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Research Article

Protected areas facilitate species’ range expansions

Chris D. Thomas, Phillipa K. Gillingham, Richard B. Bradbury, David B. Roy, Barbara J. Anderson, John M. Baxter, Nigel A. D. Bourn, Humphrey Q. P. Crick, Richard A. Findon, Richard Fox, Jenny A. Hodgson, Alison R. Holt, Mike D. Morecroft, Nina J. O’Hanlon, Tom H. Oliver, James W. Pearce-Higgins, Deborah A. Procter, Jeremy A. Thomas, Kevin J. Walker, Clive A. Walmsley, Robert J. Wilson, and Jane K. Hill
  1. aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
  2. bConservation Science Department, Royal Society for the Protection of Birds, Beds SG19 2DL, United Kingdom;
  3. cNatural Environment Research Council Centre for Ecology and Hydrology, Oxfordshire OX10 8BB, United Kingdom;
  4. dPolicy and Advice Directorate, Scottish Natural Heritage, Edinburgh EH12 7AT, United Kingdom;
  5. eButterfly Conservation, Dorset BH20 5QP, United Kingdom;
  6. fNatural England, Cambridge CB2 8DR, United Kingdom;
  7. gDepartment of Environment, Food, and Rural Affairs, London SW1P 3JR, United Kingdom;
  8. hDepartment of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, United Kingdom;
  9. iNatural England, Cromwell House, Winchester SO23 7BT, United Kingdom;
  10. jBritish Trust for Ornithology, Norfolk IP24 2PU, United Kingdom;
  11. kJoint Nature Conservation Committee, Peterborough PE1 1JY, United Kingdom;
  12. lDepartment of Zoology, University of Oxford, Oxford OX1 3PS, United Kingdom;
  13. mBotanical Society of the British Isles, North Yorkshire HG1 5DG, United Kingdom;
  14. nCountryside Council for Wales, Bangor LL57 2DW, United Kingdom; and
  15. oCentre for Ecology and Conservation, University of Exeter, Penryn TR10 9EZ, United Kingdom

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PNAS August 28, 2012 109 (35) 14063-14068; https://doi.org/10.1073/pnas.1210251109
Chris D. Thomas
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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  • For correspondence: chris.thomas@york.ac.uk
Phillipa K. Gillingham
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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Richard B. Bradbury
bConservation Science Department, Royal Society for the Protection of Birds, Beds SG19 2DL, United Kingdom;
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David B. Roy
cNatural Environment Research Council Centre for Ecology and Hydrology, Oxfordshire OX10 8BB, United Kingdom;
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Barbara J. Anderson
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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John M. Baxter
dPolicy and Advice Directorate, Scottish Natural Heritage, Edinburgh EH12 7AT, United Kingdom;
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Nigel A. D. Bourn
eButterfly Conservation, Dorset BH20 5QP, United Kingdom;
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Humphrey Q. P. Crick
fNatural England, Cambridge CB2 8DR, United Kingdom;
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Richard A. Findon
gDepartment of Environment, Food, and Rural Affairs, London SW1P 3JR, United Kingdom;
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Richard Fox
eButterfly Conservation, Dorset BH20 5QP, United Kingdom;
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Jenny A. Hodgson
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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Alison R. Holt
hDepartment of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, United Kingdom;
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Mike D. Morecroft
iNatural England, Cromwell House, Winchester SO23 7BT, United Kingdom;
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Nina J. O’Hanlon
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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Tom H. Oliver
cNatural Environment Research Council Centre for Ecology and Hydrology, Oxfordshire OX10 8BB, United Kingdom;
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James W. Pearce-Higgins
jBritish Trust for Ornithology, Norfolk IP24 2PU, United Kingdom;
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Deborah A. Procter
kJoint Nature Conservation Committee, Peterborough PE1 1JY, United Kingdom;
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Jeremy A. Thomas
lDepartment of Zoology, University of Oxford, Oxford OX1 3PS, United Kingdom;
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Kevin J. Walker
mBotanical Society of the British Isles, North Yorkshire HG1 5DG, United Kingdom;
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Clive A. Walmsley
nCountryside Council for Wales, Bangor LL57 2DW, United Kingdom; and
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Robert J. Wilson
oCentre for Ecology and Conservation, University of Exeter, Penryn TR10 9EZ, United Kingdom
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Jane K. Hill
aDepartment of Biology, University of York, York YO10 5DD, United Kingdom;
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  1. Edited by Paul R. Ehrlich, Stanford University, Stanford, CA, and approved July 25, 2012 (received for review June 15, 2012)

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Abstract

The benefits of protected areas (PAs) for biodiversity have been questioned in the context of climate change because PAs are static, whereas the distributions of species are dynamic. Current PAs may, however, continue to be important if they provide suitable locations for species to colonize at their leading-edge range boundaries, thereby enabling spread into new regions. Here, we present an empirical assessment of the role of PAs as targets for colonization during recent range expansions. Records from intensive surveys revealed that seven bird and butterfly species have colonized PAs 4.2 (median) times more frequently than expected from the availability of PAs in the landscapes colonized. Records of an additional 256 invertebrate species with less-intensive surveys supported these findings and showed that 98% of species are disproportionately associated with PAs in newly colonized parts of their ranges. Although colonizing species favor PAs in general, species vary greatly in their reliance on PAs, reflecting differences in the dependence of individual species on particular habitats and other conditions that are available only in PAs. These findings highlight the importance of current PAs for facilitating range expansions and show that a small subset of the landscape receives a high proportion of colonizations by range-expanding species.

  • conservation
  • climate change adaptation
  • nature reserves

Footnotes

  • ↵1To whom correspondence should be addressed. E-mail: chris.thomas{at}york.ac.uk.
  • ↵2Present address: School of Applied Sciences, Christchurch House, Bournemouth University, Poole BH12 5BB, United Kingdom.

  • Author contributions: C.D.T., P.K.G., R.B.B., D.B.R., B.J.A., J.M.B., H.Q.P.C., R.A.F., R.F., J.A.H., A.R.H., M.D.M., N.J.O., T.H.O., J.W.P.-H., D.A.P., K.J.W., C.A.W., and J.K.H. designed research; P.K.G., D.B.R., B.J.A., and T.H.O. performed research; and C.D.T., P.K.G., R.B.B., D.B.R., B.J.A., J.M.B., N.A.D.B., H.Q.P.C., R.A.F., R.F., J.A.H., A.R.H., M.D.M., N.J.O., T.H.O., J.W.P.-H., D.A.P., J.A.T., K.J.W., C.A.W., R.J.W., and J.K.H. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission.

  • Data deposition: All data are derived from existing databases, which are listed in the text.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1210251109/-/DCSupplemental.

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Protected areas facilitate range expansions
Chris D. Thomas, Phillipa K. Gillingham, Richard B. Bradbury, David B. Roy, Barbara J. Anderson, John M. Baxter, Nigel A. D. Bourn, Humphrey Q. P. Crick, Richard A. Findon, Richard Fox, Jenny A. Hodgson, Alison R. Holt, Mike D. Morecroft, Nina J. O’Hanlon, Tom H. Oliver, James W. Pearce-Higgins, Deborah A. Procter, Jeremy A. Thomas, Kevin J. Walker, Clive A. Walmsley, Robert J. Wilson, Jane K. Hill
Proceedings of the National Academy of Sciences Aug 2012, 109 (35) 14063-14068; DOI: 10.1073/pnas.1210251109

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Protected areas facilitate range expansions
Chris D. Thomas, Phillipa K. Gillingham, Richard B. Bradbury, David B. Roy, Barbara J. Anderson, John M. Baxter, Nigel A. D. Bourn, Humphrey Q. P. Crick, Richard A. Findon, Richard Fox, Jenny A. Hodgson, Alison R. Holt, Mike D. Morecroft, Nina J. O’Hanlon, Tom H. Oliver, James W. Pearce-Higgins, Deborah A. Procter, Jeremy A. Thomas, Kevin J. Walker, Clive A. Walmsley, Robert J. Wilson, Jane K. Hill
Proceedings of the National Academy of Sciences Aug 2012, 109 (35) 14063-14068; DOI: 10.1073/pnas.1210251109
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