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Food web changes under ocean acidification promote herring larvae survival
Michael Sswat1, Martina H Stiasny1,2, Jan Taucher1
1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
Nature Ecology & Evolution
|March 21, 2018
Summary
Ocean acidification may boost survival for Atlantic herring larvae by enhancing food availability. This study highlights indirect food web effects, crucial for predicting fish populations in a high-CO2 ocean.
Area of Science:
- Marine Biology
- Oceanography
- Ecology
Background:
- Ocean acidification, driven by increased CO2, negatively impacts fish survival and recruitment.
- Previous studies focused on direct physiological effects, neglecting food web interactions.
Purpose of the Study:
- To investigate the indirect effects of ocean acidification on Atlantic herring larvae survival through food web changes.
- To assess the impact of projected end-of-century CO2 levels on a pelagic food web.
Main Methods:
- In situ mesocosm study exposing Atlantic herring larvae to elevated CO2 (~760 µatm pCO2) for 113 days.
- Analysis of plankton community dynamics and herring larvae survival rates.
Main Results:
- Herring larvae survival significantly increased by 19 ± 2% under elevated CO2 conditions.
- CO2-stimulated primary production led to increased food availability, benefiting herring larvae.
Conclusions:
- Indirect food web effects can counteract direct negative impacts of ocean acidification on fish larvae.
- Assessing food web dynamics is essential for predicting fish recruitment in future high-CO2 oceans.
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