Thomas, C.D., Bodsworth, E.J., Wilson, R.J., Simmons, A.D., Davies, Z.G., Musche, M. and Conradt, L. (2001) Ecological and evolutionary processes at expanding range margins. Nature, 411 (4837). pp. 577-581. ISSN 0028-0836
Many animals are regarded as relatively sedentary and specialized in marginal parts of their geographical distributions. They are expected to be slow at colonizing new habitats. Despite this, the cool margins of many species' distributions have expanded rapidly in association with recent climate warming. We examined four insect species that have expanded their geographical ranges in Britain over the past 20 years. Here we report that two butterfly species have increased the variety of habitat types that they can colonize, and that two bush cricket species show increased fractions of longer-winged (dispersive) individuals in recently founded populations. Both ecological and evolutionary processes are probably responsible for these changes. Increased habitat breadth and dispersal tendencies have resulted in about 3- to 15-fold increases in expansion rates, allowing these insects to cross habitat disjunctions that would have represented major or complete barriers to dispersal before the expansions started. The emergence of dispersive phenotypes will increase the speed at which species invade new environments, and probably underlies the responses of many species to both past and future climate change.
|Copyright, Publisher and Additional Information:||© 2001 Macmillan Magazines Ltd|
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > University of Leeds Research Centres and Institutes > Centre for Biodiversity and Conservation (Leeds)|
|Depositing User:||Repository Officer|
|Date Deposited:||22 Sep 2004|
|Last Modified:||04 Jun 2014 17:37|