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Asymmetric dispersal and survival indicate population sources for grassland butterflies in agricultural landscapes

Öckinger, Erik LU and Smith, Henrik LU (2007) In Ecography 30(2). p.288-298
Abstract
We tested the hypothesis that populations in small habitat fragments remaining in agricultural landscapes are maintained by repeated immigration, using three grassland butterflies (Aphantopus hyperantus, Coenonympha pamphilus and Maniola jurtina). Transect counts in 12 matched sets of semi-natural pastures, and linear habitat elements proximate and isolated from the pastures showed that population densities of M. jurtina and C. pamphilus were significantly higher in pastures and in linear habitats adjacent to these than in isolated linear elements. A mark-recapture study in a 2x2 km landscape indicated that individuals of all three species are able to reach even the isolated linear elements situated at least 1 km from the grasslands. For... (More)
We tested the hypothesis that populations in small habitat fragments remaining in agricultural landscapes are maintained by repeated immigration, using three grassland butterflies (Aphantopus hyperantus, Coenonympha pamphilus and Maniola jurtina). Transect counts in 12 matched sets of semi-natural pastures, and linear habitat elements proximate and isolated from the pastures showed that population densities of M. jurtina and C. pamphilus were significantly higher in pastures and in linear habitats adjacent to these than in isolated linear elements. A mark-recapture study in a 2x2 km landscape indicated that individuals of all three species are able to reach even the isolated linear elements situated at least 1 km from the grasslands. For two of the species, A. hyperantus and C. pamphilus, analysis of the mark-recapture data revealed higher daily local survival rates in the semi-natural pastures and more individuals dispersing from pastures to linear habitat elements. The proportion of old compared to young individuals of C. pamphilus and M. jurtina were significantly higher in linear elements than in semi-natural pastures, which suggests that butterflies emerging in pastures subsequently dispersed to the linear elements. In combination, these results suggest that semi-natural pastures act as population sources, from which adult butterflies disperse to surrounding linear elements. Hence, preservation of the remaining fragments of semi-natural grassland is necessary to keep the present butterfly abundance in the surrounding agricultural landscape. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecography
volume
30
issue
2
pages
288 - 298
publisher
Wiley-Blackwell
external identifiers
  • wos:000245604000012
  • scopus:34247188664
ISSN
1600-0587
DOI
10.1111/j.2007.0906-7590.05048.x
language
English
LU publication?
yes
id
8a96ffc4-719e-4038-9c96-46f2347b77f3 (old id 168624)
date added to LUP
2007-06-26 13:12:39
date last changed
2017-07-23 04:31:12
@article{8a96ffc4-719e-4038-9c96-46f2347b77f3,
  abstract     = {We tested the hypothesis that populations in small habitat fragments remaining in agricultural landscapes are maintained by repeated immigration, using three grassland butterflies (Aphantopus hyperantus, Coenonympha pamphilus and Maniola jurtina). Transect counts in 12 matched sets of semi-natural pastures, and linear habitat elements proximate and isolated from the pastures showed that population densities of M. jurtina and C. pamphilus were significantly higher in pastures and in linear habitats adjacent to these than in isolated linear elements. A mark-recapture study in a 2x2 km landscape indicated that individuals of all three species are able to reach even the isolated linear elements situated at least 1 km from the grasslands. For two of the species, A. hyperantus and C. pamphilus, analysis of the mark-recapture data revealed higher daily local survival rates in the semi-natural pastures and more individuals dispersing from pastures to linear habitat elements. The proportion of old compared to young individuals of C. pamphilus and M. jurtina were significantly higher in linear elements than in semi-natural pastures, which suggests that butterflies emerging in pastures subsequently dispersed to the linear elements. In combination, these results suggest that semi-natural pastures act as population sources, from which adult butterflies disperse to surrounding linear elements. Hence, preservation of the remaining fragments of semi-natural grassland is necessary to keep the present butterfly abundance in the surrounding agricultural landscape.},
  author       = {Öckinger, Erik and Smith, Henrik},
  issn         = {1600-0587},
  language     = {eng},
  number       = {2},
  pages        = {288--298},
  publisher    = {Wiley-Blackwell},
  series       = {Ecography},
  title        = {Asymmetric dispersal and survival indicate population sources for grassland butterflies in agricultural landscapes},
  url          = {http://dx.doi.org/10.1111/j.2007.0906-7590.05048.x},
  volume       = {30},
  year         = {2007},
}