Long-distance dispersal and habitat use of the butterfly Byasa impediens in a fragmented subtropical forest
Article first published online: 29 MAR 2012
© 2012 The Authors. Insect Conservation and Diversity © 2012 The Royal Entomological Society
Insect Conservation and Diversity
Volume 6, Issue 2, pages 170–178, March 2013
How to Cite
LI, X.-S., ZHANG, Y.-L., SETTELE, J., FRANZÉN, M. and SCHWEIGER, O. (2013), Long-distance dispersal and habitat use of the butterfly Byasa impediens in a fragmented subtropical forest. Insect Conservation and Diversity, 6: 170–178. doi: 10.1111/j.1752-4598.2012.00199.x
- Issue published online: 15 MAR 2013
- Article first published online: 29 MAR 2012
- Accepted 12 February 2012 First published online 29 March 2012 Editor: Raphael Didham Associate editor: Phil DeVries
- habitat loss;
- long-distance dispersal;
Abstract. 1. Central and Southeast Asia currently faces rapid loss and degradation of tropical and subtropical forests with potentially severe effects on its biodiversity.
2. We analysed population characteristics and dispersal of the butterfly Byasa impediens in eleven patches of a fragmented subtropical forest in Western China.
3. In an area covering 30 km2, we found an unexpected high dispersal capacity of more than 5 km, and estimated a mean dispersal distance of 1 km according to the negative exponential function. However, the inverse power function gave a better fit and predicted a reasonably large fraction of long-distance displacements: 4% of all movements were estimated to exceed 5 km.
4. In spite of the high level of fragmentation and small sizes of some patches, we did not observe extinction or (re)colonisation events. Matching dispersal ability with the spatial grain of the resource patches in the landscape is seen as a major cause. In addition, persistence, emigration and immigration of individuals were exclusively affected by the amount of larval host plants, nectar plants and forest cover.
5. Our study indicates the importance of long-distance dispersal and shows that species with large dispersal abilities and a somewhat broader dietary niche, such as B. impediens, can sustain in fragmented areas if patch quality is sufficient.
6. We suggest that conservation action may not only focus on particularly endangered species but also on relatively common, but often endemic, insect species. This is of particular concern given the global dominance of insects and their importance for ecosystem services, especially in an area of constantly increasing demands of agricultural products.