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Direct and indirect effects of ocean acidification and warming on a marine plant-herbivore interaction

journal contribution
posted on 2023-05-21, 03:48 authored by Poore, AGB, Alexia Graba-LandryAlexia Graba-Landry, Favret, M, Brennand, HS, Byrne, M, Dworjanyn, SA

The impacts of climatic change on organisms depend on the interaction of multiple stressors and how these may affect the interactions among species. Consumer–prey relationships may be altered by changes to the abundance of either species, or by changes to the per capita interaction strength among species. To examine the effects of multiple stressors on a species interaction, we test the direct, interactive effects of ocean warming and lowered pH on an abundant marine herbivore (the amphipod Peramphithoe parmerong), and whether this herbivore is affected indirectly by these stressors altering the palatability of its algal food (Sargassum linearifolium). Both increased temperature and lowered pH independently reduced amphipod survival and growth, with the impacts of temperature outweighing those associated with reduced pH. Amphipods were further affected indirectly by changes to the palatability of their food source. The temperature and pH conditions in which algae were grown interacted to affect algal palatability, with acidified conditions only affecting feeding rates when algae were also grown at elevated temperatures. Feeding rates were largely unaffected by the conditions faced by the herbivore while feeding. These results indicate that, in addition to the direct effects on herbivore abundance, climatic stressors will affect the strength of plant–herbivore interactions by changes to the susceptibility of plant tissues to herbivory.

History

Publication title

Oecologia

Volume

173

Pagination

1113-1124

ISSN

0029-8549

Department/School

Institute for Marine and Antarctic Studies

Publisher

Springer-Verlag

Place of publication

175 Fifth Ave, New York, USA, Ny, 10010

Rights statement

Copyright Springer-Verlag Berlin Heidelberg 2013

Repository Status

  • Restricted

Socio-economic Objectives

Animal adaptation to climate change; Climate change adaptation measures (excl. ecosystem)

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