Gretchen A. Meyer
Office: UWM Field Station
Phone: (262) 675-6844
B.S., Tufts University 1979
M.F.S., Yale University 1985
Ph.D., Cornell University 1992
I have broad research interests in the areas of plant-animal interactions and conservation biology. Current projects are described below.
Ecology and evolution of introduced plants
Human activity has greatly increased the movement of organisms around the world. Some exotic animals and plants can invade natural communities, where they may have effects on the native biota. Research in my lab addresses multiple questions related to exotic plants and their impacts on natural communities. One primary interest is to determine how changes in the interactions between introduced plants and their herbivores, pathogens or mutualists such as pollinators or seed dispersers affect their potential for invasiveness. Other areas of research include the role of propagule pressure in the spread of exotic plants, and how genetic changes in introduced plants contribute to invasiveness.
Much of this research has been carried out with late goldenrod, Solidago gigantea. This species is native to North America and an invasive exotic in Europe. In collaboration with Robert Johnson (Medaille College), Helen Hull-Sanders (postdoctoral associate), and Robert Clare (graduate student), I have been working with multiple populations of the plant collected from throughout the range in both the US and Europe and have carried out a number of common garden experiments with these plants. Our results have shown that plants originating from Europe have altered patterns of anti-herbivore defenses and reproductive allocation compared to plants from North America. We have also determined the cytotype of each plant in our collection.
In collaboration with James Beck (Wichita State University), Sara Hoot (UWM, Biological Sciences) and Mai Phillips (UWM, Conservation and Environmental Science), I am currently investigating genetic variation of S. gigantea in its native and introduced ranges using molecular techniques.
I have also worked with native and exotic plants in prairie and old-field communities in southeastern Wisconsin with graduate student Eric Vasquez. In collaboration with Jim Reinartz of the Field Station and Erica Young in Biological Sciences, along with Jason Mills (postdoctoral associate) and Jason Berg (graduate student) I have also been studying the spread of glossy buckthorn (Rhamnus frangula) in the Cedarburg Bog.
Effects of herbivory on plants
My research in this area has addressed questions such as: What are the effects of insect feeding on plant growth and reproduction? How do different types of damage influence plant responses? What are the mechanisms that plants use to compensate for herbivore damage? This research is motivated by the observation that some plants are able to regrow readily following herbivore feeding and their performance may equal that of undamaged plants, but the factors that influence how damaging herbivory will be are still poorly understood. I am also interested in the impacts of white-tailed deer herbivory on plant communities at the Field Station.
Phenology of bat emergence from hibernation in spring
The Neda Mine, an abandoned iron mine located near Iron Ridge in Dodge Co., supports about 150,000 bats each winter, making it among the largest hibernacula in the midwest. In collaboration with Jim Reinartz, Field Station, I have been monitoring bat activity at the mine since 2001 using an infra-red photo beam-break detection system that records the number of bats entering and leaving the mine on a 5-minute interval. We are currently using these data to examine the phenology of bat emergence in spring. In addition to the bat activity data, we also have temperature data from inside and outside of the mine collected since 1996. For the past several years we have also been collecting data on nocturnal aerial insect abundance at the Field Station to determine the relationship between night-time temperatures in spring and insect activity. The temperature data and patterns of abundance of aerial insects will help us interpret patterns of bat activity in the spring.
Mills, J.E., G. A. Meyer, J.A. Reinartz and E. B. Young. 2012. An exotic invasive shrub has greater recruitment than native shrub species within a large, undisturbed wetland. Plant Ecology 213: 1425-1436 (Download pdf)
Vasquez, E.C. and G. A. Meyer. 2011. Relationships among leaf damage, natural enemy release, and abundance in exotic and native prairie plants. Biological Invasions 13: 621-633 (Download pdf)
Mills, J.E., J.A. Reinartz, G. A. Meyer and E. B. Young. 2009. Exotic shrub invasion in an undisturbed wetland has little community-level effect over a 15-year period. Biological Invasions 11: 1803-1820 (Download pdf)
Hull-Sanders, H.M., R.H. Johnson, H.A. Owen and G.A. Meyer. 2009. Influence of polyploidy on insect herbivores of native and invasive genotypes of Solidago gigantea (Asteraceae). Plant Signaling & Behavior 4:893-895.(Download pdf)
Hull-Sanders, H.M., R.H. Johnson, H.A. Owen and G.A. Meyer. 2009. Effects of polyploidy on secondary chemistry, physiology, and performance of native and invasive genotypes of Solidago gigantea (Asteraceae). American Journal of Botany 96: 762-770 (Download pdf)
Bott, T., Meyer, G.A. and Young, E.B. 2008. Nutrient limitation and morphological plasticity of the carnivorous pitcher plant Sarracenia purpurea in contrasting wetland environments. New Phytologist 180:631-641. doi: 10.1111/j.1469-8137.2008.02575.x. (Download pdf. The definitive version is available at http://www.blackwell-synergy.com/loi/nph.)
Meyer, G.A. and Hull-Sanders, H.M. 2008. Altered patterns of growth, physiology and reproduction in invasive genotypes of Solidago gigantea. Biological Invasions 10: 303-317. (DOI: 10.1007/s10530-007-9131-z).(Download pdf)
Johnson, R.H., Hull-Sanders, H.M. and Meyer, G.A. 2007. Comparison of foliar terpenes between native and invasive Solidago gigantea. Biochemical Systematics and Ecology 35: 821-830. (DOI: 10.1016/j.bse.2007.06.005) (Download pdf)
Hull-Sanders, H.M., Clare, R., Johnson, R.H. and Meyer, G.A. 2007. Evaluation of the Evolution of Increased Competitive Ability (EICA) hypothesis: loss of defense against generalist but not specialist herbivores. Journal of Chemical Ecology 33: 781-799. (Download pdf)
Meyer, G.A., Clare, R. and Weber, E. 2005. An experimental test of the Evolution of Increased Competitive Ability Hypothesis in goldenrod, Solidago gigantea. Oecologia 144: 299-307. (Download pdf)
Weise, C.M., Meyer, G.A. and O'Brien, H. 2004. A long-term survey of the breeding birds of the Cedarburg Bog and Cedarburg Beech Woods State Natural Areas. Passenger Pigeon 66: 101-112. (Download pdf)
Meyer, GA. 2000. Effects of insect feeding on growth and fitness of goldenrod (Solidago altissima). Recent Research Developments in Entomology 3: 29-41.(Download pdf)
Meyer, GA. 2000. Interactive effects of soil fertility and herbivory on Brassica nigra. Oikos 88:433-441. (Download pdf)
Meyer, GA and Witmer, MC. 1998. Influence of seed processing by frugivorous birds on germination success of three North American shrubs. American Midland Naturalist 140:129-139. (Download pdf)
Meyer, GA. 1998. Mechanisms promoting recovery from defoliation in goldenrod (Solidago altissima). Canadian Journal of Botany 76:450-459. (Download pdf)
Meyer, GA. 1998. Pattern of defoliation and its effect on photosynthesis and growth of goldenrod. Functional Ecology 12:270-279. (Download pdf)
Meyer, GA. and Root, RB. 1996. Influence of feeding guild on insect response to host plant fertilization. Ecological Entomology 21: 270-278.
Meyer, GA. and Root, RB. 1993. Effects of herbivorous insects and soil fertility on reproduction of goldenrod. Ecology 74:1117-1128.
Meyer, GA. 1993. A comparison of the impacts of leaf and sap-feeding insects on growth and allocation of goldenrod. Ecology 74:1101-1116.
Meyer, GA and Whitlow, TH. 1992. Effects of leaf and sap-feeding insects on photosynthetic rates of goldenrod. Oecologia 92: 480-489.
Meyer, GA and Montgomery, ME. 1987. Influence of leaf age on the food quality of cottonwood foliage for the gypsy moth, Lymantria dispar. Oecologia 72:527-532.