Tracer testing in the Edwards Aquifer

Johnson, S.E.; Schindel, Geary M.; Brahana, J.V.

doi:10.1130/2019.1215(24)

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Well LR-67-09-105 (W100-899, Hunter Road, drilled in 1970, 330 feet depth) is 0.48 miles away from the SMARC and well LR-67-09-106 (W100-900, McCarty Lane, drilled in 1970, 402 feet depth) is 1.02 miles away from the SMARC. The wells likely receive the same regional discharge that feeds Comal and San Marcos Springs with a minor influence of local recharge sources (Musgrove, 2012, Johnson et al, 2019.…”

Section: Sample Collectionmentioning

confidence: 99%

The effects of captivity on the microbiome of the endangered Comal Springs riffle beetle (Heterelmis comalensis)

Mays

Hunter

Campbell

et al. 2021

FEMS Microbiology Letters

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The gut microbiome is affected by host intrinsic factors, diet, environment, and strongly linked to host's health. Although fluctuations of microbiome composition are normal, some are due to changes in host environmental conditions. When species are moved into captive environments for conservation, education, or rehabilitation, these new conditions can influence a change in gut microbiome composition. Here, we compared the microbiomes of wild and captive Comal Springs riffle beetles (Heterelmis comalensis) by using amplicon sequencing of the 16S rRNA gene. We found that the microbiome of captive beetles was more diverse than wild beetle microbiomes. We identified 24 Amplicon Sequence Variants (ASVs) with relative abundances significantly different between the wild and captive beetles. Many of the ASVs overrepresented in captive beetle microbiomes belong to taxa linked to nitrogen-rich environments. This is one of the first studies comparing the effects of captivity on the microbiome of an endangered insect species. Our findings provide valuable information for future applications in the management of captive populations of H. comalensis.

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Section: Sample Collectionmentioning

confidence: 99%

The effects of captivity on the microbiome of the endangered Comal Springs riffle beetle (Heterelmis comalensis)

Mays

Hunter

Campbell

et al. 2021

FEMS Microbiology Letters

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“…Therefore, higher levels of ruminant fecal markers detected during wet weather could be associated with non-point sources of fecal entry into surface water bodies during storm events. However, presence of higher levels of ruminant fecal markers in groundwaters could be associated with seepage from P-1, P-2, and C-3 sites as mentioned earlier [61]. As cattle population is low in the three urban watersheds monitored, detection of BacCow markers could be due to cross-reactivity of markers to the ruminant feces [17].…”

Section: Plos Watermentioning

confidence: 81%

“…However, presence of elevated BacCan markers in groundwaters of W-2 site could be associated with leaching of dog fecal material from P-1 and C-3 sites due to closer proximity (Fig 1 ). A recent tracer tests carried at Panther Springs Creek (C-3 site) reported a groundwater velocity of 1,134 to 5,300 meters per day [61], suggesting the possibility of seepage from C-3 site to W-2 site due to proximity (<2500 meters).…”

Section: Occurrence and Concentrations Of Canine-associated Mst Markersmentioning

confidence: 99%

Precipitation impacts the physicochemical water quality and abundance of microbial source tracking markers in urban Texas watersheds

Vadde,

Moghadam,

Jafarzadeh

et al. 2024

PLOS Water

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This study investigated the sources of fecal pollution in surface and groundwaters collected from three urban watersheds in Texas during dry and wet weather and identified the impact of precipitation on water quality. Water samples (n = 316 and 107 for dry and wet events, respectively) were collected biweekly from eight sampling sites (6 sites from creeks and ponds, and 2 well sites) during two-year monitoring and analyzed for six physico-chemical parameters and ten qPCR-based assays targeting general (E. coli, Enterococcus, and universal Bacteroidales), human (BacHum and HF183), animal (Rum2Bac, BacCow, BacCan), and avian (Chicken/Duck-Bac and GFD) fecal markers. Elevated concentrations of NO3-N and NO2-N were observed in ponds and creeks sites during wet weather. Fecal markers analysis indicated higher concentrations of Rum2Bac, BacCow, and BacCan markers in most of pond and creek sites under wet weather, suggesting stormwater runoff contributed to non-point sources of fecal contamination by animal sources. Furthermore, sporadically higher concentrations of these markers were detected at groundwater sampling sites, demonstrating the significant human health risk. Multivariate statistical analysis such as cluster analysis (CA) and principal coordinate analysis (PCoA) was performed to identify relationship between sampling sites; while CA majorly classified ponds, creeks, and well sites separately, PCoA identified similarities in water quality characteristics between waters of wells with ponds and creeks. Overall, results indicate ruminant and dog fecal contamination is a major concern during storm events, consequently impacting surface and groundwater quality of the study.

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Section: Methodsmentioning

confidence: 99%

A comparison of wild and captive Comal Springs riffle beetle (Heterelmis comalensis) microbiomes

Mays¹,

Carlos‐Shanley

Campbell

et al. 2021

Preprint

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The gut microbiome is affected by host intrinsic factors, diet, environment, and strongly linked to host’s health. Although fluctuations of microbiome composition are normal, some are due to changes in host environmental conditions. When species are moved into captive environments for conservation, education, or rehabilitation, these new conditions can influence a change in gut microbiome composition. Here, we compared the microbiomes of wild and captive Comal Springs riffle beetles (Heterelmis comalensis) by using amplicon sequencing of the 16S rRNA gene. We found that the microbiome of captive beetles was more diverse than wild beetle microbiomes. We identified 24 Amplicon Sequence Variants (ASVs) with relative abundances significantly different between the wild and captive beetles. Many of the ASVs overrepresented in captive beetle microbiomes belong to taxa linked to nitrogen-rich environments. This is one of the first studies comparing the effects of captivity on the microbiome of an endangered insect species. Our findings provide valuable information for future applications in the management of captive populations of H. comalensis.

show abstract

Tracer testing in the Edwards Aquifer

Cited by 4 publications

References 7 publications

The effects of captivity on the microbiome of the endangered Comal Springs riffle beetle (Heterelmis comalensis)

The effects of captivity on the microbiome of the endangered Comal Springs riffle beetle (Heterelmis comalensis)

Precipitation impacts the physicochemical water quality and abundance of microbial source tracking markers in urban Texas watersheds

A comparison of wild and captive Comal Springs riffle beetle (Heterelmis comalensis) microbiomes

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