FA10 Farmland butterflies

The monitoring of butterflies in Finnish agricultural landscapes is mainly based on transect counts made by volunteers. In the summer of 2015 altogether 49 transect line were studied in an area covering Finland from the southern coast to Norther Ostrobothnia. A total of 101 different transects have been counted over the monitoring period.

Transect counts are carried out by slowly walking along a predetermined route and making notes of all butterflies observed inside a imaginary 5 x 5 x 5 metres cube. The same route is walked year after year. The values on population abundance are produced using the TRIM sofware which is used internationally for similar purposes.


Population development of farmland butterflies (2001=1.00)

 
All species
(45 species)
1999
0,8
2000
1,3
2001
1,0
2002
1,4
2003
1,0
2004
0,8
2005
0,9
2006
1,2
2007
1,0
2008
0,8
2009
0,9
2010
1,3
2011
1,6
2012
1,2
2013
1,1
2014
0,6
2015
0,7
2016
0,8

 Species population trends 1999–2016

Development
Species
Strong decline
5
Moderate decline
14
Stable
10
Moderate increase
7
Strong increase
2
Unclear
7
Lajeja yhteensä
45
   Download data on a spreadsheet from here

 

Links:

Butterfly monitoring in Finnish agricultural landscapes

References:

Pitkänen, M., Kuussaari, M. & Pöyry, J.2001. Butterflies. P. 51-68 in M.Pitkänen & J.Tiainen (eds.): Biodiversity in agricultural landscapes in Finland. BirdLife Finland Conservation Series no.3.