1997
DOI: 10.1007/s002540050128
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Hydrogeologic delineation of habitats for endangered species: the Comal Springs/River System

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Cited by 13 publications
(14 citation statements)
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“…Published values based on laboratory tests suggest that growth is inhibited at velocities greater than 0.8 m/s; however, no values have been published for natural environments and it is suspected that the inhibiting velocity is much greater (Horner et al 1990). The velocity chosen is within the range of velocities suggested for gravel and cobble bed overturn by river hydraulics (Crowe and Sharp 1997). The scouring factor was increased by a factor of three to cause greater scouring of the periphyton community once the water reached scouring velocity, so as to match the patterns observed in the Bow River 2006 sampling study.…”
Section: Calibration and Validationmentioning
confidence: 95%
“…Published values based on laboratory tests suggest that growth is inhibited at velocities greater than 0.8 m/s; however, no values have been published for natural environments and it is suspected that the inhibiting velocity is much greater (Horner et al 1990). The velocity chosen is within the range of velocities suggested for gravel and cobble bed overturn by river hydraulics (Crowe and Sharp 1997). The scouring factor was increased by a factor of three to cause greater scouring of the periphyton community once the water reached scouring velocity, so as to match the patterns observed in the Bow River 2006 sampling study.…”
Section: Calibration and Validationmentioning
confidence: 95%
“…Therefore, high discharges from the springs that create faster flows could restrict T. granifera from achieving higher densities in lotic habitats where native E. comalensis achieve their highest densities. Conversely, when spring flow declines due to pumping of the underground aquifer and/or droughts that cause reduced spring flows (Bowles & Arsuffi, 1993;Crowe & Sharp, 1997), the conditions could become more lentic. Under increasingly lentic conditions, T. granifera densities could increase in the reduced flows of the spring runs, inducing stronger interactions and possible competitive exclusion of E. comalensis.…”
Section: Interactions Of Native and Exotic Snails And Their Distributmentioning
confidence: 96%
“…Hydrologic alterations to the river from both channelization and dam construction have converted much of the upper river from free-flowing lotic habitats to lentic ones. The impoundment of the headwaters of the river resulted in an 8.4 ha reservoir (Landa Lake) with four spring-runs that flow into the lake (Ogden et al, 1986;Crowe & Sharp, 1997).…”
Section: Study Sitementioning
confidence: 98%
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“…Spring-influenced lotic ecosystems often exhibit high diversity and levels of endemism, but also face anthropogenic stressors (Bowles & Arsuffi, 1993;Crowe & Sharp, 1997;Earl & Wood, 2002). Because spring-influenced ecosystems exhibit low variability in physicochemical conditions, they are particularly sensitive to the successful invasion of non-native species (Moyle & Light, 1996b).…”
Section: Introductionmentioning
confidence: 99%