Reservoir diel water quality patterns relative to riparian shade

Lake and Reservoir Management
By:  and 

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Abstract

Investigations into the effects of riparian shade on water quality have focused on streams, with less emphasis on natural lakes, and almost no attention given to reservoirs. In view of this gap, our objective was to assess diel water quality patterns in the nearshore zone of a reservoir and test whether diel patterns differed relative to the presence or absence of riparian shade. Light intensity, temperature, dissolved oxygen, pH, and oxidation-reduction potential were higher in unshaded sites (P < 0.05), whereas phosphate levels were higher in shaded sites. Levels of nitrate, turbidity, and specific conductance were similar in shaded and unshaded sites. Most variables exhibited distinct diel cycles. Light intensity in shaded and unshaded sites peaked simultaneously near mid-day, most other variables peaked several hours later in the afternoon and evening, but 1-2 h earlier in shaded sites. Unlike in streams, in most large lacustrine ecosystems the nearshore shaded band is small relative to the unshaded open water, and consequently not expected to have an extensive influence on whole-lake water quality. Nevertheless, because of the diversity of microhabitats available in nearshore areas, including those created by the effects of shade on water quality, the nearshore zone plays a disproportionate role in maintaining integrity of a lake or reservoir ecosystem. Existing guidelines inform shade management in lakes and reservoirs only indirectly and in generalities; additional research is needed to develop best management practices that address shade more comprehensively.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Reservoir diel water quality patterns relative to riparian shade
Series title Lake and Reservoir Management
DOI 10.1080/10402381.2019.1570573
Volume 35
Issue 2
Year Published 2019
Language English
Publisher Informa UK
Contributing office(s) Coop Res Unit Atlanta
Description 8 p.
First page 148
Last page 155
Country United States
State Mississippi
Other Geospatial Columbus Lake