Winter in two phases: Long-term study of a shallow reservoir in winter
Date
2020
Authors
Cavaliere, Emily
Baulch, Helen
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Publisher
Wiley [Commercial Publisher], Association for the Sciences of Limnology and Oceanography (ASLO) [Society Publisher]
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Article
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Abstract
Climate-driven decreases in ice-cover duration have the potential to impact lake ecosystems, yet we have only partial understanding of the effects of winter conditions on physical, chemical, and biological properties of lakes. We used 39 years of monitoring data to examine under-ice changes in nutrients, oxygen, and phytoplankton in a shallow drinking-water reservoir. Two phases of winter were identified. Early winter was characterized by declining oxygen. In this phase, there were increases in specific conductance and concentrations of ammonium (NH4+-N) and soluble reactive phosphorus (SRP). In the month prior to ice off these trends reversed themselves and phytoplankton began to increase. Specific conductance declined as meltwater entered the lake. Nutrients (SRP and NH4+-N) declined, concurrent with increases in chlorophyll a and oxygen during late winter. This work demonstrates that chemical and biotic changes through winter are highly time dependent and differ between early and late winter phases. The late winter phase is often unstudied because of unsafe ice conditions, but here, the “spring” bloom commonly occurs in late winter under ice. The phases of winter, which are likely driven by changes in light, must be considered as we work to understand how diverse lakes will respond to declining periods of ice cover, and what drives differences in the spring ecology of diverse ice-covered lakes.
Description
This is the peer reviewed version of the following article: Cavaliere, E. & Baulch, H. Winter in two phases: Long-term study of a shallow reservoir in winter. Limnology and Oceanography. Volume 66, Issue 4. Pages 1335-1352. April 2021. https:// doi.org/10.1029/2022WR032683, which has been published in final form at 10.1029/2022WR032683. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Keywords
shallow reservoir, phytoplankton, ammonium, soluble reactive phosphorus (SRP), ice cover, spring ecology
Citation
Cavaliere, E. & Baulch, H. Winter in two phases: Long-term study of a shallow reservoir in winter. Limnology and Oceanography. Volume 66, Issue 4. Pages 1335-1352. April 2021. https:// doi.org/10.1029/2022WR032683
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Citation
Cavaliere, E. & Baulch, H. Winter in two phases: Long-term study of a shallow reservoir in winter. Limnology and Oceanography. Volume 66, Issue 4. Pages 1335-1352. April 2021. https:// doi.org/10.1029/2022WR032683
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DOI
10.1002/lno.11687