Effects of ocean acidification, temperature and nutrient regimes on the appendicularian Oikopleura dioica: a mesocosm study

Christofer Troedsson, Jean-Marie Bouquet, Carla M. Lobon, Aliona Novac, Jens C. Nejstgaard, Sam Dupont, Suncica Bosak, Hans Henrik Jakobsen, Nadezda Romanova, Lene M. Pankoke, Alejandro Isla, Jörg Dutz, Andrey F. Sazhin, Eric M. Thompson, Sam Dupont, Hans-Otto Pörtner

Research output: Contribution to journalJournal articleResearchpeer-review

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.
Original languageEnglish
JournalMarine Biology
Volume160
Issue number8
Pages (from-to)2175-2187
ISSN0025-3162
DOIs
Publication statusPublished - 2012

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