Water-quality assessment of Lake Houston near Houston, Texas, 2000-2004

Sneck-Fahrer, D.; Milburn, Matthew S.; East, Jeffery W.; Oden, Jeannette H.

doi:10.3133/sir20055241

Cited by 7 publications

(9 citation statements)

References 3 publications

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“…Combined urban sources (point sources and urban runoff) were the primary source contributions in this watershed and accounted for about 73% of the TN load and about 80% of the TP load delivered to the outlet of the watershed based on LMTG model output ( Table 3 ). The impact of urban sources has been well documented as to their relative importance to nutrient loadings into Galveston Bay ( Land and Shipp, 1996 ; East et al , 1998 ; Land et al , 1998 ; Sneck-Faher et al , 2005 ; see also Newell et al , 1992 ; Armstrong and Ward, 1993 ; Galveston Bay National Estuary Program, 1994 ), although percentages in other publications were typically lower than those listed here for the LMTG models. For example, point source contributions were 44% TN and 34% TP to Galveston Bay as presented in the Galveston Bay Plan of the Galveston Bay National Estuary Program (1995) while point source contributions based on LMTG model output were 60% TN and 51% TP to Galveston Bay.…”

Section: Resultsmentioning

confidence: 67%

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Rebich

Houston

Mize

et al. 2011

JAWRA Journal of the American Water Resources Association

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SPAtially Referenced Regressions On Watershed attributes (SPARROW) models were developed to estimate nutrient inputs [total nitrogen (TN) and total phosphorus (TP)] to the northwestern part of the Gulf of Mexico from streams in the South-Central United States (U.S.). This area included drainages of the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf hydrologic regions. The models were standardized to reflect nutrient sources and stream conditions during 2002. Model predictions of nutrient loads (mass per time) and yields (mass per area per time) generally were greatest in streams in the eastern part of the region and along reaches near the Texas and Louisiana shoreline. The Mississippi River and Atchafalaya River watersheds, which drain nearly two-thirds of the conterminous U.S., delivered the largest nutrient loads to the Gulf of Mexico, as expected. However, the three largest delivered TN yields were from the Trinity River/Galveston Bay, Calcasieu River, and Aransas River watersheds, while the three largest delivered TP yields were from the Calcasieu River, Mermentau River, and Trinity River/Galveston Bay watersheds. Model output indicated that the three largest sources of nitrogen from the region were atmospheric deposition (42%), commercial fertilizer (20%), and livestock manure (unconfined, 17%). The three largest sources of phosphorus were commercial fertilizer (28%), urban runoff (23%), and livestock manure (confined and unconfined, 23%).

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Section: Resultsmentioning

confidence: 67%

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Rebich

Houston

Mize

et al. 2011

JAWRA Journal of the American Water Resources Association

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“…Finally, Cypress Creek Bayou drains into an area of 495 km 2 and lies in the northern part of Houston surrounded by rural farmland [7,46]. It is a major source of drinking water and a contributor of pollutant and urban runoff into Lake Houston [7,44].…”

Section: Study Areasmentioning

confidence: 99%

Characterization of Bacterial Populations in Urban and Rural Houston Watershed Soil Samples Following a Flooding Event

Adedoyin¹,

Bhaskar²,

Rosenzweig³

2021

FEM

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Since Houston is prone to flooding events, bacterial population dynamics in Houston watershed soils pre-and post-Hurricane Harvey were evaluated. Unexpectedly, bayous closer to Houston's urban core, including Buffalo, Halls, Mustang, and Horsepen Bayous, had significantly higher enteric bacterial loads during the winter than the summer, likely due to water flow rate changes or proximity to wastewater outflow. Following bacterial load determination, isolated colonies were identified using biochemical tests. Additionally, metagenomic sequencing of 16S rDNA allowed for identification of both culturable and unculturable organisms. The phyla Proteobacteria, Actinobacteria, Bacteriodetes and Firmicutes were found to be dominant in our metagenomic analysis and are human gut bacteria. Some opportunistic bacterial Proteobacteria pathogens identified in our metabolomic analysis were Serratia marcenscens, Pseudomonas mendocina, Pseudomonas fulva, and Pseudomonas putida. To our knowledge, this is the first study that compares Houston-area bacterial populations before and after a major flooding event. Taken together, Hurricane Harvey likely contributed to a redistribution of enteric bacteria, as there was a significant increase in the enteric population of Buffalo and Halls Bayous. Similarly, our 2018 winter data set followed the same trend, as significant increases were seen in the enteric populations of Horsepen, Mustang, and Cypress Creek watershed soils.

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“…Lake Houston, a municipal water reservoir for the city of Houston, TX, was chosen for its proximity to Rice University and its relatively high organic matter content that facilitates amendment-free respiration incubations. 64 This is a preprint submitted to Earth ArXiv. This manuscript has been submitted to ACS Earth and Space Chemistry for peer review.…”

Section: Respiration Experimentsmentioning

confidence: 99%

What Fractionates Oxygen Isotopes During Respiration? Insights from Multiple Isotopologues and Theory

Ash¹,

Hu²,

Yeung³

2019

Preprint

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The precise mass dependence of respiratory O2 consumption underpins the “oxygen triple-isotope” approach to quantifying gross primary productivity in modern and ancient environments. Yet, the physical-chemical origins of the key 18O/16O and 17O/16O covariations observed during respiration have not been tied to theory; thus the approach remains empirical. First-principles calculations on enzyme active-site models suggest that changes in the O-O bond strength upon electron transfer strongly influence respiratory isotopic fractionation. However, molecular diffusion may also be important. Here, we use measurements of the relative abundances of rare isotopologues 17O18O and 18O18O as additional tracers of mass dependence during dark respiration experiments of lacustrine water. We then compare the experimental results to first-principles calculations of O2 interacting with heme-oxidase analogues. We find a significantly steeper mass dependence, supported by theory, than has been previously observed. Enrichments of 17O18O and 18O18O in the O2 residue suggest that theta values are strongly influenced by chemical processes, rather than being dominated by physical processes (i.e. by bond alteration rather than diffusion). In contrast, earlier data are inconsistent with theory, implying that analytical artifacts may have biased those results. Implications for quantifying primary productivity are discussed.

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Water-quality assessment of Lake Houston near Houston, Texas, 2000-2004

Cited by 7 publications

References 3 publications

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Characterization of Bacterial Populations in Urban and Rural Houston Watershed Soil Samples Following a Flooding Event

What Fractionates Oxygen Isotopes During Respiration? Insights from Multiple Isotopologues and Theory

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