eCite Digital Repository

Analyzing the impacts of elevated-CO2 levels on the development of a subtropical zooplankton community during oligotrophic conditions and simulated upwelling

Citation

Alguero-Muniz, M and Horn, HG and Alvarez-Fernandez, S and Spisla, C and Aberle, N and Bach, LT and Guan, W and Achterberg, EP and Riebesell, U and Boersma, M, Analyzing the impacts of elevated-CO2 levels on the development of a subtropical zooplankton community during oligotrophic conditions and simulated upwelling, Frontiers in Marine Science, 6 Article 61. ISSN 2296-7745 (2019) [Refereed Article]


Preview
PDF
5Mb
  

Copyright Statement

Copyright 2019 Alguero-Muniz, Horn, Alvarez-Fernandez, Spisla, Aberle, Bach, Guan, Achterberg, Riebesell and Boersma. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmars.2019.00061

Abstract

Ocean acidification (OA) is affecting marine ecosystems through changes in carbonate chemistry that may influence consumers of phytoplankton, often via trophic pathways. Using a mesocosm approach, we investigated OA effects on a subtropical zooplankton community during oligotrophic, bloom, and post-bloom phases under a range of different pCO2 levels (from ∼400 to ∼1480 μatm). Furthermore, we simulated an upwelling event by adding 650 m-depth nutrient-rich water to the mesocosms, which initiated a phytoplankton bloom. No effects of pCO2 on the zooplankton community were visible in the oligotrophic conditions before the bloom. The zooplankton community responded to phytoplankton bloom by increased abundances in all treatments, although the response was delayed under high-pCO2 conditions. Microzooplankton was dominated by small dinoflagellates and aloricate ciliates, which were more abundant under medium- to high-pCO2 conditions. The most abundant mesozooplankters were calanoid copepods, which did not respond to CO2 treatments during the oligotrophic phase of the experiment but were found in higher abundance under medium- and high-pCO2 conditions toward the end of the experiment, most likely as a response to increased phyto- and microzooplankton standing stocks. The second most abundant mesozooplankton taxon were appendicularians, which did not show a response to the different pCO2 treatments. Overall, CO2 effects on zooplankton seemed to be primarily transmitted through significant CO2 effects on phytoplankton and therefore indirect pathways. We conclude that elevated pCO2 can change trophic cascades with significant effects on zooplankton, what might ultimately affect higher trophic levels in the future.

Item Details

Item Type:Refereed Article
Keywords:zooplankton, ocean acidification, microzooplankton, mesozooplankton, mesocosms, ocean acidification, nutrients, Oncaea, trophic transfer efficiency
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Bach, LT (Dr Lennart Bach)
ID Code:133682
Year Published:2019
Deposited By:Ecology and Biodiversity
Deposited On:2019-07-05
Last Modified:2019-08-05
Downloads:1 View Download Statistics

Repository Staff Only: item control page