Calcifying invertebrates succeed in a naturally CO2 enriched coastal habitat but are threatened by high levels of future acidification

Thomsen, Jörn, Gutowska, Magdalena, Saphörster, Julia, Heinemann, Agnes, Trübenbach, Katja, Fietzke, Jan, Hiebenthal, Claas, Eisenhauer, Anton, Körtzinger, Arne, Wahl, Martin and Melzner, Frank (2010) Calcifying invertebrates succeed in a naturally CO2 enriched coastal habitat but are threatened by high levels of future acidification Biogeosciences (BG), 7 (11). pp. 3879-3891. DOI 10.5194/bg-7-3879-2010.

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Abstract

CO2 emissions are leading to an acidification of the oceans. Predicting marine community vulnerability towards acidification is difficult, as adaptation processes cannot be accounted for in most experimental studies. Naturally CO2 enriched sites thus can serve as valuable proxies for future changes in community structure. Here we describe a natural analogue site in the Western Baltic Sea. Seawater pCO2 in Kiel Fjord is elevated for large parts of the year due to upwelling of CO2 rich waters. Peak pCO2 values of >230 Pa (>2300 μatm) and pHNBS values of <7.5 are encountered during summer and autumn, average pCO2 values are ~70 Pa (~700 μatm). In contrast to previously described naturally CO2 enriched sites that have suggested a progressive displacement of calcifying auto- and heterotrophic species, the macrobenthic community in Kiel Fjord is dominated by calcifying invertebrates. We show that blue mussels from Kiel Fjord can maintain control rates of somatic and shell growth at a pCO2 of 142 Pa (1400 μatm, pHNBS = 7.7). Juvenile mussel recruitment peaks during the summer months, when high water pCO2 values of ~100 Pa (~1000 μatm) prevail. Our findings indicate that calcifying keystone species may be able to cope with surface ocean pHNBS values projected for the end of this century when food supply is sufficient. However, owing to non-linear synergistic effects of future acidification and upwelling of corrosive water, peak seawater pCO2 in Kiel Fjord and many other productive estuarine habitats could increase to values >400 Pa (>4000 μatm). These changes will most likely affect calcification and recruitment, and increase external shell dissolution.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/211384
Additional Information: WOS:000284756300031
Keywords: Oceanography; Marine Biology; Chemistry; ocean acidification; invertebrates; marine ecology; ACID-BASE-BALANCE; CO2-DRIVEN OCEAN ACIDIFICATION; MYTILUS-EDULIS; CARBONIC-ACID; DISSOCIATION-CONSTANTS; EXTRAPALLIAL FLUID; BLUE MUSSELS; SEA MUSSEL; SEAWATER; WATER
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University > Faculty of Medicine > Institute of Physiology
Refereed: Yes
DOI etc.: 10.5194/bg-7-3879-2010
ISSN: 1726-4170
Projects: BIOACID, EPOCA, Future Ocean
Date Deposited: 29 Nov 2010 13:10
Last Modified: 23 Jan 2013 10:05
URI: http://oceanrep.geomar.de/id/eprint/10214

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