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Science 24 February 2006:
Vol. 311. no. 5764, p. 1100
DOI: 10.1126/science.1121565
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Technical Comments

Response to Comments on "On the Regulation of Populations of Mammals, Birds, Fish, and Insects"

Richard M. Sibly,1* Daniel Barker,2 Michael C. Denham,3 Jim Hone,4 Mark Pagel1

The technical comments by Getz and Lloyd-Smith, Ross, and Doncaster focus on specific aspects of our analysis and estimation and do not demonstrate any results opposing our key conclusion—that, contrary to what was previously believed, the relation between a population's growth rate (pgr) and its density is generally concave.

1 School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6AJ, UK.
2 Sir Harold Mitchell Building, School of Biology, University of St. Andrews, St. Andrews, Fife, KY16 9TH, UK.
3 Statistical Sciences Europe, GlaxoSmithKline Research and Development Limited, New Frontiers Science Park, Third Avenue, Harlow, Essex CM19 5AW, UK.
4 Institute for Applied Ecology, University of Canberra, ACT 2601, Australia.

* To whom correspondence should be addressed. E-mail: r.m.sibly{at}reading.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)