What We Do
The refuge practices various management techniques to provide optimum habitat for wintering waterfowl. Refuge lands offer different habitats for a diversity of wildlife species. Habitats found on鈥痶he refuge include; 39 acres of open administrative land; 1,256 acres of agriculture鈥痑nd moist-soil open land (the agriculture/moist-soil ratio varies from year to year); 777 acres of鈥痓ald cypress/tupelo forest; 5,719 acres of mixed bottomland hardwood forest; 89 acres of grassland;鈥119 acres of open water; 373 acres of sandbar; 32 acres of scrub/shrub; and 1,047 acres of upland鈥痜orest. The Sunk Lake Public Use Natural Area includes three acres of administrative lands; 274 acres of鈥痓ald cypress/tupelo forest; 1,466 acres of mixed bottomland hardwood forests; and 130 acres of open鈥痺ater. The total current deeded acreage managed in the Lower Hatchie Refuge is 9,451 acres. The Sunk Lake Public Use Natural Area includes a total of 1,873 acres.鈥
Management and Conservation
Moist Soil Impoundments
Moist soil wetlands occurr where openings exist in bottomland hardwoods.鈥疐orest openings are often caused by high winds, catastrophic floods, beavers, fires, etc. Man-made impoundments are commonly managed as moist-soil wetlands. 鈥疢oist-soil areas are typified by seed-producing annuals such as smartweed, wild millet, and sprangletop. 鈥疨lanting moist-soil areas is not necessary because native plant seeds are abundant in frequently flooded soils. 鈥疧ver 2,500 pounds per acre of seed can be produced in a properly managed moist-soil area. 鈥(Wetland Management for Waterfowl-A Handbook 2007)
鈥疢oist-soil habitats are an integral part of managing public wetlands for waterfowl as these food resources鈥痑re provided in large part only on state and federal lands. The Lower Hatchie refuge, and the its river floodplain, supply food resources such as barnyard grass, sprangletop,鈥痵martweeds, rice cut-grass, and a host of other beneficial herbaceous plant species. The refuge provides鈥痚arly successional habitats which play a key role in the migration patterns of mid-continent鈥痺aterfowl and other migratory birds. The refuge鈥檚 future will, in large part, be鈥痠nfluenced by resource management, which actively benefits waterfowl, including moist soil-habitat. The鈥痬anagement of the refuge鈥檚 moist soil units will continue to address habitat issues, which affect migratory鈥痓ird populations, in keeping with refuge goals and establishing purposes.
There are approximately 1,256 acres of agriculture/moist-soil open lands at Lower Hatchie.鈥疘n any given year, approximately 50 percent of these lands are managed for agricultural production鈥痑nd 50 percent are managed for moist soil. The ratio varies, though, from year-to-year due to river鈥痜looding and other factors. Croplands are managed under cooperative agreements with local鈥痜armers, who grow corn, soybeans, and winter wheat in rotation.
Bottomland Hardwood Forests鈥
The 5,719 acres of mixed bottomland hardwoods on the refuge consist of black willow, eastern鈥痗ottonwood, overcup oak, cherrybark oak, willow oak, water oak, Nuttall oak, sugarberry,鈥痓ald cypress, sweet pecan, bitter pecan, sweetgum, and green ash. Forest management practices鈥痑re used to maintain optimal diversity of forest habitat for wildlife management鈥痯urposes. Mast production in the bottomland hardwood habitats provide an important food source鈥痜or a wide variety of wildlife, including migratory waterfowl, deer, squirrel, and turkey. During winter鈥痑nd spring, backwaters typically flood thousands of acres of bottomland hardwoods,鈥痯roviding valuable waterfowl habitat. The Sunk Lake Public Use Natural Area contains 1,466 acres鈥痮f bottomland hardwood forest with many of the same species. No forest management practices鈥痑re performed on the Sunk Lake forest.
Twenty-five million acres of bottomland hardwood forests once dominated the Lower Mississippi Alluvial Valley. 鈥疶oday, over 95% of this important wetland habitat has been cleared for agriculture and other purposes. Due to the disappearance of bottomland hardwood forests, staff at the Hatchie refuge plant corn to replace the acorns that were once an essential food for migratory waterfowl. 鈥
Farming
Agricultural crops play an important role in migratory bird management, as they provide a source of high-energy carbohydrates needed during periods of cold weather. 鈥疶ypically, refuges rotate crops and moist soils to ensure a readily available source of food for wildlife, and to meet refuge objectives set forth in the West Tennessee National Wildlife Refuges Conservation Plan. 鈥疉creage varies from year to year, based on management needs. 鈥疶hese crops are left standing in the fields and provide supplemental forage for resident and migratory wildlife, specifically migratory waterfowl.鈥
The refuge鈥檚 farming program will continue to address habitat issues that affect migratory bird populations. 鈥
Our Projects and Research
Waterfowl Surveys
The West Tennessee Refuges Complex manages over 3,000 acres of waterfowl impoundments, and approximately 52,000 acres of bottomland hardwoods and permanent water, which provide the necessary food resources and other habitats required by waterfowl. 鈥疶hese Tennessee refuges are located on the northern edge of the wintering grounds, and host several species of ducks and geese from October through March. 鈥疍uring this period, selected areas are surveyed once every two weeks from the ground; however, once per year each refuge is surveyed from the air to ensure that birds in inaccessible areas are counted and to contribute waterfowl survey numbers to the nationwide Mid-Winter Waterfowl Survey. The purpose of these surveys is to document the number of waterfowl species observed as well as the number of birds utilizing the refuges, and to help natural resource professionals understand the continually changing migration patterns of waterfowl.
Many times we are asked as to how we count waterfowl. Counting large numbers of birds is a skill that is developed over many years, and is mentored from one biologist to another. 鈥疘nitially, an inexperienced observer is taught to recognize what a small number of birds looks like, and then to increase that number incrementally. 鈥疐or example, a surveyor learns what five birds look like, then ten birds, all the way up to one thousand birds. 鈥疪ealistically, as the number of birds to be counted rises, so does the margin of error, as it is much more accurate to count five birds than to count one thousand birds. 鈥疶hus, waterfowl survey numbers are simply estimates which are highly influenced by the bias and expertise of the observer. 鈥 Generally, birds do not gather in large concentrations, but are scattered in smaller groups over several impoundments. 鈥疊ecause the birds are in smaller groups, the count is more accurate as the surveyor counts the birds in each impoundment and then combines the totals to arrive at a final number. 鈥疕owever, with extremely large numbers, such as the estimated 90,000 ducks observed sitting together within the West Tennessee NWR Complex in 2010, the surveyor counts in one thousand duck blocks and then totals the number of blocks. 鈥 Ultimately, the most important information derived from these surveys is not the actual number of birds, but the population trend, as managers need to know if bird numbers are increasing or declining, not only within one year, but also from year to year. 鈥
Law Enforcement
Law Enforcement is critical to every aspect of wildlife conservation. The mission of the Law Enforcement program is to support the administration of the National Wildlife Refuge System through management and protection of natural, historical, and cultural resources, property, and people on lands and waters of our National Wildlife Refuges.