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How frequent is metapopulation structure among butterflies in grasslands? Occurrence patterns in a forest-dominated landscape in southern Sweden

Ranius, Thomas; Nilsson, Sven LU and Franzen, Markus (2011) In Écoscience 18(2). p.138-144
Abstract
We determined the proportion of butterfly species that occur as metapopulations with grasslands as the only habitat. We counted all butterflies in 19 semi-natural grassland patches in a forest-dominated landscape in southern Sweden over a 5-y period. Seven of the 44 butterfly species observed exhibited a metapopulation structure. The other species either use grassland mainly for adult feeding but not for breeding (8 species), breed both in grassland and in surrounding habitat types (19 species), or are grassland specialists but their colonization-extinction dynamics are probably not significant, since they were present in nearly all (> 80%) patches (10 species). Occupancy was generally higher in larger patches, and tended to increase... (More)
We determined the proportion of butterfly species that occur as metapopulations with grasslands as the only habitat. We counted all butterflies in 19 semi-natural grassland patches in a forest-dominated landscape in southern Sweden over a 5-y period. Seven of the 44 butterfly species observed exhibited a metapopulation structure. The other species either use grassland mainly for adult feeding but not for breeding (8 species), breed both in grassland and in surrounding habitat types (19 species), or are grassland specialists but their colonization-extinction dynamics are probably not significant, since they were present in nearly all (> 80%) patches (10 species). Occupancy was generally higher in larger patches, and tended to increase with patch connectivity. Among grassland specialists and habitat generalists, the connectivity measure tended to explain more of the variation in occupancy if the shortest dispersal paths avoiding routes over water were considered rather than a measure based on the Euclidian distance between patches. This indicates that lakes, even when they are just a few hundred metres wide, can act as barriers to dispersal for butterflies. We conclude that for many butterflies that occur in semi-natural grasslands in forest-dominated landscapes, intervening habitats are important as breeding sites or as dispersal barriers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
connectivity, dispersal barrier, lakes, matrix, occurrence
in
Écoscience
volume
18
issue
2
pages
138 - 144
publisher
Université Laval
external identifiers
  • wos:000292512200007
  • scopus:79959995045
ISSN
1195-6860
DOI
10.2980/18-2-3396
project
BECC
language
English
LU publication?
yes
id
ad512a60-d5ea-44ad-938a-fbfd2b88cc3d (old id 2094262)
date added to LUP
2011-08-24 09:54:24
date last changed
2017-01-01 05:25:03
@article{ad512a60-d5ea-44ad-938a-fbfd2b88cc3d,
  abstract     = {We determined the proportion of butterfly species that occur as metapopulations with grasslands as the only habitat. We counted all butterflies in 19 semi-natural grassland patches in a forest-dominated landscape in southern Sweden over a 5-y period. Seven of the 44 butterfly species observed exhibited a metapopulation structure. The other species either use grassland mainly for adult feeding but not for breeding (8 species), breed both in grassland and in surrounding habitat types (19 species), or are grassland specialists but their colonization-extinction dynamics are probably not significant, since they were present in nearly all (> 80%) patches (10 species). Occupancy was generally higher in larger patches, and tended to increase with patch connectivity. Among grassland specialists and habitat generalists, the connectivity measure tended to explain more of the variation in occupancy if the shortest dispersal paths avoiding routes over water were considered rather than a measure based on the Euclidian distance between patches. This indicates that lakes, even when they are just a few hundred metres wide, can act as barriers to dispersal for butterflies. We conclude that for many butterflies that occur in semi-natural grasslands in forest-dominated landscapes, intervening habitats are important as breeding sites or as dispersal barriers.},
  author       = {Ranius, Thomas and Nilsson, Sven and Franzen, Markus},
  issn         = {1195-6860},
  keyword      = {connectivity,dispersal barrier,lakes,matrix,occurrence},
  language     = {eng},
  number       = {2},
  pages        = {138--144},
  publisher    = {Université Laval},
  series       = {Écoscience},
  title        = {How frequent is metapopulation structure among butterflies in grasslands? Occurrence patterns in a forest-dominated landscape in southern Sweden},
  url          = {http://dx.doi.org/10.2980/18-2-3396},
  volume       = {18},
  year         = {2011},
}