2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 12:15 PM - 12:30 PM | METABOLIC REGIME ALTERED BY TREATED WASTE WATER INPUTS IN AN INTERMITTENT STREAM | 310 A

METABOLIC REGIME ALTERED BY TREATED WASTE WATER INPUTS IN AN INTERMITTENT STREAM

Gross primary productivity (GPP) and ecosystem respiration (ER) are fundamental ecosystem functions strongly controlled by light, temperature, discharge, and nutrient and organic matter availability. Yet, little is known about the influence of these environmental factors on the metabolic regime of streams receiving nutrient and organic matter excesses from wastewater treatment plant (WWTP) effluents. For one year, we continuously measured light, temperature, and discharge upstream and downstream of a WWTP effluent in an intermittent headwater stream. Moreover, we seasonally measured one-week diel cycles of nutrient concentrations and daily stream metabolism (from dissolved oxygen concentrations). Light inputs were similar at the two sites, while higher temperature and nutrient concentrations coincided with higher ER rates at the downstream site. Differences in GPP between the two sites were small. Only at the downstream site, GPP and ER were strongly correlated and diel nutrient cycles emerged, though they were not clearly linked to stream metabolism. Our study highlights that WWTP effluent inputs alter natural diel cycles of nutrient concentration as well as the magnitude of ER of the receiving streams. These results can help to improve our understanding of metabolic regimes in urbanized headwaters.

Urban
Intermittent
Oxygen

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Presenters/Authors

Susana Bernal (), Center for Advanced Studies of Blanes (CEAB-CSIC), Spain, sbernal@ceab.csic.es;