Optimizing land management strategies for maximum improvements in lake dissolved oxygen concentrations

Crossman, J.; Futter, M.N.; Elliott, J.A.; Whitehead, P.G.; Jin, L.; Dillon, P.J.. 2019 Optimizing land management strategies for maximum improvements in lake dissolved oxygen concentrations. Science of the Total Environment, 652. 382-397. 10.1016/j.scitotenv.2018.10.160

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Official URL: https://doi.org/10.1016/j.scitotenv.2018.10.160

Abstract/Summary

Eutrophication and anoxia are unresolved issues in many large waterbodies. Globally, management success has been inconsistent, highlighting the need to identify approaches which reliably improve water quality. We used a process-based model chain to quantify effectiveness of terrestrial nutrient control measures on in-lake nitrogen, phosphorus, chlorophyll and dissolved oxygen (DO) concentrations in Lake Simcoe, Canada. Across a baseline period of 2010–2016 hydrochemical outputs from catchment models INCA-N and INCA-P were used to drive the lake model PROTECH, which simulated water quality in the three main basins of the lake. Five terrestrial nutrient control strategies were evaluated. Effectiveness differed between catchments, and water quality responses to nutrient load reductions varied between deep and shallow lake basins. Nutrient load reductions were a significant driver of increased DO concentrations, however strategies which reduced tributary inflow had a greater impact on lake restoration, associated with changes in water temperature and chemistry. Importantly, when multiple strategies were implemented simultaneously, resultant large flow reductions induced warming throughout the water column. Negative impacts of lake warming on DO overwhelmed the positive effects of nutrient reduction, and limited the effectiveness of lake restoration strategies. This study indicates that rates of lake recovery may be accelerated through a coordinated management approach, which considers strategy interactions, and the potential for temperature change-induced physical and biological feedbacks. Identified impacts of flow and temperature on rates of lake recovery have implications for management sustainability under a changing climate.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.scitotenv.2018.10.160
UKCEH and CEH Sections/Science Areas:	Water Resources (Science Area 2017-)
ISSN:	0048-9697
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	eutrophication, dissolved oxygen, phosphorus, limnology, temperature, management
NORA Subject Terms:	Ecology and Environment
Date made live:	29 Oct 2018 14:09 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/521366

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/j.scitotenv.2018.10.160

UKCEH and CEH Sections/Science Areas:

Water Resources (Science Area 2017-)

ISSN:

0048-9697

Additional Information. Not used in RCUK Gateway to Research.:

Open Access paper - full text available via Official URL link.

Additional Keywords:

eutrophication, dissolved oxygen, phosphorus, limnology, temperature, management