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The Effect of Optical Properties on Secchi Depth and Implications for Eutrophication Management
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (EcoChange)
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2019 (English)In: Frontiers in Marine Science, E-ISSN 2296-7745, Vol. 5, p. 1-19, article id 496Article in journal (Refereed) Published
Abstract [en]

Successful management of coastal environments requires reliable monitoring methods and indicators. Besides Chlorophyll-a concentration (Chl-a), water transparency measured as Secchi Depth (ZSD) is widely used in Baltic Sea management for water quality assessment as eutrophication indicator. However, in many coastal waters not only phytoplankton but also coloured dissolved organic matter (CDOM) and suspended particulate matter (SPM) influence the under-water light field, and therefore the ZSD. In this study all three main optical variables(CDOM, Chl-a and SPM [organic and inorganic]) as well as ZSD were measured in three Swedish regions: the Bothnian Sea, the Baltic Proper and the Skagerrak in 2010-2014. Regional multiple regressions with Chl-a, CDOM and inorganic SPM as predictors explained the variations in ZSD well (R2adj = 0.53-0.84). Commonality analyses of the regressions indicated considerable differences between regions regarding the contribution of each factor to the variance, R2adj, in ZSD. CDOM explained most of the variance in the Bothnian Sea and the Skagerrak; in general, Chl-a contributed only modestly to the ZSD. In the Baltic Proper the largest contribution was from the interaction of all three variables. As expected, the link between Chl-a and ZSD was much weaker in the Bothnian Sea with high CDOM absorption and SPM concentration. When applying the Swedish EU Water Framework Directive threshold for Good/Moderate Chl-a status in the models it was shown that ZSD is neither a sufficient indicator for eutrophication, nor for changes in Chl-a. Natural coastal gradients in CDOM and SPM influence the reference conditions for ZSD and other eutrophication indicators, such as the depth distribution of macro-algae. Hence, setting targets for these indicators based on reference Chl-a concentrations and simple Chl-a to ZSD relationships might in some cases be inappropriate and misleading due to overestimation of water transparency under natural conditions.

Place, publisher, year, edition, pages
2019. Vol. 5, p. 1-19, article id 496
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:umu:diva-158247DOI: 10.3389/fmars.2018.00496Scopus ID: 2-s2.0-85059739363OAI: oai:DiVA.org:umu-158247DiVA, id: diva2:1305534
Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-04-18Bibliographically approved

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Andersson, Agneta

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Umeå Marine Sciences Centre (UMF)Department of Ecology and Environmental Sciences
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