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Effects of environmental stressors and their interactions on zooplankton biomass and abundance in a large eutrophic lake

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dc.contributor.authorCremona, Fabien
dc.contributor.authorBlank, Kätlin
dc.contributor.authorHaberman, Juta
dc.contributor.departmentChair of Hydrobiology and Fisheryeng
dc.date.accessioned2023-03-31T07:46:07Z
dc.date.available2023-03-31T07:46:07Z
dc.date.issued2021
dc.description.abstractWe assessed long-term impacts of multi- ple stressors and their interaction on the zooplankton community of the large, eutrophic, cyanobacteria- dominated Lake Peipsi (Estonia, Russia). Stressor dataset consisted in time series (1997–2018) of temperature, nutrients, pH, water transparency, phy- toplankton biomass and taxonomic richness. The best predictors were selected with random forests machine- learning algorithms and the subsequent models were constructed with generalized linear modeling. We also aimed to identify graphical thresholds representing non-linear, marked responses of abundance or bio- mass to stressors. Temperature was the dominant stressor for explaining zooplankton abundance and biomass, followed by cyanobacteria biomass, total nitrogen concentration and water transparency. The effect of water temperature was positive, whereas the effect of cyanobacteria became negative after their biomass exceeded a threshold of * 2 mg l-1 . How- ever, the two stressors together had antagonistic effects on zooplankton, causing a decrease in biomass and abundance. For zooplankton, critical thresholds of total nitrogen (* 700 lg l-1 ), total phosphorus (* 70 lg l-1 ), and water transparency (* 1.4 m) after which zooplankton metrics changed drastically, were determined. These findings show that although lake warming alone could be positive for zooplankton, the necessity of reducing interacting stressors that influence harmful cyanobacteria growth and biomass, especially nitrogen loads, must be considered.eng
dc.description.abstractFunding was provided by Estonian Research Council PSG32.eng
dc.description.sponsorshipFunding was provided by Estonian Research Council PSG32.eng
dc.identifier.issn1573-5117
dc.identifier.publicationHydrobiologia (2021) 848:4401–4418eng
dc.identifier.urihttp://hdl.handle.net/10492/8019
dc.identifier.urihttps://dx.doi.org/10.1007/s10750-021-04653-3
dc.publisherSpringer
dc.rights© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021eng
dc.subjectzooplanktoneng
dc.subjectlarge lakeeng
dc.subjectrandom forestseng
dc.subjectcyanobacteriaeng
dc.subjecteutrophicationeng
dc.subjectstressor interactioneng
dc.subjectarticleseng
dc.titleEffects of environmental stressors and their interactions on zooplankton biomass and abundance in a large eutrophic lakeeng
dc.typeArticleeng

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