Department of Biology
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Professor of Aquatic Biology & Director of Edwards Aquifer Research and Data Center Phone: 512-245-3581 Fax: 512-245-2669 E-mail: gl01@txstate.edu Mailing Address Edwards Aquifer Research and Data Center 248 Freeman Building Texas State University San Marcos, TX 78666 
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Research Interests
The Edwards Aquifer Research and Data Center (EARDC) was established in 1979 by special funding for Southwest Texas State University to provide a public service in the study, understanding and use of the very fragile natural resource, the Edwards Aquifer. The Aquifer is a unique, world-renowned karst aquifer which is made up of porous, permeable limestone. It supplies water of exceptional quality to 1.5 million people in the San Antonio area and neighboring cities. Springs from the Aquifer feed the Comal and San Marcos Rivers which provide base flow in the Guadalupe River system and support the habitat for at least four endangered species. EARDC takes an active role in water quality monitoring and education issues. We conduct basic and applied research related to the Aquifer in the area of aquatic biology, geochemistry, and hydrogeology. Our laboratory uses a rigorous quality assurance program including split samples with 17 other laboratories and blind samples provided by the U. S. Environmental Protection Agency. In addition, the Texas Department of Health certified our Laboratory to perform bacteriological testing of water. The specialized water analyses available include standard chemical analyses for anions, cations, and metals; pesticides and other organic carbons; bacteriological analyses; and bio-monitoring. Research projects include:
Research Reports
Longley, G. 1973. Aquatic Insect Study - Environmental Impact Statement on Upper Navasota River. Southwest Research Foundation, San Antonio, Texas.
Young, W.C., G. Whiteside, G. Longley and N. Carter. 1973. The Guadalupe-San Antonio-Nueces River Basins Project. Phase I: Review of Existing Biological Data. Texas Water Development Board. 400 pp.
Longley, G. 1974. Water Quality Study of Kickapoo Creek Watershed. United States Department of Agriculture, Soil Conservation Service, Temple, Texas. 8 pp.
Longley, G. 1975. Environmental Assessment - Upper San Marcos River Watershed. United States Department of Agriculture, Soil Conservation Service, Temple, Texas. 367 pp.
Longley, G. 1977. Status of Typhlomolge (=Eurycea) rathbuni, the Texas Blind Salamander. U.S. Department of the Interior, Fish and Wildlife Service, Albuquerque, New Mexico. 78 pp.
Longley, G. 1977. Preliminary report of biological investigation - Valdina Farms Sinkhole - Medina County, Texas. Edwards Underground Water District, San Antonio, Texas. 32 pp.
Longley, G. and H. Karnei. 1978. Status of Satan eurystomus Hubbs and Bailey, the Widemouth Blindcat. Contract No. 14-16-0002-035. U.S. Fish and Wildlife Service. 48 pp.
Longley, G. and H. Karnei. 1978. Status of Trogloglanis pattersoni Eigenmann, the Toothless Blindcat. Contract No. 14-16-0002-77-035. U.S. Fish and Wildlife Service. 54 pp.
Whiteside, B. and G. Longley. 1978. Big Sandy Creek Project. Report to Teknekron Energy Resource Analysts (TERA Corp.) Dallas, Texas. 27 pp.
Longley, G. and C. Cline. 1983. Water Quality Investigations Blue Wing Lakes, Bexar Co. Report to Johnson Lake Management Service, San Marcos, Texas. 6 p.
Longley, G. and C. Cline. 1984. Wimberley Water Quality Study. To Wimberley Citizens Group.
Dillingham, J., B. Davis, G. Longley, P. Raffeld and L. Shell. 1990. A Study of the Aquaculture Industry in Texas to Assist in Establishing Aquaculture as a Course Offering in Agricultural Science and Technology - Final Report. Project Number 00420074. Texas Education Agency and Southwest Texas State University. 29 pp.
Longley, G. and J. Maler. 1990. Preliminary Report Phase 1. San Marcos River Management Plan. EARDC R2-90. for Texas Parks and Wildlife Department and U. S. Fish and Wildlife Service.
Longley, G. 1991. Draft Report San Marcos River Management Plan. for Texas Parks and Wildlife Department.
Longley, G. and L. Gilpin. 1993. Seco Watershed Bioassessment Study TEXAS September 18, 1991 to September 1, 1993. Edwards Aquifer Research and Data Center, Southwest Texas State University, San Marcos, Texas. 67 pp.
Longley, G. and L. Gilpin. 1994. Texas Blackland Prairie and Central Texas Plateau Watershed Bioassessment Study Bell and Williamson Counties; Texas Results from October 10, 1993 to September 30, 1994. Edwards Aquifer Research and Data Center, Southwest Texas State University, San Marcos, Texas. 66 pp.
Longley, G., Gilpin, L. and G. Phillips. 1995. Texas Blackland Prairie and Central Texas Plateau Watershed Bioassessment Study - Bell and Williamson Counties; Texas Results from October 10, 1993 to September 30, 1995. Edwards Aquifer Research and Data Center, Southwest Texas State University, San Marcos, Texas. 78 pp.
Longley, G., K. Cox, G. Phillips and J. Miller. 1996. Environmental study of proposed diversion sites G-10 and G-14 on the Guadalupe River. EARDC, Southwest Texas State University. TWDB Cont. # 95-483-113. 34 p. + Appendices.
Longley, G., L. Gilpin, K. Cox and J. Burch. 1996. Biological sampling of Phillips 66 Sweeny Refinery - Linnville Bayou and Caney Creek - Matagorda County, Texas, Results of 1996 Survey. EARDC, Southwest Texas State University. Prepared for RPG Jones & Neuse. 19 p.
Longley, G. 1997. IFIM - Phase I Study Guadalupe River. EARDC. Southwest Texas State University. For Guadalupe-Blanco River Authority, Seguin, Tx. 60 p.
Longley, G., K. Cox, J. Burch and C. Thomas. 1998. Microhabitat Utilization and Fish Survey of Cibolo Creek. EARDC, Southwest Texas State University. TWDB Contract # 96-483-181. 52 P.
Longley, G., K. Cox, J. Burch and C. Thomas. 1998. Microhabitat Utilization and Fish Survey of the Guadalupe River. EARDC, Southwest Texas State University. TWDB Contract # 96-483-181. 63 P.
Longley, G., K. Cox, J. Burch and C. Thomas. 1998. Microhabitat Utilization and Fish Survey of the San Antonio River. EARDC, Southwest Texas State University. TWDB Contract # 96-483-181. 59 P.
Longley, G., J. Burch, C. Thomas and L. Gilpin. 1998. Biological Sampling of Phillips 66 Sweeny Refinery, Linnville Bayou and Caney Creek, Matagorda County, Texas. Results of 1998 Survey, EARDC, Southwest Texas State University. Prepared for RMT/Jones and Neuse. 19 p.
Longley, G., L. Gilpin, J. Burch, V. Castillo and C. Thomas. 1998. Biological Sampling of Red Draw Reservoir, Final Big Spring Refinery, Howard County, Texas. EARDC, Southwest Texas State University. Prepared for JD Consulting, LLC 11 p.
Longley, G., K. Cox and C. Thomas. 1999. Biological Sampling of Phillips 66 - Borger Refinery, Dixon Creek, White Deer Creek and Canadian River, Hutchinson Co., Texas, results of 1999 survey. Prepared for RMT, Inc. 11 p.
Longley, G. and V. Castillo III. 1999. Two-year collection/distribution plan for maintenance of captive salamanders. Final Report. EARDC. SWT. 9 p.
Castillo, V., M. Cole and G. Longley. 2000. Comparison of EPA target toxicity aquatic test organisms to the Fountain darter. EARDC Report. Southwest Texas State University. Summary. 13 p.
Longley, G., J. Guerrero and V. Castillo. 2001. Characterization of runoff from I-35 in San Marcos (Toxicity studies & Chemical-Bacteriological Analyses) Texas Department of Transportation.
Longley, G., N. Wanakule, J. Burch and M. Jennings. 2002. Edwards Aquifer Freshwater/Saline Zone Monitoring Program. Report submitted to Texas Water Development Board. Contract No. 96-483-184. 89 p.
Thomas, C, C. Williams, B. Kelley, B. Littrell and G. Longley. 2002. Electrofishing survey of Salado Creek Bell County, Texas. Report submitted to SWCA Environmental Consultants. Edwards Aquifer Research and Data Center, Southwest Texas State University. 3 p.
Longley, G. 2002. Aquatic Biology Criteria San Antonio River Improvements Project. Technical Memorandum to San Antonio River Authority. Ford Powell & Carson, Inc., HDR Engineering, Inc., Environmental Sciences of San Marcos. Proj. No. 061002. 15 p.
Longley, G., N. Wanakule, J. Burch and M. Jennings. 2002. Edwards Aquifer Freshwater/Saline Zone Monitoring Program. Report submitted to Texas Water Development Board. Contract No. 96-483-184. 89 p.
Longley, G and Texas State Study Team. 2003. Technical Report addressing issues related to issuance of a General Permit for Small Domestic Wastewater Facilities. WQD-002. Texas State University. August. Texas Commission on Environmental Quality.
Longley, G. 2004. Progress reports on Trans Pecos Spring Studies. River Systems Institute. Texas State University.
Longley, G. 2005. Progress reports on Trans Pecos Spring Studies. River Systems Institute. Texas State Unviersity.
Longley, G. 2006. Progress reports on Trans Pecos Spring Studies. River Systems Institute. Texas State University.
Slone, B., Raymond M. Slade, Jr., Rene A. Barker, and Glenn Longley. 2007. A Dynamic Graphic Procedure to Document Temporal Trends in Water Quality for National Park Service Sampling Sites, Southern Plains Network. Southern Plains Network, National Park Service.
Foster, A. and G. Longley. 2007. Occurence and fate of endocrine disruptors in the San Marcos area. Rpt. to City of San Marcos.
Courses Taught
BIO 7356: Pollution of Aquatic Ecosystems - Syllabus | Lecture Schedule | Lab Schedule
Other Links of Interest: Edwards Aquifer Research & Data Center Information
Publications
Bowman, Thomas E. and G. Longley. 1976. Redescription and assignment to the new genus Lircelous of the Texas troglobitic water slater, Asellus smithii (Ulrich)(Crustacea: Isopoda: Asellidae). Proceedings Biological Society of Washington. 88(45) :489-496.
Young, Frank N. and G. Longley. 1976. A new subterranean aquatic beetle from Texas (Coleoptera: Dytiscidae-Hydroporinae). Annals of Entomological Society of America. 69(5) :787-792.
Longley, G. and P.J. Spangler. 1977. The larva of a new subterranean water beetle, Haideoporus texanus (Coleoptera: Dytiscidae: Hydroporinae) Proceedings Biological Society of Washington. 90(3):532-535.
Longley, G. 1977. Typhlomolge (=Eurycea) rathbuni. Section contributed to publication entitled Endangered and Threatened Amphibians and Reptiles in the United States. Catalog of Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles. 6 pp.
Longley, G. 1978. Status of Typhlomolge (=Eurycea) rathbuni, the Texas Blind Salamander. Endangered Species Report No. 2, Special Publication, U.S. Fish and Wildlife Service, Albuquerque, N.M. 45 pp.
Longley, G. and H. Karnei. 1979. Status of Trogloglanis pattersoni Eigenmann, The Toothless Blindcat. Endangered Species Report 5 (Part 1), Special Publication, U.S. Fish and Wildlife Service, Albuquerque, N.M. 54 pp.
Longley, G. and H. Karnei. 1979. Status of Satan eurystomus Hubbs and Bailey, The Widemouth Blindcat. Endangered Species Report 5 (Part 2), Special Publication, U.S. Fish and Wildlife Service, Albuquerque, N.M. 48 pp.
Longley, G., R. Telfair, J. Baccus, C. Hubbs, and F. Potter (Editors) 1979. TOES Watchlist of endangered, threatened, and peripheral vertebrates of Texas. TOES, Austin, Texas. 14 pp.
Holsinger, J. and G. Longley. 1980. The subterranean amphipod crustacean fauna of an artesian well in Texas. Smithsonian Contributions to Zoology. No. 308 pp. 1-62.
Cooper, J.E. and G. Longley. 1980. Trogloglanis pattersoni Eigenmann. Page 474 in Lee, D.S. et al, eds. Atlas of North American Freshwater Fishes. North Carolina Biological Survey Pub. 1980-12.
Cooper, J.E. and G. Longley. 1980. Satan eurystomus Hubbs and Bailey. Page 473 in Lee, D.S. et al, eds. Atlas of North American Freshwater Fishes. North Carolina Biological Survey Pub. 1980-12.
Stock, J.H. and G. Longley. 1981. The generic status and distribution of Monodella texana Maguire, the only known North American Thermosbaeneacean. Proceedings Biological Society of Washington 94(2):569-578.
Longley, G. 1981. The Edwards Aquifer: Earth's most diverse groundwater ecosystem? International Journal Speleology 11(1-2):123-128.
Marek, E.A., T. Fox and G. Longley. 1981. Water, Water Conservation and the Edwards Aquifer. EUWD (San Antonio) and EARDC, Southwest Texas State University, San Marcos. 34 p.
Longley, G. 1982. La historia de la Water Pollution Control Federation. Proc. XIX Annual Meeting Soc. Mex. de Aquas, A.C. (SMAAC). Nov. 3-5. Tampico, Tamps. Mexico.
Longley, G. and B. Lukens. Ed. 1983. Proceedings Perspectives on the Edwards. Southwest Texas State University Report R2-83. 108 pp.
Hershler, R. and G. Longley. 1986. Phreatic hydrobiids (Gastropoda: Prosobranchia) from the Edwards (Balcones Fault Zone) Aquifer Region, South-Central Texas. Malacologia 27(1):127-172.
Hershler, R. and G. Longley. 1986. Hadocerus taylori, a new genus and species of phreatic Hydrobiidae (Gastropoda: Rissoacea) from South-Central Texas. Proc. Biological Society of Washington 99(1):121-136.
Longley, G. 1986. The Edwards Aquifer "Balcones Fault Zone Edwards Aquifer" and San Marcos Springs, in Physical Aspects of the Edwards Aquifer, A Field Guide. South Texas Geological Society, D-100 Petroleum Center, San Antonio, Tx. 78209. 65p.
Longley, G. 1986. The biota of the Edwards Aquifer and the implications for paleozoogeography. In Abbott, P.L. and Woodruff, C.M. Jr., eds. The Balcones Escarpment, Central Texas: Geological Society of America. pp. 51-54.
Hershler, R. and G. Longley. 1987. Phreatoceras, a new name for Hadoceras Hershler and Longley, 1986 (Gastropoda non Strand, 1934 (Cephalopoda). Proceedings of the Biological Society Wash. 100(2) p. 402.
Hershler, R. and G. Longley. 1987. Phreatodrobia coronae, a new species of cavesnail from southwestern Texas. The Nautilus 101(3):133-139.
Hammond, W. and G. Longley. 1989. On-going research. South Texas Geological Society Bulletin. 30 (4): 31-33.
Strenth, N., J. Norton and G. Longley. 1989. The larval development of the subterranean shrimp Palaemonetes antrorum Benedict (Decapoda, Palaemonidae) from Central Texas, Stygologia 4(4):363-377.
Edwards, J., G. Longley, R. Moss, J. Ward, R. Matthews, and B. Stewart. 1989. A Classification of Texas Aquatic Communities with Special Consideration Toward the Conservation of Endangered and Threatened Taxa. The Texas Journal of Science 41(3):231-240.
Strenth, N., and G. Longley. 1990. Reproductive patterns of the subterranean shrimp Palaemonetes antrorum Benedict (Decapoda, Palaemonidae) from Central Texas. Stygologia 5(4): 221-224.
Longley, G. 1991. Status and trends of the Edwards (Balcones Fault Zone) Aquifer in the San Antonio Region. Proc. of South Texas Irrigation Conference (Jan. 15). Texas Agricultural Extension Service, Texas A & M. College Station. pp. 4-18.
Longley, G. 1991. Research needs for Texas aquatic ecosystems. In Proceedings: Water for Texas - Setting the Research Agenda, Nov. 18-19, Austin, Texas Water Development Board and Texas Water Resources Institute, pp. 9-15.
Langecker,T.G. and Longley, G. 1992. Blind catfish (Trogloglanis pattersoni and Satan eurystomus) from deep artesian waters. Trends Icth.
Longley, G. 1992. The subterranean aquatic ecosystem of the Balcones Fault Zone Edwards Aquifer in Texas - Threats from over pumping. Proceedings of the First International Conference on Ground Water Ecology. April, Tampa, Fla. Amer. Water Resources Association pp. 291-300.
Langecker, T. G. and G. Longley. 1993. Morphological adaptations of the Texas blind catfishes Trogloglanis pattersoni and Satan eurystomus (Siluriformes: Ictaluridae) to their underground environment. Copeia. 93(4): 976-986.
Longley, G. 1993. The importance of the U.S. Endangered Species Act in protecting Central Texas species and ecosystems and assuring management that will provide for future good quality water for the Edwards Aquifer region. (pp. 112-123) In Hearing before the subcommittee on Environment and Natural Resources of the Committee on Merchant Marine and Fisheries House of Representatives, One Hundred Third Congress. Endangered Species Act Reauthorization - San Antonio July 6, 1993. USGPO Serial No. 103-37. 222 p.
Longley, G. 1994. The ecology and biota of the Balcones Fault Zone Edwards Aquifer in Texas. Pages 279-289 in A. R. Dutton, ed. Toxic substances and the hydrologic sciences. American Institute of Hydrology, Minneapolis, MN.
Longley, G. 1994. The ecology and biota of the Balcones Fault Zone Edwards Aquifer in Texas, in Edwards Aquifer: The Barton and San Marcos Springs Area, Field Trip Guide Book . AIH 1994 Annual Conference, Austin, Tx. April 10, 1994.
Longley, G. 1995. The relationship between long term climate change and Edwards Aquifer levels, with an emphasis on droughts and spring flows. Proc. of the 24th Water for Texas Conf.: Research Leads the Way. TWDB, TWRI, TWCA. Austin, TX. pp. 109-119.
Gilpin, L. and G. Longley. 1995. A rapid bioassessment study of Central Texas watersheds. Proc. of the 24th Water for Texas Conf.: Research Leads the Way. TWDB, TWRI, TWCA. Austin, Tx. pp. 395-404.
Longley, G. 1996. Texas Blind Salamander (In The New Handbook of Texas Vol. 6). Texas State Historical Association. P. 296.
Longley, G. 1996. Toothless Blindcat (In The New Handbook of Texas Vol. 6). Texas State Historical Association. pp. 528-529.
Longley, G. 1996. Widemouth Blindcat (In The New Handbook of Texas Vol. 6). Texas State Historical Association. P 961.
Longley, G. 1996. Edwards Aquifer. TOES News & Notes. Fall 1996.
Longley, G. and W. R. Jordan. 1996. Water resources management in the Edwards Aquifer region -- How the Endangered Species Act influenced action. Water Resources Update. Univ. Council on Water Resources, Southern Ill. Univ. 106: Winter, pp. 53-61.
Longley, G. 2003. Aquatic Ecosystem of the Edwards Aquifer in Texas. Encyclopedia of Cave and Karst Science. Fitzroy Dearborn Publishers. London. , now published by Routledge.
Longley, G. 2005. Geochemistry and other characteristics of thirty-five springs in the Trans Pecos of West Texas. Geological Society of America. Proceedings of Annual Meeting. SLC, UT
Longley, G. 2006. The Edwards Aquifer and its unique ecosystem - potential threats from groundwater management. Geological Society of America. Proceedings of Annual Meeting. Philidelphia, PA.
Theses Directed & Completed
- Lendon Gilpin. 1996. Rapid Bioassessment studies for Water Quality Determination in Central Texas.
- Grant Phillips. 1996. Water Quality of Central Texas Streams, M. S. SWT
- Janet Nelson. 1993. Population size, distribution and life history of Eurycea nana in the San Marcos River. M.S. thesis, Southwest Texas State University, San Marcos, Tx. 43 p.
- Marc Bentley. 1990. Acute and Chronic Toxicity of Three Central Texas Wastewater Treatment Plant Effluents
- William P. Rutledge. 1988. Fish Culture Production Strategy for Marine Fishes in Saltwater Rearing Ponds
- Christine M. Kolbe. 1988. The Chemical And Biological Groundwater Quality of the Sink Creek Drainage Basin, Hays County, Texas
- Sidney D. Palafox. 1987. The Effect Of A Sewage Treatment Plant Discharge On The Water Quality In Onion Creek And Williamson Creek, Travis County, Texas
- Christie A. Cline. 1984. Volatile Organohalides And Rural Drinking Water Quality -- Hays County, Texas
- David Buzan. 1979. Seasonal And Longitudinal Distribution Of The Plankton Community In A Deep-Storage Reservoir In Central Texas
- Henry Samuel Karnei, Jr. 1978. A Survey Of The Subterranean Aquatic Fauna of Bexar County, Texas
- John Jackson Ralph. 1978. The Spatial, Temporal, and Mass Balance Dynamics Of Magnesium, Sodium, and Potassium In A Deep-Storage Reservoir In Central Texas
- Michael Stahl Peters. 1977. The Mayfly Nymphs (Insecta: Ephemeroptera) Of The Guadalupe River Basin, Texas
- Travis Randell Phillips. 1977. Seasonal Succession Of Plankton In A Cooling Reservoir In Central Texas
- Thomas E. Chandler. 1976. Influence Of Rain Runoff And Wastewater Effluent On Nutrient Levels In Two Central Texas Rivers
- Billy K. Colbert. 1973. Plankton Periodicity In Two Man-Made Ponds In Central Texas
- Adam Foster. Endocrine Disruptor studies Water/Wastewater and City of San Marcos. 2007 M.S. in Chemistry.
- David Flores. Using major anions and cations to describe Trans-Pecos Springs. 2006 M. S. in Aquatic Biology.
Students & Postdoctoral Workers
Current Students:
John Eric Dedden
John Burch. Rapid Bioassessment studies on the Guadalupe, Cibolo, and San Antonio Watersheds.
Alexis (Emerson) Wolffenden. A study of the contolling factors for Salvinia molesta in two ponds.
Craig Watts
Eric Dedden
Jaimie Maher
Jeff Mitchell
Adam Foster
Stacy Foster
Virginia Fulcher
Postdocs:
Former Student Thomas Langecker (University of Hamburg) Head morphology of two species of Blind Catfish.