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Effects of fire and mechanical wounding on Pinus resinosa resin defenses, beetle attacks, and pathogens

Summary: Effects of fire and mechanical wounding on Pinus resinosa
resin defenses, beetle attacks, and pathogens
MariŽa J. Lombardero a,*, Matthew P. Ayres b
, Bruce D. Ayres c
Departamento de ProduccioŽn Vegetal, Universidad de Santiago, E.P.S. Campus de Lugo, Lugo 27002, Spain
Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA
Great Lakes Institute for Pine Ecosystem Research, 310 W Third Ave, Colfax, WI 54730, USA
Received 19 April 2005; received in revised form 15 November 2005; accepted 2 January 2006
Pinus resinosa is an ecologically and economically important native pine of the northern Great Lakes region, USA. The survival of adult trees
can be challenged by fire, physical wounding, fungal pathogens, and bark beetles, which frequently occur in combination. We conducted
experiments to test for interactions among these disturbance agents. Specifically, we measured responses of the oleoresin defense system to
simulated ground fires and mechanical wounding, together and alone. Then we measured the attraction of study trees to ambient populations of Ips
bark beetles, and their suitability as hosts for four species of necrotizing fungal pathogens commonly associated with Ips spp. P. resinosa responded
to scorching and mechanical wounding with an initial decrease in resin defenses, which returned to pre-treatment levels in 7­10 days and continued
to increase until resin flow was about twice that of control trees after 55 days. Fungal inoculation also produced an approximate doubling of resin
flow after 55 days. Combinations of treatments did not increase resin flow more than single treatments. There were consistent differences among


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


Collections: Environmental Sciences and Ecology