2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 2:00 PM - 3:30 PM | ORGANIC MATTER QUANTITY AND QUALITY FROM LOTIC TO LENTIC ALONG A RESERVOIR CONTINUUM | Virtual Platform

ORGANIC MATTER QUANTITY AND QUALITY FROM LOTIC TO LENTIC ALONG A RESERVOIR CONTINUUM

While there is increasing recognition of the role reservoirs play in altering biogeochemical cycling along the river continuum, there is still uncertainty around how organic matter processing changes from stream inflows to reservoir outflows. To address this, we measured organic matter quantity and quality along a reservoir continuum from stream inflow to reservoir outflow throughout a summer season. We measured organic matter quantity via dissolved organic carbon concentrations ([DOC]) and dissolved organic matter (DOM) quality using absorbance and fluorescence based-metrics from March to November 2019 at seven sites in a small eutrophic, drinking water reservoir located in southwest Virginia, USA. We observed similar [DOC] and humic, allochthonous-like DOM quality at all sites in spring and early summer followed by increasing [DOC] at the in-reservoir sites and increasing autochthonous, microbial-like DOM. This was accompanied by increasing chlorophyll-a concentrations, indicative of phytoplankton production throughout the reservoir. Clear differences in lotic versus lentic sites demonstrate notable changes in DOM quantity and quality along the reservoir continuum. Results have important implications for our understanding of carbon cycling across aquatic ecosystems and highlights the important role of reservoirs in carbon processing along the river continuum.

Carbon cycle
Organic matter
Connectivity

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Presenters/Authors

Alexandria Hounshell (), Virginia Tech, alexgh@vt.edu;