Ocean acidification alters zooplankton communities and increases top-down pressure of a cubozoan predator

Hammill, Edd, Johnson, Ellery, Atwood, Trisha B., Harianto, Januar, Hinchliffe, Charles, Calosi, Piero ORCID: https://orcid.org/0000-0003-3378-2603 et Byrne, Maria (2018). Ocean acidification alters zooplankton communities and increases top-down pressure of a cubozoan predator. Global Change Biology, 24 (1). e128-e138.

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Résumé

The composition of local ecological communities is determined by the members of the regional community that are able to survive the abiotic and biotic conditions of a local ecosystem. Anthropogenic activities since the industrial revolution have increased atmospheric CO2 concentrations, which have in turn decreased ocean pH and altered carbonate ion concentrations: so called ocean acidification (OA). Single-species experiments have shown how OA can dramatically affect zooplankton development, physiology and skeletal mineralization status, potentially reducing their defensive function and altering their predatory and antipredatory behaviors. This means that increased OA may indirectly alter the biotic conditions by modifying trophic interactions. We investigated how OA affects the impact of a cubozoan predator on their zooplankton prey, predominantly Copepoda, Pleocyemata, Dendrobranchiata, and Amphipoda. Experimental conditions were set at either current (pCO2 370 μatm) or end-of-the-century OA (pCO2 1,100 μatm) scenarios, crossed in an orthogonal experimental design with the presence/absence of the cubozoan predator Carybdea rastoni. The combined effects of exposure to OA and predation by C. rastoni caused greater shifts in community structure, and greater reductions in the abundance of key taxa than would be predicted from combining the effect of each stressor in isolation. Specifically, we show that in the combined presence of OA and a cubozoan predator, populations of the most abundant member of the zooplankton community (calanoid copepods) were reduced 27% more than it would be predicted based on the effects of these stressors in isolation, suggesting that OA increases the susceptibility of plankton to predation. Our results indicate that the ecological consequences of OA may be greater than predicted from single-species experiments, and highlight the need to understand future marine global change from a community perspective. -- Keywords : community ecology ; copepods ; cubozoans ; gelatinous predator ; jellyfish ; Ocean Acidification ; predator–prey ; zooplankton.

Type de document :	Article
Validation par les pairs :	Oui
Information complémentaire :	Ceci est la version révisée par les pairs de l'article suivant : Hammill, E, Johnson, E, Atwood, TB, et al. Ocean acidification alters zooplankton communities and increases top-down pressure of a cubozoan predator. Glob Change Biol. 2018; 24: e128– e138. , dont la version finale est disponible ici https://doi.org/10.1111/gcb.13849. Cet article peut être utilisé sans visée commerciale, en accord avec les termes et conditions d'utilisation des articles auto-archivés de Wiley. "This is the pre-peer reviewed version of the following article: Hammill, E, Johnson, E, Atwood, TB, et al. Ocean acidification alters zooplankton communities and increases top-down pressure of a cubozoan predator. Glob Change Biol. 2018; 24: e128– e138. which has been published in final form at https://doi.org/10.1111/gcb.13849. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions."
Version du document déposé :	Post-print (version corrigée et acceptée)
Départements et unités départementales :	Département de biologie, chimie et géographie
Déposé par :	DIUQAR UQAR
Date de dépôt :	06 avr. 2023 20:15
Dernière modification :	02 oct. 2023 14:48
URI :	https://semaphore.uqar.ca/id/eprint/2210

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