Competition between calcifying and noncalcifying temperate marine macroalgae under elevated CO2 levels

Hofmann, Laurie C., Straub, Sandra and Bischof, Kai (2012) Competition between calcifying and noncalcifying temperate marine macroalgae under elevated CO2 levels Marine Ecology Progress Series, 464 . pp. 89-105. DOI 10.3354/meps09892.

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Abstract

Since pre-industrial times, uptake of anthropogenic CO2 by surface ocean waters has caused a documented change of 0.1 pH units. Calcifying organisms are sensitive to elevated CO2 concentrations due to their calcium carbonate skeletons. In temperate rocky intertidal environments, calcifying and noncalcifying macroalgae make up diverse benthic photoautotrophic communities. These communities may change as calcifiers and noncalcifiers respond differently to rising CO2 concentrations. In order to test this hypothesis, we conducted an 86 d mesocosm experiment to investigate the physiological and competitive responses of calcifying and noncalcifying temperate marine macroalgae to 385, 665, and 1486 mu atm CO2. We focused on comparing 2 abundant red algae in the Northeast Atlantic: Corallina officinalis (calcifying) and Chondrus crispus (noncalcifying). We found an interactive effect of CO2 concentration and exposure time on growth rates of C. officinalis, and total protein and carbohydrate concentrations in both species. Photosynthetic rates did not show a strong response. Calcification in C. officinalis showed a parabolic response, while skeletal inorganic carbon decreased with increasing CO2. Community structure changed, as Chondrus crispus cover increased in all treatments, while C. officinalis cover decreased in both elevated-CO2 treatments. Photochemical parameters of other species are also presented. Our results suggest that CO2 will alter the competitive strengths of calcifying and noncalcifying temperate benthic macroalgae, resulting in different community structures, unless these species are able to adapt at a rate similar to or faster than the current rate of increasing sea-surface CO2 concentrations.

Document Type: Article
Additional Information: WOS:000309125500006
Keywords: Competition; Corallina officinalis; Chondrus crispus; Calcification; Ocean acidification; Mesocosm; INTER-TIDAL COMMUNITY; OCEAN ACIDIFICATION; RED ALGAE; SPECIES-DIVERSITY; INORGANIC CARBON; FOOD PREFERENCE; CORALLINE ALGAE; GRACILARIA SP; GROWTH; PHOTOSYNTHESIS
Refereed: Yes
DOI etc.: 10.3354/meps09892
ISSN: 0171-8630
Projects: BIOACID
Date Deposited: 06 Nov 2012 14:14
Last Modified: 06 Nov 2012 14:14
URI: http://oceanrep.geomar.de/id/eprint/19114

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