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Investigating the causes of reduced dissolved oxygen concentrations in Kickapoo Creek, TX

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Abstract

Excessive organic matter and nutrients can depress dissolved oxygen concentration (DOC) in streams. The aim of this study was to understand the depressed DOC of Kickapoo Creek in Texas, USA, which is an impaired stream; identify the possible sources causing the depressed DOC and elevated Escherichia coli levels; and identify possible remedial measures. Monthly grab water quality data was monitored for nine stations in the watershed. For three of the nine stations, 24-h DOC was also monitored for a comparison with the minimum and average DOC criteria. Correlational, graphical, spatial, and temporal analyses were carried out for DOC concentration with other water quality variables which have the potential to depress DOC in the stream. The correlational analyses show a weak to moderate correlation for DOC with nutrient and oxygen-demanding substance concentrations present in the stream. However, there are spatial and temporal trends in DOC data that can be attributed to the nutrient influx into the stream. A pattern of increasing nutrient concentrations from upstream to downstream partially explains the decreasing dissolved oxygen (DO) concentrations observed towards the lower reaches. Visual interpretations of riparian vegetation and sediment influx also support the spatial patterns in DO concentrations. The majority of the depressed DOC occurs in the summer months when streamflow is at a minimum. The depressed DOC during summer is partially explained by the increasing daily temperatures for the summer months as revealed by the trend analysis of the daily temperature data from 1981 to 2020 using the modified Mann–Kendall test, Pettitt test, and Sen’s slope.

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Data used in the study is available on request.

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Acknowledgements

The authors thank Texas Institute for Applied Environmental Research (TIAER) for the water quality data collection and lab analysis, Angelina Neches River Authority (ANRA) for analyzing bacteria in the water samples, and Texas State Soil and Water Conservation Board (TSSWCB) for funding the study.

Funding

This study is funded by the Texas State Soil and Water Conservation Board (TSSWCB), USA.

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Contributions

Narayanan Kannan conceptualized the technical part of the study, carried out the depressed dissolved oxygen and bacteria analysis, and wrote a significant portion of the manuscript. Kartik Venkataraman carried out the climate change analysis, related that with the depressed dissolved oxygen issue, and wrote an appreciable portion of the manuscript, Jeff Strobel collected field observations and Leah Taylor obtained the funding and managed the project.

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Correspondence to Narayanan Kannan.

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Highlights

• Dissolved oxygen concentration (DOC) data of Kickapoo Creek in Texas, USA, was analyzed.

• Analyses found other water quality parameters, with the potential for affecting DOC, helped explain observed DOC patterns.

• Declining dissolved oxygen (DO) concentrations were observed from upstream to downstream and during the summer months.

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Kannan, N., Venkataraman, K., Stroebel, J. et al. Investigating the causes of reduced dissolved oxygen concentrations in Kickapoo Creek, TX. Environ Monit Assess 194, 574 (2022). https://doi.org/10.1007/s10661-022-10209-2

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  • DOI: https://doi.org/10.1007/s10661-022-10209-2

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