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Effects of nitrogen enrichment on zooplankton biomass and N:P recycling ratios across a DOC gradient in northern-latitude lakes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0001-5102-4289
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0001-5730-0694
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2021 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 848, no 21, p. 4991-5010Article in journal (Refereed) Published
Abstract [en]

We used data from whole-lake studies to assess how changes in food quantity (phytoplankton biomass) and quality (phytoplankton community composition, seston C:P and N:P) with N fertilization affect zooplankton biomass, community composition and C:N:P stoichiometry, and their N:P recycling ratio along a gradient in lake DOC concentrations. We found that despite major differences in phytoplankton biomass with DOC (unimodal distributions, especially with N fertilization), no major differences in zooplankton biomass were detectable. Instead, phytoplankton to zooplankton biomass ratios were high, especially at intermediate DOC and after N fertilization, implying low trophic transfer efficiencies. An explanation for the observed low phytoplankton resource use, and biomass responses in zooplankton, was dominance of colony forming chlorophytes of reduced edibility at intermediate lake DOC, combined with reduced phytoplankton mineral quality (enhanced seston N:P) with N fertilization. N fertilization, however, increased zooplankton N:P recycling ratios, with largest impact at low DOC where phytoplankton benefitted from light sufficiently to cause enhanced seston N:P. Our results suggest that although N enrichment and increased phytoplankton biomass do not necessarily increase zooplankton biomass, bottom-up effects may still impact zooplankton and their N:P recycling ratio through promotion of phytoplankton species of low edibility and altered mineral quality.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 848, no 21, p. 4991-5010
Keywords [en]
Dissolved organic carbon, Food quantity-quality, Light, Nitrogen, Pelagic food web, Phosphorus
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-187776DOI: 10.1007/s10750-021-04689-5ISI: 000695762400001Scopus ID: 2-s2.0-85114852541OAI: oai:DiVA.org:umu-187776DiVA, id: diva2:1596165
Funder
Swedish Research Council, 621-2010-4675Swedish Research Council Formas, 215-2010-922Knut and Alice Wallenberg Foundation, 2016.0083Available from: 2021-09-21 Created: 2021-09-21 Last updated: 2023-03-24Bibliographically approved

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Bergström, Ann-KristinJonsson, AndersKarlsson, Jan

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