Field Notes
U.S. Fish & Wildlife Service
Field Notes Entry   
Deeprooted Sedge Research Underway at Several National Wildlife Refuges
Southwest Region, June 9, 2005
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The deeprooted sedge research consortium is pushing ahead with research projects for 2005. Dr. Warren Conway with Stephen F. Austin State University has recruited a graduate student to launch studies at Anahuac NWR, Attwater Prairie, and the Texas Nature Conservancy Texas City Prairie Preserve. Sampling plots have been established at all three locations, and data collection is underway. Field research will focus on response of deeprooted sedge to different combinations of prescribed fire, herbicide, and season of treatment, and response of native vegetation to removal of deeprooted sedge.

Laboratory and greenhouse research will include seed germination studies designed to evaluate the effects of fire and herbicide treatments on seed germination, and seed bank composition; seed production studies using seed biomass estimation techniques utilizing phytomorphological measurements to estimate the kg seed production for deeprooted sedge on a landscape scale; and estimates of seasonal nonstructural carbohydrate trends in order to maximize herbicide efficacy.

Deeprooted Sedge is a non-native invasive weed that has spread rapidly in the coastal plain of the southern United States and threatens native plant diversity and wildlife habitat in the Coastal Prairies and Bottomland forests of the southeast. Experts agree that it is among the most serious invasive species in the southeast United States. Deeprooted sedge is well established on a number of National Wildlife Refuges and preserves managed by the USFWS, TNC, and Texas Parks and Wildlife, and threatens the native plant and animal resources these lands were set aside to protect.

Contact Info: Martin Valdez, 505-248-6599, martin_valdez@fws.gov
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