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Inorganic carbon physiology underpins macroalgal responses to elevated CO2

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posted on 2023-05-19, 04:08 authored by Cornwall, CE, Revill, AT, Hall-Spencer, JM, Milazzo, M, Raven, JA, Catriona HurdCatriona Hurd
Beneficial effects of CO2 on photosynthetic organisms will be a key driver of ecosystem change under ocean acidification. Predicting the responses of macroalgal species to ocean acidification is complex, but we demonstrate that the response of assemblages to elevated CO2 are correlated with inorganic carbon physiology. We assessed abundance patterns and a proxy for CO2:HCO3 use (δ13C values) of macroalgae along a gradient of CO2 at a volcanic seep, and examined how shifts in species abundance at other Mediterranean seeps are related to macroalgal inorganic carbon physiology. Five macroalgal species capable of using both HCO3 and CO2 had greater CO2 use as concentrations increased. These species (and one unable to use HCO3) increased in abundance with elevated CO2 whereas obligate calcifying species, and non-calcareous macroalgae whose CO2 use did not increase consistently with concentration, declined in abundance. Physiological groupings provide a mechanistic understanding that will aid us in determining which species will benefit from ocean acidification and why.

History

Publication title

Scientific Reports

Volume

7

Article number

46297

Number

46297

Pagination

1-12

ISSN

2045-2322

Department/School

Institute for Marine and Antarctic Studies

Publisher

Nature Publishing Group

Place of publication

United Kingdom

Rights statement

Copyright 2017 The authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Ecosystem adaptation to climate change

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