Monitoring of butterflies within a landscape context
Swedish Environmental Protection Agency 2007 (English)Report (Other academic)
Monitoring of butterflies is most often only directed towards the grassland fauna.Species associated with other vegetation types, as well as the impact of the surroundinglandscape, often become neglected. The aim with this study was, in contrast, toperform a novel landscape-based monitoring method for butterflies in diversevegetation types and more specifically(i) evaluate the impact of environmental variables on butterfly abundance, (ii) comparethe distribution of butterflies in different vegetation types and (iii) analyse and improvethe monitoring method. Eight randomly placed study sites (750 m x 750 m) located insouth eastern Sweden were used. The vegetation composition inside the squares hadbeen assessed using aerial photos. Tree cover had largest impact on butterflyabundance with a negative linear relationship between abundance and increasing treecover. Clear-cuts were the vegetation type harbouring the overall highest abundanceand diversity of butterflies. In semi-natural grasslands, where the nationally-basedmonitoring of butterflies in Sweden currently is being performed, only 42% of thespecies were found, indicating a bias directed towards only a part of the species pool.The novel kind of monitoring presented here, using a landscape context, can, ifperformed regularly, increase our knowledge of how structural changes at landscapelevel affect butterflies and thereby improve the conservation efforts.Keywords: conservation, semi-natural grasslands, landscape perspective, Lepidoptera,rarefaction, vegetation type.
Place, publisher, year, edition, pages
Sveriges lantbruksuniversitet , 2007.
farming, biota, environment
Nils-squares, Variation, Butterflies, Abundance, Fjärilar
Research subject Miljöövervakningens programområden, Landscape; Environmental Objectives, A Rich Diversity of Plant and Animal Life
IdentifiersURN: urn:nbn:se:naturvardsverket:diva-233Local ID: 5ae60d32-1f9f-45cb-bc16-c5f76cfccefeISBN: SLU-SRG--AR—192--SEOAI: oai:DiVA.org:naturvardsverket-233DiVA: diva2:657798