United Stales Environmental Protection Agency Environmental Research Laboratory-Co rvallis August 1993 <&EPA Wetlands Research Update Prepared by: Richard Sumner, Regional Liaison Wetlands Research Program Mary E. Kentula, Manager Wetlands Research Program The Update Is prepared to keep those who are inferos tod in the U.S. Environmental Protection Agency's Wetlands Research Program (WRP) abreast of our activities and accomplishments. STRATEGIC RESEARCH GOALS The WRP is in the second year of implementing research towards the development of a risk-based approach to wetlands protection (Leibowitz et al. 1992a). The specific research objectives of WRP are: 1) Determine how wetlands contribute to envi- ronmental quality, both individually and as an ag- gregate within the landscape; 2) quantify the effects of stressors and landscape factors on wet- land function to assess the risks posed by the as- sociated loss and degradation of wetlands; 3} develop risk management options through the use of site prioritization and performance criteria for wetlands restoration; and 4) design and test a monitoring system that can assess wetland condi- tion and the effectiveness of risk reduction activi- ties. LANDSCAPE FUNCTION PROJECT The implementation of a risk-based approach to wetlands protection requires information on the in- teraction of wetlands with other ecosystems within broad geographic areas, including ecoregions (Omemik 1987) and watersheds. Empirical analy- sis and overlay analysis (i.e„ Geographic Informa- tion System - GIS) are two approaches being evaluated by WRP for use in landscape-scale assessments. Results from an Illinois study suggest that empirically-derived Information can be used to geographically target environmen- tal management activities, Including wet* lands restoration, where the goal Is a remediation of regional water quality prob- lems. Stream water quality and watershed character- istics were examined for 64 watersheds in Illi- nois. Statistical relationships were established between water quality (e.g., summer and win- ter nitrate-nitrite concentrations) and watershed characteristics (e.g., percent of area in agricul- ture). A hypothetical management scenario then was specified for each watershed, where- in 50 hectares of agricultural land were re- stored to wetlands. The empirical relationships were used to evaluate the change in nutrient concentrations that resulted from the simulated conversions. The study concluded that target- ing restoration activities in selected watersheds would induce greater water quality improve- ment than implementing the activities at ran- dom within watersheds. A manuscript describing the study has been submitted for publication. Watersheds or other landscape units also can be prioritized for ecosystem protection and restoration activities through a GIS-based approach. Exam- ples are given in a recent WRP publication that ------- Wetlands Research Update, Page 2 of 8 describes the "Synoptic Approach" (Leibowitz et al. 1992b). GIS-based approaches are useful when time and data, availability preclude the use of an empirical approach. However, empirical results are more reliable because hypotheses can be tested to ensure that management scenarios are not based on false assumptions. The WRP will continue its evaluation of the two assessment approaches in new studies on the prairie pothole wetlands of North Dakota, and on. wetlands in Delaware. By the end of 1993, a GIS-based assessment of North Dakota's wetland resources will have been initiated using the Synoptic Approach. Empirical studies also are planned as psirt of a comprehensive effort on prairie pothole wetlands (See Risk Reduction Project), including cooperators such as the U.S. Geological Survey (USGS). The USGS will be supplying the Project with information about the response of prairie pothole wetlands to climatic variability. This kind of information provides an understanding of the factors responsible for the formation and maintenance of wetlands within the study areia. The information also allows results obtained during a recent drought within the region to be extrapolated to wetter conditions. Concurrent with work in North Dakota, the WRP will enter into a second interagency agreement with the USGS in Delaware. The cooperative study will examine a hydrogeomorphic classification system for landscape units within the state, and whether wetlands within different units exhibit differing capacities to perform a water quality improvement function. WETLANDS CHARACTERIZATION AND RESTORATION PROJECT The WRP has commissioned'several new studies designed to demonstrate and refine WRP's "An Approach to Improving Decision Making in Wetlands Restoration and Creation" (Kentula et al. 1992). The work will culminate in a series of new publications discussing methods for (1) characterizing populations of wetlands to establish their reference condition, (2) analyzing the information gathered to establish management goals, performance criteria, and monitoring protocols for wetland restoration projects, and (3) prioritizing areas ecologically suitable for wetlands and riparian restoration. A recently implemented study builds upon past WRP work conducted in Oregon. The Oregon Wetland Study (OWS) will produce detailed characterizations of a sample of approximately 100 natural, created, and restored freshwater wetlands located in the Portland, Oregon Metropolitan Area (Magee et al. 1993). Short-term trends in wetland loss, of small (5 acre or less) isolated wetlands, has been documented in a rapidly urbanizing area. Preliminary work on the OWS compared the U.S. Fish and Wildlife Service's National Wetlands Inventory of 1981-1982 (aerial photograph dates) with the results of a WRP inventory conducted during the summer of 1992. Approximately 40% of the 233 wetlands in the entire resource population had been converted to other land uses during the ten year period. Most of the wetlands were small in size. Although conversion to urban uses was the predominant cause of wetland destruction, 23% was due to conversion to agricultural land. The conversions are significant given that an independent study within the same ecoregion documents high waterbird use of small wetlands in farmland settings (Budeau 1993). In addition to the findings on trends in wetland loss, the OWS will generate information on: (1) how natural wetlands compare with projects, (2) the relationship between land use and wetland function,.and (3) design and performance criteria for projects. The approach and results from the OWS provide a model for a companion study in the Puget Sound area of Washington, scheduled for implementation late in 1993. Cooperators from the University of Washington will work on the WRP-sponsored study to examine how reference wetland condition can be used as a tool for designing and monitoring wetland mitigation banks. Reference sites have been used for evaluating the condition of certain types of ecosystems, particularly small streams and rivers (Hughes et al. 1986). Approaches for establishing reference wetland condition are expected to be more problematic given the variability within this type of ecosystem. Three more WRP-sponsored studies that will help restoration planning efforts are being conducted in the San Luis Rey River watershed ------- Wetlands Research Update, Page 3 of 8 of California, and the Upper Arkansas River watershed of Colorado. The overall objective of the studies is the development of methods for prioritizing the ecological suitability of sites for riparian restoration. Restoration planning for entire watersheds must be performed at several scales of Increasing complexity and precision. Both environmental and human factors must be considered when prioritizing sites to maximize the ecological function and sustainability of restoration. Studies in the San Luis Rey River and ' Upper Arkansas River watersheds are being conducted in cooperation with the University of California, Berkeley and Utah State University. One recently completed task was the stratification of the San Luis Rey watershed by geomorphic setting, using an overlay of existing primary source data. The information was used to develop a preliminary list of environmental indicators for evaluating the restoration . potential of stream reaches. More intensive field sampling is being conducted within the reaches showing higher restoration potential. A second task was the gathering of low-level videography data for both watersheds. Videography is being evaluated as part of a complementary approach for identifying stream reaches with potential for riparian restoration. Publications describing results from these studies should become available beginning in the summer of 1994. WETLANDS FUNCTION PROJECT Information on the relationship between stressors and degradation of wetland function is needed for a risk-based approach to wetlands protection. New research sponsored by the Project will produce indicators for characterizing wetland condition and function by wetland type, along a gradient of environmental disturbance. One major study currently underway explores the role of bottomland hardwood riparian systems as buffers for maintaining water quality. Preliminary findings of research show significant reductions in concentrations of herbicides in runoff moving through mature riparian systems of the Southeastern Coastal Plain. Nevertheless, the concentrations of herbicides entering surface waters adjacent to riparian buffers can remain significant. The fate of the herbicides within the riparian system is being studied. The role of riparian forest buffer systems in maintaining water quality in intensively managed agricultural watersheds is the subject of a cooperative study with the University of Georgia. Field work is being conducted at a research watershed managed by the USOA Southeast Watershed Research Laboratory at Trfton, Georgia. Researchers are examining the movement of alachlor and atrazine from a conventional corn production system through a mature riparian buffer system. They also are following the movement of the same chemicals through riparian systems that are managed differently (e.g., clearcutting versus selective cutting). Results of these studies will be correlated with information gleaned from surveys of macroinvertebrates conducted within the various riparian buffer systems, as well as within surface waters affected by different farm practices. The organisms might prove to be important environmental indicators for monitoring the condition of riparian buffers receiving herbicide polluted waters. A similar study effort is being conducted in North Dakota. Researchers are exploring whether vegetation buffers surrounding prairie pothole wetlands reduce sediment input and thereby sustain wetland integrity and function. Close field coordination between WRP and the U.S. Fish and Wildlife Services (USFWS) Northern Prairie Wildlife Research Center is facilitating access and the timely instrumentation of prairie wetlands for evaluating the effects of sedimentation on wetlands within areas of differing farm practices. In an initial study, semipermanent wetlands with a range of adjacent upland buffer widths and upland agricultural practices were selected within the Glaciated Plains and Missouri Coteau Ecoregions for field sampling. In a second study, 20 seasonal wetlands in the Missouri Coteau were selected for controls (e.g., USDA Conservation Reserve Program enrollments ------- Wetlands Research Update, Page 4 of 8 or native prairie watersheds) or for treatments (e.g., tilled watershed or tillage with vegetated buffer strip). Data collected from the sites by cooperators from the USFWS will be analyzed to quantify changes in wetland condition attributed to sedimentation. Researchers then will attempt to correlate sedimentation rates within the wetland to farm practices conducted adjacent to the wetlands. Information generated by the Project will help wetland managers better understand the capacity of individual wetlands to withstand disturbance. It should prove useful to states developing management strategies and the bioeriteria needed to sustain wetlands for their aquatic life use. RISK REDUCTION PROJECT The WRP's proposed risk-based framework for wetlands protection has three components: risk assessment, risk management, and monitoring (Leibowitz et al. 1992a). The goal of the Risk Reduction Project is to formalize the risk framework and to develop technical tools (e.g., indicators for risk assessment approaches) necessary for implementation. The previously described WRP projects will contribute and interact with the Risk Reduction Project to produce integrated risk assessments, beginning with prairie pothole wetlands in North Dakota. The WRP's integrated study of prairie pothole wetlands will entail multiple risk assessment approaches at several spatial scales, including model-based, synoptic, and field sampling approaches. The Landscape Function Project will provide the broad perspective by deriving landscape-scale indicators of function (e.g., the mosaic of wetland types needed to support habitat) useful for setting wetland management goals (i.e., value). At the same time, the Wetland Function Project will quantify the responses of individual wetlands to stressors (e.g., functional loss caused by sedimentation) and will assess possible technical approaches for managing the risks to the wetland resource (e.g., environmental buffers for controlling nonpoint source pollution). The Wetland Characterization and Restoration Project will gather field data with which modeling and assessment analysis can be performed. The Project also will evaluate the replacement potential of different wetland types. The WRP anticipates making significant headway on its risk reduction studies because of the recent assignment of a senior scientist to lead the Project. Dr. Jim Wigington is working with the other project leaders and scientists to draft a project work plan. The plan will outline specific research and assessment activities that will be conducted in the prairie wetlands. It will be submitted for peer review in early 1994. EMAP-WETLANDS PROGRAM the Environmental Monitoring and Assessment Program (EMAP) is designed to characterize the condition of the Nation's ecological resources on regional and national scales and over long periods of time. The wetland-resource component of EMAP (EMAP-Wetlands) is developing a program, in cooperation with the USFWS, to assess the status and trends of wetland condition and extent (Leibowitz et al. 1991). The USFWS National Wetlands Inventory (NWI) will provide EMAP-Wetlands with information about the geographic coverage and extent of wetlands. The EMAP-Wetlands program then will couple the NWI information with probability-based sampling to estimate wetland condition by wetland class. Pilot studies for the Program have been implemented in the Midwest (prairie pothole wetlands) and Louisiana (coastal salt marsh). Results from a pilot study in the prairie pothole region suggest that the proportion of wet basins, number of species of emergent hydrophytes, and sedimentation rates may be good indicators of palustrine emergent wetland condition in the Midwest. Results from a pilot study in the coastal salt marsh of Louisiana suggest that plant biomass and plant stem height/diameter may be good indicators of salt marsh condition. EMAP-Wetlands and the USFWS Northern - Prairie Research Station developed an interagency agreement to develop indicators and measurement protocols for evaluating the condition of prairie pothole wetlands. Beginning in 1992, indicators were tested in temporary, seasonal, and semi-permanent wetlands within 4-square mile plots. Plots . were selected in both intensely developed (farmed) and sparsely developed (prairie grass) landscapes in four ecoregions. A similar pilot study was initiated in 1991 to develop indicators of coastal salt marsh condition. Three hydrologic basins in the ------- Wetlands Research Update, Page 5 of 8 Mississippi Delta have been sampled in cooperation with Louisiana State University. In each basin six minimally impacted and six degraded sites were identified based upon their vegetation-to- open water ratio. Measurements taken at the coastal sites include characteristics of landscape (e.g., land cover mosaic), vegetation (e.g., plant species), soils (e.g., organic content), and hydrology (e.g., redox potential). Regional demonstration studies in the Midwest (prairie potholes) and the Gulf of Mexico (salt marsh) are planned for 1994. A primary objective of the demonstrations will be the evaluation of the variability of 'pilot project" indicators across broad geographic regions. The EMAP-Wetlands Program will be ready for implementation once the demonstration projects are completed. Statistical summaries describing the condition of the wetland classes then would be prepared annually. EMAP- Wetlands and the USPWS would periodically prepare assessment reports describing status and trends in wetlands acreage (NWI) and condition (EMAP). Information from the reports would be used to relate changes in wetlands to management practices, global climate change, sea level rise, and other stress or influences on the wetland ecosystem. CONSTRUCTED WETLANDS PROJECT The Project continues work on evaluating the performance of constructed wetlands built primarily for the purpose of treating municipal wastewater. Work is progressing in four areas. A wetlands treatment database is being developed using dBase IV software. The database will be a collection of existing information from all wetlands in North America known to be treating wastewater, except for agricultural and acid mine drainage systems (Knight et al. 1992). The reliability and cost of both free water surface and subsurface flow wetlands are discussed in a recent publication supported by the project (Reed and Brown, 1992). A study of pilot scale subsurface flow wetlands is being conducted at Tennessee Technological University. Objectives of this project are the evaluation of: the kinetics of BOD removal and nitrogen removal, including the effects of seasonal temperature changes; the factors affecting nitrogen removal; the plugging of rock media pores; the effect of system configuration on treatment performance; and the effect of water level fluctuations on treatment performance. A study to evaluate the performance of on site (individual home) subsurface flow wetlands is being conducted by the Arkansas Environmental Academy. The study will monitor six to eight on site systems for a variety of water quality parameters. Monitoring should begin in August 1993, and continue into 1995. The final study is an evaluation of free water surface wetlands to determine their habitat quality. Preliminary findings from the studies suggest that the habitat quality of some of the systems resembles the quality associated with neighboring natural wetlands (McAllister 1992 and McAllister 1993). TECHNICAL INFORMATION TRANSFER ACTIVITIES Over the last year, the WRP contributed resources and expertise to the following activities and studies performed in collaboration with the EPA Regional Offices and several of the states. * Distribution of a Permit Tracking System (Holland and Kentula 1991) to states interested in compiling wetland restoration information from permit/project files. Results generated from the "PTS" can be used to set geographic priorities and goals for future projects. * Publication of a report documenting the importance of irrigated wetlands as bird habitat in the Colorado Plateau region (Adamus 1993). The report describes significant indicators of habitat function, and a documented procedure for rapidly evaluating the suitability of irrigated wetland habitat for birds. * The drafting of the Oregon Freshwater Wetlands Assessment Methodology. The Oregon Division of State Lands is basing the Oregon Method, in part, on information gleaned from the 'Method for the Comparative Evaluation of Nontidal Wetlands in New Hampshire" (Ammann and Stone 1991). The Oregon Method differs from the New Hampshire Method, as the former places greater emphasis on the disciplines of landscape ecology and ecological risk assessment. Draft copies of the Oregon Method are scheduled for distribution in the fall of 1993. ------- Wetlands Research Update, Page 6 of 8 * The development of environmental indicators for wetlands evaluation. A study is being completed by the University of Massachusetts at Amherst, in cooperation with EPA Region 1 (Boston). Expected outputs from the study are: (1) Ah "example" state wetland assessment methodology that can be used as a template by states wanting to develop their own standard methodology, and (2) a list of indicators of wetland function within urban landscapes that can be integrated into state wetland assessment methodologies. Products dre scheduled for completion during the summer of 1994. * The development of technical approaches for'prioritizing riparian restoration and protection efforts within the Delaware River Basin, Kansas. The study is being completed by the Kansas Biological Survey, in cooperation with EPA Region 7 (Kansas City). Study results should help advance the development of Best Management Practices that properly reflect the assimilative capacity of riparian systems for controlling nonpoint source pollution in agricultural settings. A workshop was conducted in June 1993 in Topeka to review preliminary criteria. Final products are expected during the spring of 1994. * The development of technical approaches for prioritizing wetland restoration projects within the Tensas Basin, Louisiana. The study is being completed by the USDA Soil Conservation Service, in cooperation with EPA Region 6 (Dallas). It employs the use of best professional judgment and WRP's Synoptic Approach. The project will complement local efforts to complete a Comprehensive Tensas River Basin Plan. A final project report is scheduled for December 1993. * An evaluation of the Synoptic Approach as a tool for prioritizing wetlands restoration activities in northeastern Illinois. The study is being completed by the USFWS Chicago Metro Wetlands Office. Final products are scheduled for completion in early 1994. * The development of technical approaches for establishing wetlands biocriteria in Minnesota. Coordination continues with EPA Region 5 (Chicago) and the State of Minnesota for the development of a study plan for analyzing water quality and macroinvertebrate data collected at reference wetland sites within the North Central Hardwoods Ecoregion of Minnesota. * An evaluation of plants and amphibians as environmental indicators of wetland disturbance within urban settings (King County, Washington). The study is being completed by the University of Washington, in cooperation with EPA Region 10 (Seattle). Final reports are scheduled for early 1994. * The development of approaches for establishing reference wetlands condition within the Southeastern Plains Ecoregion of South Carolina and North Carolina. A sampling plan for the study should be completed in late 1994. Project planning continues with EPA Region 4 (Atlanta), the states of North Carolina and South Carolina, and EPA's Health and Ecological Criteria Division (Washington, DC). * The development of approaches for selecting and characterizing a reference population of vernal pool wetlands within the Central Valley of California. Information gathered from the sites would be used to establish wetland restoration goals and monitoring protocols. A sampling design and evaluation report should be completed late in 1994. * The description of a conceptual model for ecological risk assessment for bottomland hardwoods in the Tifton-Vidalia Upland of Georgia. The report was completed by the University of Georgia. It was commissioned to assist research planning efforts within the Risk Reduction Project. The report will be published as an EPA document in September 1993. * Project oversight for two extramural study efforts in the Sandhills region of Nebraska. Both projects will be completed by the University of Nebraska. They are entitled, "The influence of landscape scale on avian abundance and richness in Sandhills Wetlands", and "The dynamics of Sandhills wetlands and the hydraulic connection with the High Plains Aquifer". * The preparation of a quality assurance plan for the Estuarine Habitat Assessment Protocol. The project is being completed by the University of Washington, in cooperation with EPA Region 10. A final project report is scheduled for completion in August 1993. ------- Wetlands Research Update, Page 7 of 8 PERSONNEL NOTES The WRP program welcomes Dr. Jim Wigington. Jim brings to the Program his expertise and experience as a forest hydrologist. His previous research' at EPA's Corvaltis Laboratory was on the topic of watershed response to acid deposition. The Program bids farewell to Dr. Janet Keough. She left EPA's Duluth Laboratory to return to the U.S. Fish and Wildlife Service's National Wetlands Research Center in Lafayette, Louisiana. IN CLOSING If this Update was mailed to you, you're on our mailing list and will continue to receive Program information. If you wish to be added to our mailing list, please contact the Wetlands Research Program (Attn: Kristina Miller), EPA Environmental Research Laboratory, 200 SE 35th Street, Corvallis, OR 97333. Inquiries about specific research projects can be directed to Richard Sumner at the above address. He will direct the inquiry to the appropriate principal investigator. RECENT PROGRAM PUBLICATIONS AND CITED UTERATURE Detenbeck, N.E., C.E. Johnston, and G.J. Niemi. 1993. Wetland effects on lake water quality in the Minneapolis/St. Paul metropolitan area. Landscape Ecology. 8(1): 39-61. Holland, C.C. and M.E. Kentula. 1991. The Permit Tracking System (PTS): A User's Manual. EPA/600/8-91/054. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Hughes, R.M., D.P. Larson, and J.M. Omemik. 1986. Regional reference sites: a method for assessing stream potentials. Environmental Management 10(5): 629-635. Kentula. M.E.. R.E. Brooks, S.E. Gwin, C.C. Holland, A.D. Sherman, and J.C. Sifneos. 1992. An approach to improving decision making in wetland restoration and creation. Edited by A.J. Hairston. EPA/600/R-92/150. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Knight, R.L., R.H. Kadlec, and S.C. Reed. 1992. Wetlands Treatment Data Base. In: Proceedings of the 65th Annual Conference of the Water Environment Federation, New Orleans, September 1992, Volume IX, 'General Topics,' WEF Order No. C2009. The following publications with journal citations may be obtained through library sources. Inquiries about EPA publications may be directed to EPA's Center for Environmental Research Information (CERI), 26 West Martin Luther King Boulevard, Cincinnati, OH 45268. Telephone (513) 569-7562. Adamus, P.R. 1993. Irrigated wetlands of the Colorado Plateau: Information synthesis and habitat evaluation method. EPA/600/R-93/071. U.S. Environmental Protection Agency, Environmental Research Laboratoiy, Corvallis, OR. Ammann, A.P. and A. Ltndley Stone. 1991. Method for the Comparative Evaluation of Nontidal Wetlands in New Hampshire. NHDES-WRD-1991-3. New Hampshire Department of Environmental Services, Concord, NH. Budeau, D. 1993. Migratory waterfowl and shorebirds refuel in Willamette Valley farmed wetlands. Oregon's Wildlife Resources. Volume 3, Number 1. Oregon State University Extension, Corvallis, OR. Leibowitz, N.L, L Squired, and J.P. Baker. 1-991. Research plan for monitoring wetland ecosystems. EPA/600/3-91/010. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Leibowitz, S.G., E.M. Preston, LY. Arnaut, N.E. Detenbeck, CA Hagley, M.E. Kentula, R.K. Olson, W.D. Sanville, and R.R. Sumner. 1992(a). Wetlands Research Plan FY92-96: An Integrated Risk-Based Approach. Edited by Joan P. Baker. EPA/600/R-92/060. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Leibowitz, S.G., B. Abbruzzese, P.R. Adamus, LE. Hughes, J.T. Irish. 1992(b). A synoptic approach to cumulative impact assessment: A. proposed methodology. Edited by S.C. McCannell and A. J. Hairston. EPA/600/R- 92/167. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Magee, T.K., S.E. Gwin, R.G. Gibson, C.C. Holland, J.E Honea, P.W. Shaffer, J.C. Sifneos. and M.E. Kentula. 1993. Research plan and ------- Wetlands Research Update, Page 8 of 8 methods manual for the Oregon Wetland Study. Document production by K. Miller. EPA/600/R-93/072. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. McAllister, LS. 1993. Habitat quality assessment of two wetland treatment systems in the arid West - A pilot study. EPA/600/R- 93/117. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. McAllister, LS. 1992. Habitat quality assessment of two wetland treatment systems in Mississippi - A pilot study. EPA/600/R- 92/229. U.S. Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR. Omernik, J.M. 1987. Ecoregions of the conterminous United States. Annals of the Association of American Geographers. 77:118- 125. Reed, S.C. and D.S. Brown. 1992. Constructed wetland design - the first generation. Water Environment Research. Volume 64(6): 776-781. United States Environmental Protection Agency Corvallis Environmental Research Laboratory 200 Southwest 35th Street Corvallis, Oregon 97333 ------- |