Moen, Thomas E.

Smith, Stephen B.

English

UARK (University of Arkansas )

Journal of the Arkansas Academy of Science Volume 37 Article 41 1983 Zooplankton Population Structure in Three Reservoirs Near the Ouachita Mountain-Gulf Coastal Plain Interface Stephen B. Smith U. S. Fish and Wildlife Service Thomas E. Moen U. S. Fish and Wildlife Service Follow this and additional works at: https://scholarworks.uark.edu/jaas  Part of the Population Biology Commons, and the Terrestrial and Aquatic Ecology Commons Recommended Citation Smith, Stephen B. and Moen, Thomas E. (1983) "Zooplankton Population Structure in Three Reservoirs Near the Ouachita Mountain-Gulf Coastal Plain Interface," Journal of the Arkansas Academy of Science: Vol. 37 , Article 41. Available at: https://scholarworks.uark.edu/jaas/vol37/iss1/41 This article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able to read, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This General Note is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact scholar@uark.edu. Arkansas Academy of Science Proceedings, Vol. XXXVII,1983 99General Notesmaternity site was accomplished by sifting through guano piles and recovering skeletal and mummified remains of juvenile Tadarida during thefall of 1982.Several hundred newborn Tadarida, many with umbilicus stillattached, were observed and voucher specimens collected in June, 1983 (specimensdeposited in UALRMZ). The colony shared its maternity and hibernating quarters with approximately 500 (October estimate) big brown bats,Eptesicus fuscus. Eptesicus roosted near the apex of the attic or high up on the sloping rafters in more open areas, segregating themselves fromthe free-tails. However, inboth October, 1982 and March, 1983, several Eptesicus and Tadarida were observed roosting side by side on raftershalfway between the two colonies and during the maternity period juveniles and adults of both species often shared roosting sites. ApparentlyEptesicus has occupied these same areas of the attic during maternity periods as skeletal remains of juveniles and adults littered the manure pilesbelow. Mixed roosting of these two species inman-made structures has been reported as a common occurrence from the western states according toBarbour and Davis (Bats of America, p. 209, 1969).The third maternity site was located inthe old lion house of the Little Rock Zoo inPulaski county. The exact size of the colony was unknown,but Zoo personnel reported the accumulation of dislodged juveniles on the floor of the building as a daily occurrence during the pre-volantmaternity period. Roosting sites selected by this colony were similar to those previously described. Aportion of the colony overwintered in thebuildingas evidenced by the capture ofadult females inmist nets which had been set up to remove sparrows from the building inFebruary, 1983(pers. comm., Bob Cooper, Zoo Director).The close proximity of this colony to the University ofArkansas Medical Science campus probably explains the 1962 occurrence ofan adultfemale Tadarida captured while roosting on the latticework ofa research building(Sealander and Price, 1964).The presence of these colonies have resulted in two additional county distribution records (Faulkner and Garland), firmlyestablished thespecies as a resident mammal and extended the known northern distribution of the bat approximately 40 kilometers within the state.ACKNOWLEDGMENTSThe authors gratefully acknowledge the help of Mike McKinney, Don Floyd and John Seales of Hot Springs AnimalControl, Bob Jines, Belinda Wunderlin-Jonak, Bob Cooper, Director, Little Rock Zoo and David Westbrook, Little RockZoo. This research project was sponsored, in part, by the U.S. Forest Service (Ouachita National Forest) and a UniversityofArkansas at Little Rock Faculty Research Grant, and the UALR Office of Research, Science and Technology.KID A. SAUGEY, United States Forest Service, Hot Springs, AR 71901; DARRELL HEATH, CLARK EFAW and GARY HEIDT,rtment ofBiology, University ofArkansas-Little Rock, LittleRock, AR 72204; and TERESA E. BEGGS, DivisionofNursing, Garland Countymunity College, Hot Springs, AR 71901.ZOOPLANKTON POPULATION STRUCTURE IN THREE RESERVOIRSNEAR THE OUACHITA MOUNTAIN-GULF COASTAL PLAIN INTERFACEZooplankton are important food for young-of-the-year and certain adult fish and may serve as an indicator of trophic status (McNaught,Verh, int. Ver. Limnol. 19:724-731, 1975). In1979, the National Reservoir Research Program and the Waterways Experiment Station of the U.S.ArmyCorps ofEngineers conducted a cooperative study of the effects ofreservoir operations on tailwater environments. The study included seasonalmeasurements of water quality and zooplankton populations in three reservoirs (Pine Creek Lake, Oklahoma; and Gillham and Greeson Lakes,tThelakes are in different river drainages near the interface of the Ouachita Mountains and the Gulf Coastal Plain physiographic provinces.Creek and Gillham Lakes are multi-purpose, flood control impoundments in the Little River system. Pine Creek Lake (2,023 ha) is a mainstemfoir on the Little River in southeast Oklahoma; Gillham Lake (554 ha) impounds the Cossatot River in southwest Arkansas; and Lake Greeson0ha), is a Corps ofEngineers hydroelectric project on the LittleMissouri River in the Ouachita River basin in west central Arkansas. Selectedcochemical characteristics of the three lakes include low conductivity (34-52 umhos/cm), low alkalinity (6-13 mg/1 as CaCOj), and nearlyal pH (ca. 6.5).tin1979, zooplankton densities were estimated for Pine Creek Lake from April through November, for Gillham Lake from June throughber, and for Lake Greeson from May through October. Vertical tows at depths of 15-10 m, 10-5 m, and 5-0 m were made with an 0.08-mm,0.3-m closing net. Samples were immediately preserved in3% formalin. Two 1-ml subsamples were later placed in a Sedgwick-Rafterting cell where all organisms were identified and counted. Dry weight biomass estimates (from the upper stratum) were calculated byregressionlions (Dumont et al., Oecologie 19:75-97, 1975). Cladocera and Rotifera (except Conochilidae) were identified to species, and Copepoda wereified to suborder. Allestimates were expanded to number and milligrams per cubic meter.tDaphniarosea, D.catawba, Leydigia quadrangularis, and Synchaeta sp. were found only in Gillham Lake, where a total of 12 species of•cerans and 17 species ofrotifers were collected. Daphnia galeata mendotae and Keratella americana were collected only in Lake Greeson,e 9cladoceran and 17 rotifer species were identified. Nine cladoceran and 18 rotifer species were found inPine Creek Lake. Copepoda rankedin density throughout the study period (Table); however, comparisons of the copepod suborders (Calanoida and Cyclopoida) to the cladoceranotifer genera were not considered valid, and relationships were not analyzed. Chaoborus appeared in zooplankton collections from all threevoirs.» Zooplankton densities in the upper stratum of Pine Creek Lake peaked in spring and early summer (Figure). Conochilidae were the mostidant zooplankters throughout the sampling period (Table), and composed over 50% of the population during Apriland July. However, Daphniaula (23%) and Holopedium amazonicum (29%) were responsible for the greatest biomass in Apriland July, respectively.§Population densities of rotifers, copepods, and cladocerans peaked in the upper stratum of Gillham Lake simultaneously in July. Thelations progressively decreased through the fall. Conochilidae and Kellicottia bostoniensis were the most abundant zooplankters (Table).oedium amazonicum composed the greatest mean biomass, although itdominated the biomass (65%) onlyin June. Hexarthra mira,Ceriodaphniaand Daphnia ambigua and D. Laevis contributed the greatest biomass in July, September, and October, respectively.¦ In Lake Greeson, the copepods peaked in May, rotifers in July, and cladocerans in September. Total zooplankton densities were highestbiomass lowest in the upper stratum during July (Figure), when Collotheca sp. made up 90% of the total density and 44% of the total biomass.99Journal of the Arkansas Academy of Science, Vol. 37 [1983], Art. 41Published by Arkansas Academy of Science, 1983100 Arkansas Academy of Science Proceedings, Vol. XXXVII,1983Arkansas Academy of ScienceTable. Order of abundance of zooplankton ranked from 1-20, 1-21,and 1-19 respectively, from the upper strata (0-5 m) inPine Creek Lake,Oklahoma, and Gillham and Greeson Lakes, Arkansas, 1979.CladoceraBosmina longirostris (O.F. Muller) 9 5 4Cerlodaphnia spp. 16 8 18Chydorus sphaerlcus (O.F. Muller) 20 21Daphnia ambijjua Scourfield 13 14 13I), catawba Coker 14D. galeata mendotae BIrge 15D. laevls Birgel 17 17D. parvula Fordyce 8 16 17Diaphanosoma leuchtenberfiianum Fisher 10 8Holopedlum amazonicum Stingelin 14 12 16CopepodaCalanoida + + +Cyclopoida + + +Nauplii + + +RociferaAsplanchna priodonta Gosse 10 13 6Branchlonus sp. 15 18Collotheca sp. 116 1Conochllidae 12Fillnia longiseta Ehrenbers 18 20Gastropus styllfer Imhol 5 19 12Hexarthra mlra (Hudson) 6 4 9Kellicottis boston lens is Rousselet 2 2 11Karatella spp. 3 3 4Platylas quadricornls (Ehrenberg) 21Ploesoma sp. 20 11 19Polyarthra euryptera (Wlerzejskl) 4 7 3Trlchocerca cyllndrlea (Imhof) 12 8 7T. capucina (Wierzejski et Zach.) 18 15 10'Not verified+ - Abundant but not rankedAPR MAY JUN JUL AUG SEP OCT NOVFigure. Total zooplankton abundance and dry weight biomass fromthe upper stratum (0-5m) inPine Creek Lake, Oklahoma, and Gillhamand Greeson Lakes, Arkansas, 1979.Food availability, as a function ofparticle size, appeared to regulate the zooplankton community structure in Pine Creek and Gillham Lakes.These reservoirs, from the western sections of the Ouachita Mountains, contain higher amounts oftotal organic carbon due to greater amountsof allochtonous materials, possibly from land use and soil types (J. Nix, Ouachita Baptist University, personal communication). Furthermore,zooplankton species composition was more closely related and population abundance and biomass estimates were higher inPine Creek and GillhamLakes than inLake Greeson. However, fluctuations in zooplankton abundance were similar in Gillham and Greeson lakes, even though changesin the rotifer populations resulted in an inverse relationship of the biomass estimates between the two reservoirs (Figure). Lake Greeson, the leasteutrophic of the three lakes, had cladoceran populations that were indicative ofcommunities found at low nutrient concentrations, where accordingto Porter (Amer. Sci. 65:159-170, 1977), small species or species with high surface to volume ratios may be abundant.STEPHEN B. SMITH'and THOMAS E. MOEN, U. S. Fish and Wildlife Service, Multi-Outlet Reservoir Studies, Arkadelpttia, AR 71923.'Present address: Great Lakes Fishery Laboratory, Ann Arbor,MI48105. Contribution 597, Great Lakes Fishery Laboratory, U.S. Fish andWildlife Service.NEW COUNTY AND STATE RECORDS OFMOSSES FROM ARKANSASBryophytes have been collected in Arkansas by only a few individuals. Although much is known about the distribution of bryophytes inthe Ozark region of Arkansas (Wittlake, 1950b; Redfearn, 1964, 1966, 1968, 1970, 1972, 1979), little information is available for other regionsof the state (Lowe, 1919; Scully, 1941; Moore, 1964). Wittlake (1950a) reviewed the early work concerning bryophytes of Arkansas. This paperreports new county and state records of bryophytes from Arkansas.Most of the new county records are from collections stored at the University of Arkansas, Fayetteville, and were made by E. B. Wittlakebetween 1948 and 1951. These collections are currently being processed into modern storage facilities.As a result ofspecimens processed thus far, 28 new county records are represented in Wittlake's (EBW) collection. Collections made by thesecond author (JEM) at Hot Springs National Park, Garland County represented five additional county records. Voucher specimens have beendeposited at the University ofCentral Arkansas herbarium. Finally, three county records are from collections made by the senior author (SLT)and have been deposited at the University of Arkansas, Fayetteville herbarium.100Journal of the Arkansas Academy of Science, Vol. 37 [1983], Art. 41https://scholarworks.uark.edu/jaas/vol37/iss1/41

Zooplankton Population Structure in Three Reservoirs Near the Ouachita Mountain-Gulf Coastal Plain Interface

ScholarWorks@UARK

Journal of the Arkansas Academy of ScienceVolume 37 Article 411983Zooplankton Population Structure in ThreeReservoirs Near the Ouachita Mountain-GulfCoastal Plain InterfaceStephen B. SmithU. S. Fish and Wildlife ServiceThomas E. MoenU. S. Fish and Wildlife ServiceFollow this and additional works at: http://scholarworks.uark.edu/jaasPart of the Population Biology Commons, and the Terrestrial and Aquatic Ecology CommonsThis article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able toread, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking priorpermission from the publisher or the author.This General Note is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the ArkansasAcademy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact scholar@uark.edu, ccmiddle@uark.edu.Recommended CitationSmith, Stephen B. and Moen, Thomas E. (1983) "Zooplankton Population Structure in Three Reservoirs Near the OuachitaMountain-Gulf Coastal Plain Interface," Journal of the Arkansas Academy of Science: Vol. 37 , Article 41.Available at: http://scholarworks.uark.edu/jaas/vol37/iss1/41Arkansas Academy of Science Proceedings, Vol. XXXVII,1983 99General Notesmaternity site was accomplished by sifting through guano piles and recovering skeletal and mummified remains of juvenile Tadarida during thefall of 1982.Several hundred newborn Tadarida, many with umbilicus stillattached, were observed and voucher specimens collected in June, 1983 (specimensdeposited in UALRMZ). The colony shared its maternity and hibernating quarters with approximately 500 (October estimate) big brown bats,Eptesicus fuscus. Eptesicus roosted near the apex of the attic or high up on the sloping rafters in more open areas, segregating themselves fromthe free-tails. However, inboth October, 1982 and March, 1983, several Eptesicus and Tadarida were observed roosting side by side on raftershalfway between the two colonies and during the maternity period juveniles and adults of both species often shared roosting sites. ApparentlyEptesicus has occupied these same areas of the attic during maternity periods as skeletal remains of juveniles and adults littered the manure pilesbelow. Mixed roosting of these two species inman-made structures has been reported as a common occurrence from the western states according toBarbour and Davis (Bats of America, p. 209, 1969).The third maternity site was located inthe old lion house of the Little Rock Zoo inPulaski county. The exact size of the colony was unknown,but Zoo personnel reported the accumulation of dislodged juveniles on the floor of the building as a daily occurrence during the pre-volantmaternity period. Roosting sites selected by this colony were similar to those previously described. Aportion of the colony overwintered in thebuildingas evidenced by the capture ofadult females inmist nets which had been set up to remove sparrows from the building inFebruary, 1983(pers. comm., Bob Cooper, Zoo Director).The close proximity of this colony to the University ofArkansas Medical Science campus probably explains the 1962 occurrence ofan adultfemale Tadarida captured while roosting on the latticework ofa research building(Sealander and Price, 1964).The presence of these colonies have resulted in two additional county distribution records (Faulkner and Garland), firmlyestablished thespecies as a resident mammal and extended the known northern distribution of the bat approximately 40 kilometers within the state.ACKNOWLEDGMENTSThe authors gratefully acknowledge the help of Mike McKinney, Don Floyd and John Seales of Hot Springs AnimalControl, Bob Jines, Belinda Wunderlin-Jonak, Bob Cooper, Director, Little Rock Zoo and David Westbrook, Little RockZoo. This research project was sponsored, in part, by the U.S. Forest Service (Ouachita National Forest) and a UniversityofArkansas at Little Rock Faculty Research Grant, and the UALR Office of Research, Science and Technology.KID A. SAUGEY, United States Forest Service, Hot Springs, AR 71901; DARRELL HEATH, CLARK EFAW and GARY HEIDT,rtment ofBiology, University ofArkansas-Little Rock, LittleRock, AR 72204; and TERESA E. BEGGS, DivisionofNursing, Garland Countymunity College, Hot Springs, AR 71901.ZOOPLANKTON POPULATION STRUCTURE IN THREE RESERVOIRSNEAR THE OUACHITA MOUNTAIN- GULF COASTAL PLAIN INTERFACEZooplankton are important food for young-of-the-year and certain adult fish and may serve as an indicator of trophic status (McNaught,Verh, int. Ver. Limnol. 19:724-731, 1975). In1979, the National Reservoir Research Program and the Waterways Experiment Station of the U.S.ArmyCorps ofEngineers conducted a cooperative study of the effects ofreservoir operations on tailwater environments. The study included seasonalmeasurements of water quality and zooplankton populations in three reservoirs (Pine Creek Lake, Oklahoma; and Gillham and Greeson Lakes,tThe lakes are in different river drainages near the interface of the Ouachita Mountains and the Gulf Coastal Plain physiographic provinces.Creek and Gillham Lakes are multi-purpose, flood control impoundments in the Little River system. Pine Creek Lake (2,023 ha) is a mainstemfoir on the Little River in southeast Oklahoma; Gillham Lake (554 ha) impounds the Cossatot River in southwest Arkansas; and Lake Greeson0ha), is a Corps ofEngineers hydroelectric project on the LittleMissouri River in the Ouachita River basin in west central Arkansas. Selectedcochemical characteristics of the three lakes include low conductivity (34-52 umhos/cm), low alkalinity (6-13 mg/1 as CaCOj), and nearlyal pH (ca. 6.5).tin 1979, zooplankton densities were estimated for Pine Creek Lake from April through November, for Gillham Lake from June throughber, and for Lake Greeson from May through October. Vertical tows at depths of 15-10 m, 10-5 m, and 5-0 m were made with an 0.08-mm,0.3-m closing net. Samples were immediately preserved in3% formalin. Two 1-ml subsamples were later placed in a Sedgwick-Rafterting cell where all organisms were identified and counted. Dry weight biomass estimates (from the upper stratum) were calculated byregressionlions (Dumont et al., Oecologie 19:75-97, 1975). Cladocera and Rotifera (except Conochilidae) were identified to species, and Copepoda wereified to suborder. Allestimates were expanded to number and milligrams per cubic meter.tDaphnia rosea, D.catawba, Leydigia quadrangularis, and Synchaeta sp. were found only in Gillham Lake, where a total of 12 species of•cerans and 17 species ofrotifers were collected. Daphnia galeata mendotae and Keratella americana were collected only in Lake Greeson,e 9cladoceran and 17 rotifer species were identified. Nine cladoceran and 18 rotifer species were found inPine Creek Lake. Copepoda rankedin density throughout the study period (Table); however, comparisons of the copepod suborders (Calanoida and Cyclopoida) to the cladoceranotifer genera were not considered valid, and relationships were not analyzed. Chaoborus appeared in zooplankton collections from all threevoirs.» Zooplankton densities in the upper stratum of Pine Creek Lake peaked in spring and early summer (Figure). Conochilidae were the mostidant zooplankters throughout the sampling period (Table), and composed over 50% of the population during Apriland July. However, Daphniaula (23%) and Holopedium amazonicum (29%) were responsible for the greatest biomass in Apriland July, respectively.§Population densities of rotifers, copepods, and cladocerans peaked in the upper stratum of Gillham Lake simultaneously in July. Thelations progressively decreased through the fall. Conochilidae and Kellicottia bostoniensis were the most abundant zooplankters (Table).oedium amazonicum composed the greatest mean biomass, although itdominated the biomass (65%) onlyin June. Hexarthra mira,Ceriodaphniaand Daphnia ambigua and D. Laevis contributed the greatest biomass in July, September, and October, respectively.¦ In Lake Greeson, the copepods peaked in May, rotifers in July, and cladocerans in September. Total zooplankton densities were highestbiomass lowest in the upper stratum during July (Figure), when Collotheca sp. made up 90% of the total density and 44% of the total biomass.99Journal of the Arkansas Academy of Science, Vol. 37 [1983], Art. 41Published by Arkansas Academy of Science, 1983100 Arkansas Academy of Science Proceedings, Vol. XXXVII,1983Arkansas Academy of ScienceTable. Order of abundance of zooplankton ranked from 1-20, 1-21,and 1-19 respectively, from the upper strata (0-5 m) inPine Creek Lake,Oklahoma, and Gillham and Greeson Lakes, Arkansas, 1979.CladoceraBosmina longirostris (O.F. Muller) 9 5 4Cerlodaphnia spp. 16 8 18Chydorus sphaerlcus (O.F. Muller) 20 21Daphnia ambijjua Scourfield 13 14 13I), catawba Coker 14D. galeata mendotae BIrge 15D. laevls Birgel 17 17D. parvula Fordyce 8 16 17Diaphanosoma leuchtenberfiianum Fisher 10 8Holopedlum amazonicum Stingelin 14 12 16CopepodaCalanoida + + +Cyclopoida + + +Nauplii + + +RociferaAsplanchna priodonta Gosse 10 13 6Branchlonus sp. 15 18Collotheca sp. 116 1Conochllidae 12Fillnia longiseta Ehrenbers 18 20Gastropus styllfer Imhol 5 19 12Hexarthra mlra (Hudson) 6 4 9Kellicottis boston lens is Rousselet 2 2 11Karatella spp. 3 3 4Platylas quadricornls (Ehrenberg) 21Ploesoma sp. 20 11 19Polyarthra euryptera (Wlerzejskl) 4 7 3Trlchocerca cyllndrlea (Imhof) 12 8 7T. capucina (Wierzejski et Zach.) 18 15 10'Not verified+ - Abundant but not rankedAPR MAY JUN JUL AUG SEP OCT NOVFigure. Total zooplankton abundance and dry weight biomass fromthe upper stratum (0-5m) inPine Creek Lake, Oklahoma, and Gillhamand Greeson Lakes, Arkansas, 1979.Food availability, as a function ofparticle size, appeared to regulate the zooplankton community structure in Pine Creek and Gillham Lakes.These reservoirs, from the western sections of the Ouachita Mountains, contain higher amounts oftotal organic carbon due to greater amountsof allochtonous materials, possibly from land use and soil types (J. Nix, Ouachita Baptist University, personal communication). Furthermore,zooplankton species composition was more closely related and population abundance and biomass estimates were higher inPine Creek and GillhamLakes than inLake Greeson. However, fluctuations in zooplankton abundance were similar in Gillham and Greeson lakes, even though changesin the rotifer populations resulted in an inverse relationship of the biomass estimates between the two reservoirs (Figure). Lake Greeson, the leasteutrophic of the three lakes, had cladoceran populations that were indicative ofcommunities found at low nutrient concentrations, where accordingto Porter (Amer. Sci. 65:159-170, 1977), small species or species with high surface to volume ratios may be abundant.STEPHEN B. SMITH'and THOMAS E. MOEN, U. S. Fish and Wildlife Service, Multi-Outlet Reservoir Studies, Arkadelpttia, AR 71923.'Present address: Great Lakes Fishery Laboratory, Ann Arbor,MI48105. Contribution 597, Great Lakes Fishery Laboratory, U.S. Fish andWildlife Service.NEW COUNTY AND STATE RECORDS OFMOSSES FROM ARKANSASBryophytes have been collected in Arkansas by only a few individuals. Although much is known about the distribution of bryophytes inthe Ozark region of Arkansas (Wittlake, 1950b; Redfearn, 1964, 1966, 1968, 1970, 1972, 1979), little information is available for other regionsof the state (Lowe, 1919; Scully, 1941; Moore, 1964). Wittlake (1950a) reviewed the early work concerning bryophytes of Arkansas. This paperreports new county and state records of bryophytes from Arkansas.Most of the new county records are from collections stored at the University of Arkansas, Fayetteville, and were made by E. B. Wittlakebetween 1948 and 1951. These collections are currently being processed into modern storage facilities.As a result ofspecimens processed thus far, 28 new county records are represented in Wittlake's (EBW) collection. Collections made by thesecond author (JEM) at Hot Springs National Park, Garland County represented five additional county records. Voucher specimens have beendeposited at the University ofCentral Arkansas herbarium. Finally, three county records are from collections made by the senior author (SLT)and have been deposited at the University of Arkansas, Fayetteville herbarium.100Journal of the Arkansas Academy of Science, Vol. 37 [1983], Art. 41http://scholarworks.uark.edu/jaas/vol37/iss1/41

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Zooplankton Population Structure in Three Reservoirs Near the Ouachita Mountain-Gulf Coastal Plain Interface

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