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

Author:
  • Erik Öckinger
  • Henrik Smith
Publishing year: 2007
Language: English
Pages: 288-298
Publication/Series: Ecography
Volume: 30
Issue: 2
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

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.

Keywords

  • Ecology

Other

Published
  • ISSN: 1600-0587
Henrik Smith
E-mail: henrik.smith [at] biol.lu.se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

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Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
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