ORCID

Abstract

For many species, ocean acidification (OA) is having negative physiological consequences on their fitness and resilience to environmental change, but less is known about the ecosystem effects of these changes. Here, we assess how OA conditions predicted for 2100 affects the biological functioning of an important habitat-forming species Mytilus edulis and its susceptibility to predation by a key predator, the gastropod Nucella lapillus. Change in three physiological parameters in Mytilus were assessed: (1) shell thickness and cross-sectional surface area, (2) body volume and (3) feeding rate, as well as susceptibility to predation by N. lapillus. Shell thickness and cross-section area, body volume and feeding rate of Mytilus all reduced under OA conditions indicating compromised fitness. Predation risk increased by ∼26% under OA, suggesting increased susceptibility of mussels to predation and/or altered predator foraging behaviour. Notably, predation of large Mytilus – that were largely free from predation under control conditions – increased by more than 8x under OA, suggesting that body size was no longer a refuge. Our results suggest OA will impact upon ecosystem structure and functioning and the continued provision of ecosystem services associated with Mytilus reefs and the communities associated with them.

DOI

10.1016/j.marenvres.2018.05.017

Publication Date

2018-01-01

Publication Title

Marine Environmental Research

Volume

139

ISSN

0141-1136

Embargo Period

2019-05-21

Keywords

Climate change, Ecosystem engineer, Environmental change, Interaction, Predation, Trophic cascade

First Page

162

Last Page

168

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