Abstract
Increasing pCO2 is hypothesized to induce shifts in plankton communities toward smaller cells, reduced carbon export rates and increased roles of gelatinous zooplankton. Appendicularians, among the most numerous pan-global “gelatinous” zooplankton, continuously produce filter-feeding houses, shortcutting marine food webs by ingesting submicron particles, and their discarded houses contribute significantly to carbon fluxes. We present a first mesocosm-scale study on the effects of temperature, pCO2 and bloom structures on the appendicularian, Oikopleura dioica. There were effects of temperature and nutrients on phytoplankton communities. No shifts in functional phytoplankton groups, nor changes in particle sizes/morphotypes, known to impact appendicularian feeding, were observed under manipulated pCO2 conditions. However, appendicularian abundance was positively correlated with increased pCO2, temperature and nutrient levels, consistent with hypotheses concerning gelatinous zooplankton in future oceans. This suggests appendicularians will play more important roles in marine pelagic communities and vertical carbon transport under projected ocean acidification and elevated temperature scenarios.
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Acknowledgments
The thermostat was borrowed from Ludwig-Maximilians-University Munich, Department of Biology II, D-82152 Planegg–Martinsried, Germany. Thanks to Halfdan Gjertsen, Agnes Aadnesen and Thomas Sørlie for technical and administrative assistance during the mesocosm, the staff at Appendic Park, the Sars Center for an initial stock of appendicularians, and two anonymous reviewers for comments that improved the manuscript. CT was supported by the Norwegian Research Council (NRC) project 190265/S40, JCN by the NRC project 152714/120 30 and SD from the Linnaeus Centre for Marine Evolutionary Biology at the University of Gothenburg and by a Linnaeus grant from the Swedish Research Councils VR and Formas. This project was supported by MESOAQUA (EU FP7-INFRA-2008-1, 228224), through the Transnational Access Project FUTUREWEB to CLR, AN, SD, SB, HHJ, NR, JD and AFZ and Norwegian Research Council grants NFR 133335/V40 and 204040/E40 to EMT.
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Communicated by H.-O. Pörtner.
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Troedsson, C., Bouquet, JM., Lobon, C.M. et al. Effects of ocean acidification, temperature and nutrient regimes on the appendicularian Oikopleura dioica: a mesocosm study. Mar Biol 160, 2175–2187 (2013). https://doi.org/10.1007/s00227-012-2137-9
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DOI: https://doi.org/10.1007/s00227-012-2137-9