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Proc. Natl. Acad. Sci. USA Vol. 96, pp. 1073510740, September 1999
 

Summary: Proc. Natl. Acad. Sci. USA
Vol. 96, pp. 10735­10740, September 1999
Ecology
Host-driven population dynamics in an herbivorous insect
TIINA YLIOJA*, HEIKKI ROININEN, MATTHEW P. AYRES§, MATTI ROUSI*, AND PETER W. PRICE¶
*Punkaharju Research Station, Finnish Forest Research Institute, FIN-58450 Punkaharju, Finland; Department of Biology, University of Joensuu, P.O. Box 111,
FIN-80101 Joensuu, Finland; §Department of Biological Sciences, Dartmouth College, Hanover, NH 03755; and ¶Department of Biological Sciences, Northern
Arizona University, P.O. Box 5640, Flagstaff, AZ 86011
Communicated by May R. Berenbaum, University of Illinois at Urbana-Champaign, Urbana, IL, July 8, 1999 (received for review
September 9, 1998)
ABSTRACT Understanding the nature and relative im-
portance of endogenous (density-dependent) and exogenous
(density-independent) effects on population dynamics re-
mains a central problem in ecology. Evaluation of these forces
has been constrained by the lack of long time series of
population densities and largely limited to populations chosen
for their unique dynamics (e.g., outbreak insects). Especially
in herbivore populations, the relative contributions of bot-
tom-up and top-down effects (resources and natural enemies,
respectively) have been difficult to compare because popula-

  

Source: Ayres, Matthew.P. - Department of Biological Sciences, Dartmouth College

 

Collections: Environmental Sciences and Ecology