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COMMUNITY ECOLOGY Richard W. Hofstetter James T. Cronin

Richard W. Hofstetter James T. Cronin
Kier D. Klepzig John C. Moser Matthew P. Ayres
Antagonisms, mutualisms and commensalisms affect outbreak dynamics
of the southern pine beetle
Received: 6 May 2005 / Accepted: 4 November 2005 / Published online: 2 December 2005
Springer-Verlag 2005
Abstract Feedback from community interactions
involving mutualisms are a rarely explored mechanism
for generating complex population dynamics. We
examined the effects of two linked mutualisms on the
population dynamics of a beetle that exhibits outbreak
dynamics. One mutualism involves an obligate associa-
tion between the bark beetle, Dendroctonus frontalis and
two mycangial fungi. The second mutualism involves
Tarsonemus mites that are phoretic on D. frontalis
(``commensal''), and a blue-staining fungus, Ophiostoma
minus. The presence of O. minus reduces beetle larval
survival (``antagonistic'') by outcompeting beetle-mutu-
alistic fungi within trees yet supports mite populations


Source: Ayres, Matthew.P. - Department of Biological Sciences, Dartmouth College
Cronin, James T. - Department of Biological Sciences, Louisiana State University
Hofstetter, Richard W. - School of Forestry, Northern Arizona University


Collections: Biology and Medicine; Engineering; Environmental Sciences and Ecology