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Science 18 December 1998: Vol. 282. no. 5397, pp. 2256 - 2258 DOI: 10.1126/science.282.5397.2256
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Reports
Prevention of Population Cycles by Parasite Removal
Peter J. Hudson,
*
Andy P. Dobson,
Dave Newborn
The regular cyclic fluctuations in vertebrate numbers have
intrigued scientists for more than 70 years, and yet the cause of such
cycles has not been clearly demonstrated. Red grouse populations in
Britain exhibit cyclic fluctuations in abundance, with periodic crashes. The hypothesis that these fluctuations are caused by the
impact of a nematode parasite on host fecundity was tested by
experimentally reducing parasite burdens in grouse. Treatment of the
grouse population prevented population crashes, demonstrating that
parasites were the cause of the cyclic fluctuations.
P. J. Hudson, Institute of Biological Sciences, University
of Stirling, Stirling FK9 4LA, UK. A. P. Dobson,
Department of Ecology and Evolutionary Biology, Eno Hall,
Princeton University, Princeton, NJ 08544-1003, USA. D. Newborn,
Game Conservancy Trust, Swaledale, North Yorkshire DL8 3HG, UK.
*
To whom correspondence should be addressed. E-mail:
p.j.hudson{at}stir.ac.uk
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