species Indicator and the Forest Species Indicator all remain relatively stable over the period, although the Farmland Species Indicator is considerably lower now than in 2010-2011.

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Subject classification (UKÄ) – MANDATORY

  • Ecology
  • Zoology
Translated title of the contributionSwedish Butterfly Monitoring Scheme,
Original languageSwedish
Place of PublicationLund
PublisherBiologiska institutionen, Lunds universitet
Commissioning bodySwedish Environmental Protection Agency
Number of pages98
ISBN (Print)978-91-7623-652-9
Publication statusPublished - 2017 Dec 20
Publication categoryResearch

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Lars B. Pettersson

Swedish Environmental Protection Agency

2010/04/01 → …

Project: Network

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