Publications

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local and latitudinal variation in abundance: the mechanisms shaping the distribution of an ecosystem engineer.ecological processes that determine the abundance of species within ecological communities vary across space and time. these scale-dependent processes are especially important when they affect key members of a community, such as ecosystem engineers that create shelter and food resources for other species. yet, few studies have examined the suite of processes that shape the abundance of ecosystem engineers. here, we evaluated the relative influence of temporal variation, local processes, and lati ...201323862102
ducking as a means of resistance to herbivory in tall goldenrod, solidago altissima.many populations of goldenrod show a peculiar, genetically controlled stem dimorphism. in solidago altissima, for instance, while most stems are erect, a sizable minority (the "candy-cane" stems) nod at the apex during growth. we used data from three studies to test the hypothesis that this candy-cane growth form confers resistance to herbivory. in a controlled growth trial, we showed that nodding is a temporary phenomenon that coincides with the oviposition period of at least two common apex-at ...200819137934
host-plant genotypic diversity mediates the distribution of an ecosystem engineer.ecosystem engineers affect ecological communities by physically modifying the environment. understanding the factors determining the distribution of engineers offers a powerful predictive tool for community ecology. in this study, we examine whether the goldenrod bunch gall midge (rhopalomyia solidaginis) functions as an ecosystem engineer in an old-field ecosystem by altering the composition of arthropod species associated with a dominant host plant, solidago altissima. we also examine the suit ...200717824442
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