a Guide to Management - USGS National Wetlands Research Center

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ACKNOWLEDGMENTS We are grateful to Karla Brandt, Robert Dye, Judy Hancock, Paul E. Moler, Erika Simons, and Andy Vince for helping with field work with enthusiasm and without compensation. We are a1 so grateful to the individuals cited in the text for unselfishly sharing their expertise during what often were lengthy conversations. We thank many staff members of the Florida Department of Natural Resources, Florida Game and Fresh Water Fish Commission, and St. Johns Water Management District for providing access to many areas, a1 lowing personnel to spend time he1 ping us, and in Wekiwa Springs State Park, for coming to our rescue. We thank David Hall of the University of Florida Herbarium for identifying many specimens and both he and Paul E. Moler for suggesting improvements to parts of the manuscript. Finally, the senior author is forever grateful to many people for the knowledge and insights gained during this project and the many years preceding it: James Beauchamp, Jim Buckner, Archie Carr, Steve Christman, John and Katherine Ewe1 , Robert Godfrey, Dana Griffin, David Hal 1, Judy Hancock, El 1 i son Hardee, Larry D. Harris, He1 en Hood, Charles Houder, Walter Judd, David Maehr, Paul E. Moler, Tom Morris, Reed Noss, Buford Pruitt, Daniel Ward, Donald Younker, and others.
The natural :st Will ;am Bartram trav- elled widely in north Florida in the mid-1700's. In describing the country along the old Spanish highway between Paynes Prairie and St. Marks, he wrote: "Next morning we arose early, and proceeding, gradually descending again, and continued many miles along a flat, level country, over delightful green savannas, decorated with hommocks or islets of dark groves, con- si sting of Magnol ia grandifl ora, Morus tilia, Zanthoxylon, Laurus Borbonia, Sideroxyl on, Quercus sempervi rens, Halesia diptera, Call icarpa, Corypha palma, &c. There are a1 ways groups of whitish testaceous rocks and sinks where these hommocks are." Other hammocks contained "Live Oak, Mulberry, Magnol i a, Palm, Zanthoxyl on, &c" (Bartram 1791, p. 189). Twentieth century ecologists (e.g., Harper 1914; Laessle 1942; Davis 1943) use the term hammock, just as Bartram used the term hommock, to denote is- lands of dense hardwood forests in the vast sea of Florida's pine forests, swamps, and savannas. The hammocks invariably contain oak trees and are often dominated by them. Another type of dense hardwood forest devoid of oak trees and dominated by bay trees (Gordonia 1 asianthus, Magnol ia vir- giniana, and Persea palustris) is re- ferred to as bayhead, baygal 1, and bay swamp. The term hammock is also com- monly used by the people of Florida, and topographic maps (U. S. Geol ogi cal Survey) of the Florida peninsula show the names and locations of hundreds of hammocks. Gulf Hammock is the largest, in excess of 100,000 acres. CHAPTER 1. IINTRODUCTIOM Two or three hammocks are about 20,000 acres in extent, and the rest are un- der 10,000 acres. Many are just a few acres associated with a 1 imerock out- crop, a small depression, or the shore of a stream or lake. The term hydric hammock applies to those hammocks or parts of hammocks whose species composition is restricted or modified by occasional flooding . Hydri c hammocks are widely scattered throughout Florida from St. Marks (Wakulla County) east and south to just north of Lake Okeechobee (Figure 1). The largest contiguous tracts oc- cur along the gulf coast and the St. Johns River. St. Marks National Wild1 ife Refuge contains the western- most large area, and Myakka River State Park the southernmost. Hammocks south of Lake Okeechobee are subtropi- cal and are quite different in charac- ter and species composition. Some of the larger and better-known areas of hydric hammock are listed in Table 1. Numerous other hydric hammocks exist. For example, ten other hydric hammocks ranging from 200 to 1,000 acres in area were identified in an inventory of habitats of Alachua County, FL (Duever 1987) . Hydri c hammocks a1 so may extend north of Florida along the Atlantic coast, but if so, their extent and nature are undocumented. Hydri c hammock probably occupied about a half mill ion acres of 1 and when Columbus landed in the New Worf d. Clearing for real estate development (Palm Coast), pine plantations (Gulf
Page 2 and 3: t ,blzrnry Na'jonal Wetlands Resear
Page 4 and 5: f$c 3piniccs and rec~mendations exp
Page 6 and 7: CONVERSION TABLE Metric to U.S. Cus
Page 8 and 9: 5.4 WATER MANAGEMENT . . . . . . .
Page 10 and 11: 28 Effects of forest thinning on th
Page 14 and 15: SAN FELASCO ORANGE LAKE SILVER SPRI
Page 16 and 17: sweetgum timber, with values reachi
Page 18 and 19: temperate-zone di stpi butions that
Page 20 and 21: Table 2. (Continued). Scientific na
Page 22 and 23: from numerous field trips and consu
Page 24 and 25: Species Table 3. Endangered or thre
Page 26 and 27: coast is particularly important for
Page 28 and 29: along creeks in flatwoods and sand-
Page 30 and 31: 3.4 PRE-COLUMBIAN HUNiiNG AND GATHE
Page 32 and 33: Figure 4. Hog pen in coastal hydric
Page 34 and 35: were heavily looted, and most of th
Page 36 and 37: 4.1 OWNERSHIP CHAPTER 4. PRESENT US
Page 38 and 39: Figure 8. Limerock pit in inland hy
Page 40 and 41: still proceeds in these areas and c
Page 42 and 43: Figure 11. An extensive clearcut of
Page 44 and 45: Figure 14. Bedding rows for pine se
Page 46 and 47: Figure 16. Two-year-old loblolly pi
Page 48 and 49: Table 7. Nutrient and sediment expo
Page 50 and 51: such as pine flatwoods, prairie, or
Page 52 and 53: . loo/: 90 0. virginiano Q. @ incon
Page 54 and 55: volume and will hold all the runoff
Page 56 and 57: experiment, seed7 ing density was s
Page 58 and 59: canoeing (on adjacent rivers and in
Page 60 and 61: 9 1940 1980 2020 2060 YEAR Figure 2
Page 62 and 63:
In prehistoric times, periodic fire
Page 64 and 65:
Figure 24. lnvasion of hydric hamnx
Page 66 and 67:
14. Is recreational use important a
Page 68 and 69:
the canopy, health, and straightnes
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a1 though there is considerable var
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oots to which it is root-grafted, b
Page 74 and 75:
cattle. Prescribed burns often are
Page 76 and 77:
eftluent wniie returnir~y Ii~e whta
Page 78 and 79:
- the mesic hammock upslope also ha
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arred owl, flycatchers, tufted titm
Page 82 and 83:
Figure 29. Debris pile on a hydric
Page 84 and 85:
. -.... 1 IYGL), wi~iit~ iire an ef
Page 86 and 87:
FE r~t, si-iliai i ar.eas itray not
Page 88 and 89:
in order to protect watershed, wi l
Page 90 and 91:
management efforts that can benefit
Page 92 and 93:
Bryant, W.C., editor. 1872. Davjs,
Page 94 and 95:
Harlow, R.F. 1959. An evaluation of
Page 96 and 97:
I S F n A understanding . American
Page 98 and 99:
Soil Sci. Soc. Amer. Proc. 47:591-
Page 100 and 101:
Tuschall , J.R., P.L. Brezoni k, an
Page 102:
Hvdrick Hammocks: a Guide to Manage
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a Guide to Management - USGS National Wetlands Research Center

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