Title

Future warming and acidification result in multiple ecological impacts to a temperate coralline alga.

Document Type

Journal Article

Publication Title

Environmental microbiology

ISSN

1462-2920

Volume

20

Issue

8

First Page

2769

Last Page

2782

PubMed ID

29575500

Publisher

Blackwell Publishing Ltd

School

School of Science / Centre for Marine Ecosystems Research

Comments

Originally published as : Huggett, M. J., McMahon, K., & Bernasconi, R. (2018). Future warming and acidification result in multiple ecological impacts to a temperate coralline alga. Environmental microbiology, 20 (8), p. 2769-2782. Article can be found here

Abstract

Coralline algae are a crucial component of reef systems, stabilising reef substrate, providing habitat and contributing to accretion. Coralline algae and their surface microbial biofilms are also important as settlement cues for marine invertebrates, yet few studies address the impact of future environmental conditions on interactions between coralline algae, reef microbes and settlement by larvae of marine invertebrates. We exposed the temperate coralline algal species Amphiroa gracilis to warming and/or acidification scenarios for 21 days. Algae became bleached but photosystem II function was not measurably impacted. Settlement by larvae of the sea urchin Heliocidaris erythrogramma was reduced and the structure of the prokaryotic community associated with A. gracilis was altered. Coralline algae in ambient conditions were dominated by Alphaproteobacteria from the Rhodobacteraceae including Loktonella; those under warming were dominated by Bacteroidetes and Verrucomicrobia; acidification resulted in less Loktonella and more Planctomycetes and a combination of warming and acidification caused increases in Bacteroidetes, Verrucomicrobia and the Alphaproteobacteria family Hyphomonadaceae. These experiments indicate that predicted future environmental change may reduce the ability of some temperate reef coralline algae and associated reef microbes to facilitate settlement of invertebrate larvae as well as having a direct impact to algae via bleaching.

DOI

10.1111/1462-2920.14113

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