Energieumsatz des Zooplanktons in einer veränderten Umwelt
Biochemie und Physiologie der Tiere
Zusammenfassung der Projektergebnisse
Within the last 16 years, a next-generation of biogeochemical proxies has been established for aquatic biogeochemical and food web studies. Namely these include 1) the mean trophic position of field samples, the dominant new nitrogen source in food webs, 3) the impact of heterotrophic microbial re-synthesis on a field sample, and 4) the de novo amino acid synthesis rates during N2-fixation, the latter of which is a core result of the ZET-Change project. All proxies have in common that they significantly refined the first generation of these biogeochemical proxies and can directly address most critical parameters in marine nitrogen and carbon biogeochemical cycles. Within the ZET Change project, these proxies have been determined in data sets from four large marine ecosystems including four data sets from epipelagic and suboxic waters in the Baltic Sea from three seasons (winter, spring, summer), one data set from the outer Amazon River plume and adjacent tropical North Atlantic during high flow season, one data set from the Mekong River plume and adjacent South China Sea during a post El Niño, early South-West monsoon season, as well as one data set from the Benguela upwelling area during a winter upwelling season. While still in the process of data evaluation and publication, it is apparent already that these next-generation biogeochemical proxies were instrumental to identify highly critical and fundamentally new insights into phytoplankton and zooplankton biogeochemical functions during future scenarios of globally increasing harmful cyanobacteria blooms. The clear scientific messages of two ZET Change publications have been recognized by the L&O and Ecosphere Editors, who requested to promote the papers in their respective social networks and through press releases, which are currently prepared. Motivated by these results, I will carry this approach to the Amazon River plume during the high flow season in May 2018 and in the following years as part of a cooperation with the NSF-funded collaborative research initiative “Impact of the Amazon River Plume on nitrogen availability and planktonic food web dynamics in the Western Tropical North Atlantic” by J. P. Montoya (Georgia Institute of Technology), R. Peterson (Coastal Carolina University), and A. Subramaniam (LDEO). My part will be to identify and quantify for the first time allochthonouse and autochthonouse amino acid turnover in the presumably chemo- and heterotrophy based, brown and approved photoautotrophy-based, green food webs along the Amazon River plume. Finally, social outreach activities during the ZET Change project included my participation in the “Beste Welten”-project of the Leibniz community (see: http://www.bestewelten.de/menschen/menschen-artikel/new56fa9e2e35fec217541359-meinweg-in-die-wissenschaft/) as well as in the EU-funded Baltic gender project (see: http://www.oceanblogs.org/balticgender/2018/01/02/being-a-female-scientist-aquatic-foodweb-ecologist-natalie-loick-wilde/).
Projektbezogene Publikationen (Auswahl)
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Strategies of amino acid supply in mesozooplankton during cyanobacteria blooms: a stable nitrogen isotope approach. Ecosphere
Eglīte, E., Wodarg, D., Dutz, J., Wasmund, N., Nausch, G., Liskow, I., Schulz-Bull, D., and Natalie Loick-Wilde
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(2017). De novo amino acid synthesis and turnover during N2 fixation. Limnology and Oceanography
Loick-Wilde, N., Weber, S. C., Eglite, E., Liskow, I., Schulz-Bull, D., Wasmund, N., Wodarg, D. and Montoya, J. P.
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(2017). Microplankton biomass and diversity in the Vietnamese upwelling area during SW monsoon under normal conditions and after an ENSO event. Progress in Oceanography 153: 1-15
Loick-Wilde, N., Bombar, B., Doan, H. N., Nguyen L. N., Nguyen-Thi, A. M., Voss, M., and J. W. Dippner
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(2017). The contribution of zooplankton to methane supersaturation in the oxygenated upper waters of the central Baltic Sea. Limnology and Oceanography
Schmale, O., Wäge, J., Mohrholz, V., Wasmund, N., Gräwe, U., Rehder, G., Labrenz, M., and N. Loick-Wilde
