GEOLOGICAL SURVEY OF ALABAMA SPECIAL MAP ---
Prepared in cooperation with: Alabama Ichthyoregions
Berry H. (Nick) Tew, Jr. by Patrick E. O'Neil, Thomas E. Shepard, and E. Anne Wynn State Geologist
71h 68c 71f DRAFT 68c 68a
71g 68c Lauderdale 68b 65j 71j Jackson ECOREGIONS Limestone Madison EXPLANATION Level III Level IV
Colbert t 45a Southern Inner Piedmont Ichthyoregionn boundary 67f o 5 68d 68d m 45b Southern Outer Piedmont d Lawrence 4 e 68d Streams i Franklin 68e Morgan P 45d Talladega Upland County lines DeKalb 65a Blackland Praire Reservoirs 65b Flatwoods/Blackland Praire Margins Marshall Winston Cullman s 65d Southern Hilly Gulf Coastal Plain Marion n 67g i 67f 65f Southern Pine Plains and Hills ICHTHYOREGIONS Pl a
Cherokee n r e Etowah 5 65g Dougherty Plain 6 Blount 45d s t Tennesseea Valley e 65i Fall Line Hills
67f h 67h t u
o 65j Transition Hills Lamar Walker 67f Plateau S 65i Reservoirs 65p Southeastern Floodplains and Fayette St Clair Calhoun 68f Ridge and Valley/PiedmontLow Terraces 65q Buhrstone/Lime Hills 67h Jefferson 67f Cleburne Hills and Coastal Terraces67f Southern Limestone/Dolomite Valleys and Low Hills 67g Talladega Southern7 Plains 67g Southern Shale Valleys
Tuscaloosa 67h 67f 45a 6 Pickens 67h Southern Sandstone Ridges Shelby Clay
Ridge and Valley 67i Southern Dissected Ridges and Knobs Randolph 68a Cumberland Plateau 68b Sequatchie Valley 45b 65a 65a Tallapoosa 68c Plateau Escarpment 68 Greene Bibb Coosa Chambers 68d Southern Table Plateaus Appalachians Chilton Southwestern 68e Dissected Plateau 65b 65b 65a 65i 68f Shale Hills 65pHale Perry Sumter Lee 71f Western Highland Rim 65b 65p 71g Eastern Highland Rim Elmore 65b
Autauga 71 65d 65b 65a 71h Outer Nashville Basin 65b Macon Interior Plateau 71j Little Mountain Dallas Montgomery 75a Gulf Coast Flatwoods 65d Russell Marengo 75i Floodplains and Low Terraces 65d 75
Lowndes Plain 75k Gulf Barrier Islands and Coastal Marshes Choctaw 65p 65d Bullock Southern Coastal 65q Barbour Wilcox Clarke 65f 65q Pike 65f Butler
Crenshaw 65f 65p Monroe Conecuh Dale Henry Washington 65gCoffee 65g
65f Houston Escambia Covington Geneva 75i
20 0 20 40 60 80 Miles 75a Baldwin Mobile 20 0 20 40 60 80 100 Kilometers
75k The ichthyoregion framework presented in this poster (O’Neil and Shepard, 2007) was delineated based on the U.S. Environmental Protection Agency ecoregion concept for classifying natural environments, and the natural distribution of stream fish assemblages by drainage units. The five ichthyoregions generally contain similar species assemblages, have similar physiographic and geologic settings, and have similar hydrologic conditions. The metrics and scoring criteria for the Alabama Index of Biotic Integrity (IBI) have been calibrated to these ichthyoregions to create a statewide biological assessment tool based on fish community assemblages for evaluating the condition of aquatic resources.