Resin Duct Defenses in Ponderosa Pine during a Mountain Pine Beetle Outbreak: Genetic Effects, Mortality, and Relationships with Growth
نویسندگان
چکیده
...................................................................................................................... iii ACKNOWLEDGMENTS ................................................................................................. iv TABLE OF CONTENTS .................................................................................................... v INTRODUCTION .............................................................................................................. 6 MATERIALS & METHODS ........................................................................................... 12 Study site and plant material ......................................................................................... 12 Mortality survey ............................................................................................................ 13 Resin duct defenses, growth, and mortality .................................................................. 14 Genetic influence of resin duct traits ............................................................................ 17 Drought effects on resin duct production ...................................................................... 17 Trade-offs between growth and defense ....................................................................... 17 RESULTS ......................................................................................................................... 19 Role of defenses during the outbreak ............................................................................ 19 Genetic influence of resin duct traits ............................................................................ 20 Effect of drought on resin duct defenses....................................................................... 20 Resin duct defenses, growth, and mortality .................................................................. 21 DISCUSSION ................................................................................................................... 22 Resin duct defenses: phenotypic and genotypic effects on mortality ........................... 23 Genetic influence of resin duct traits ............................................................................ 25 Drought effects on resin duct defenses ......................................................................... 26 Trade-offs between growth and defense ....................................................................... 28 Conclusion .................................................................................................................... 30 REFERENCES ................................................................................................................. 43
منابع مشابه
Separating Trends in Whitebark Pine Radial Growth Related to Climate and Mountain Pine Beetle Outbreaks in the Northern Rocky Mountains, USA
Drought and mountain pine beetle (Dendroctonus ponderosae Hopkins) outbreaks have affected millions of hectares of high-elevation conifer forests in the Northern Rocky Mountains during the past century. Little research has examined the distinction between mountain pine beetle outbreaks and climatic influence on radial growth in endangered whitebark pine (Pinus albicaulis Engelm.) ecosystems. We...
متن کاملHost Defense Mechanisms against Bark Beetle Attack Differ between Ponderosa and Lodgepole Pines
Conifer defenses against bark beetle attack include, but are not limited to, quantitative and qualitative defenses produced prior to attack. Our objective was to assess host defenses of lodgepole pine and ponderosa pine from ecotone stands. These stands provide a transition of host species for mountain pine beetle (Dendroctonus ponderosae; MPB). We asked two questions: (1) do the preformed quan...
متن کاملImpact of mountain pine beetle outbreaks on forest albedo and radiative forcing, as derived from Moderate Resolution Imaging Spectroradiometer, Rocky Mountains, USA
[1] Mountain pine beetle (Dendroctonus ponderosae) outbreaks in North America are widespread and have potentially large-scale impacts on albedo and associated radiative forcing. Mountain pine beetle outbreaks in Colorado and southern Wyoming have resulted in persistent and significant increases in both winter albedo (change peaked 10 years post outbreak at 0.06 ± 0.01 and 0.05 ± 0.01, in lodgep...
متن کاملClimate influences on whitebark pine mortality from mountain pine beetle in the Greater Yellowstone Ecosystem.
Extensive mortality of whitebark pine, beginning in the early to mid-2000s, occurred in the Greater Yellowstone Ecosystem (GYE) of the western USA, primarily from mountain pine beetle but also from other threats such as white pine blister rust. The climatic drivers of this recent mortality and the potential for future whitebark pine mortality from mountain pine beetle are not well understood, y...
متن کاملMountain Pine Beetle Dynamics and Reproductive Success in Post-Fire Lodgepole and Ponderosa Pine Forests in Northeastern Utah
Fire injury can increase tree susceptibility to some bark beetles (Curculionidae, Scolytinae), but whether wildfires can trigger outbreaks of species such as mountain pine beetle (Dendroctonus ponderosae Hopkins) is not well understood. We monitored 1173 lodgepole (Pinus contorta var. latifolia Doug.) and 599 ponderosa (Pinus ponderosa Doug. ex Law) pines for three years post-wildfire in the Ui...
متن کامل