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  • 1. Mooij, Wolf M.
    et al.
    van Wijk, Dianneke
    Beusen, Arthur H. W.
    Brederveld, Robert J.
    Chang, Manqi
    Cobben, Marleen M. P.
    DeAngelis, Don L.
    Downing, Andrea S.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Green, Pamela
    Gsell, Alena S.
    Huttunen, Inese
    Janse, Jan H.
    Janssen, Annette B. G.
    Hengeveld, Geerten M.
    Kong, Xiangzhen
    Kramer, Lilith
    Kuiper, Jan J.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre. Stanford University, USA.
    Langan, Simon J.
    Nolet, Bart A.
    Nuijten, Rascha J. M.
    Strokal, Maryna
    Troost, Tineke A.
    van Dam, Anne A.
    Teurlincx, Sven
    Modeling water quality in the Anthropocene: directions for the next-generation aquatic ecosystem models2019In: Current Opinion in Environmental Sustainability, ISSN 1877-3435, E-ISSN 1877-3443, Vol. 36, p. 85-95Article, review/survey (Refereed)
    Abstract [en]

    Everything changes and nothing stands still (Heraclitus). Here we review three major improvements to freshwater aquatic ecosystem models - and ecological models in general - as water quality scenario analysis tools towards a sustainable future. To tackle the rapid and deeply connected dynamics characteristic of the Anthropocene, we argue for the inclusion of eco-evolutionary, novel ecosystem and social-ecological dynamics. These dynamics arise from adaptive responses in organisms and ecosystems to global environmental change and act at different integration levels and different time scales. We provide reasons and means to incorporate each improvement into aquatic ecosystem models. Throughout this study we refer to Lake Victoria as a microcosm of the evolving novel social-ecological systems of the Anthropocene. The Lake Victoria case clearly shows how interlinked eco-evolutionary, novel ecosystem and social-ecological dynamics are, and demonstrates the need for transdisciplinary research approaches towards global sustainability.

  • 2. Teurlincx, Sven
    et al.
    Kuiper, Jan J.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Hoevenaar, Ellen C. M.
    Lurling, Miquel
    Brederveld, Robert J.
    Veraart, Annelies J.
    Janssen, Annette B. G.
    Mooij, Wolf M.
    Domis, Lisette N. de Senerpont
    Towards restoring urban waters: understanding the main pressures2019In: Current Opinion in Environmental Sustainability, ISSN 1877-3435, E-ISSN 1877-3443, Vol. 36, p. 49-58Article, review/survey (Refereed)
    Abstract [en]

    Water bodies in the urban landscape are omnipresent, with many being small, lentic waters such as ponds and lakes. Because of high anthropogenic forcing, these systems have poor water quality, with large consequences for the provisioning of ecosystem services. Understanding of the main pressures on urban water quality is key to successful management. We identify six pressures that we hypothesize to have strong links to anthropogenic forcing including: eutrophication, aquatic invasive species, altered hydrology, altered habitat structure, climate change, and micropollutants. We discuss how these pressures may affect water quality and ecological functioning of urban waters. We describe how these pressures may interact, posing challengers for water management. We identify steps that need to be taken towards sustainable restoration, recognizing the challenges that potentially interacting pressures pose to water managers.

  • 3. Teurlincx, Sven
    et al.
    van Wijk, Dianneke
    Mooij, Wolf M.
    Kuiper, Jan J.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Huttunen, Inese
    Brederveld, Robert J.
    Chang, Manqi
    Janse, Jan H.
    Woodward, Ben
    Hu, Fenjuan
    Janssen, Annette B. G.
    A perspective on water quality in connected systems: modelling feedback between upstream and downstream transport and local ecological processes2019In: Current Opinion in Environmental Sustainability, ISSN 1877-3435, E-ISSN 1877-3443, Vol. 40, p. 21-29Article in journal (Refereed)
    Abstract [en]

    Food production for a growing world population relies on application of fertilisers and pesticides on agricultural lands. However, these substances threaten surface water quality and thereby endanger valued ecosystem services such as drinking water supply, food production and recreational water use. Such deleterious effects do not merely arise on the local scale, but also on the regional scale through transport of substances as well as energy and biota across the catchment. Here we argue that aquatic ecosystem models can provide a process-based understanding of how these transports by water and organisms as vectors affect - and are affected by - ecosystem state and functioning in networks of connected lakes. Such a catchment scale approach is key to setting critical limits for the release of substances by agricultural practices and other human pressures on aquatic ecosystems. Thereby, water and food production and the trade-offs between them may be managed more sustainably.

  • 4. van Gerven, Luuk P. A.
    et al.
    Kuiper, Jan J.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre. Netherlands Inst. of Ecology (NIOO‐KNAW), the Netherlands.
    Mooij, Wolf M.
    Janse, Jan H.
    Paerl, Hans W.
    de Klein, Jeroen J. M.
    Nitrogen fixation does not axiomatically lead to phosphorus limitation in aquatic ecosystems2019In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 128, no 4, p. 563-570Article in journal (Refereed)
    Abstract [en]

    A long-standing debate in ecology deals with the role of nitrogen and phosphorus in management and restoration of aquatic ecosystems. It has been argued that nutrient reduction strategies to combat blooms of phytoplankton or floating plants should solely focus on phosphorus (P). The underlying argument is that reducing nitrogen (N) inputs is ineffective because N-2-fixing species will compensate for N deficits, thus perpetuating P limitation of primary production. A mechanistic understanding of this principle is, however, incomplete. Here, we use resource competition theory, a complex dynamic ecosystem model and a 32-year field data set on eutrophic, floating-plant dominated ecosystems to show that the growth of non-N-2-fixing species can become N limited under high P and low N inputs, even in the presence of N-2 fixing species. N-2-fixers typically require higher P concentrations than non-N-2-fixers to persist. Hence, the N-2 fixers cannot deplete the P concentration enough for the non-N-2-fixing community to become P limited because they would be outcompeted. These findings provide a testable mechanistic basis for the need to consider the reduction of both N and P inputs to most effectively restore nutrient over-enriched aquatic ecosystems.

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