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| Titel |
Effects of ocean acidification and temperature rise on shell growth of Serripes groenlandicus |
| VerfasserIn |
Axinja Katharina Stark, Raphaela Kathöver, Olaf Heilmayer, Thomas Brey, Hans-Otto Pörtner |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046551
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| Zusammenfassung |
| The combined trends of ocean warming and acidification are expected to have significant
effects on benthic calcifying invertebrates with serious consequences for community structure
and marine ecosystem functioning. As atmospheric CO2 equilibrates with the surface ocean,
cold oceans display the highest CO2 solubility and thus, the strongest decrease in seawater
pH. Additionally, polar regions will be the first to experience an undersaturation of surface
seawaters with respect to aragonite, a calcium ion cluster used by marine molluscs to build
their shells.
From the first such study in an Arctic bivalve we report CO2 and temperature effects on
acid-base regulation and shell growth performance of the circumpolar Greenland
Smoothcockle Serripes groenlandicus from an Arctic fjord in Svalbard (79Ë N, 12Ë E). Adult
S. groenlandicus were incubated for nine weeks at three and four different CO2 levels
(control, 750, 1120 and 3000 ppm), respectively, and three different temperatures (1, 4 and 7Ë
C). Acid-base status was analysed in intra- and extracellular compartments. Shell growth and
morphology were monitored by combined light and fluorescent microscopy. Under
control CO2 treatments, shell growth was positively correlated with temperature,
but this temperature effect was compensated for by a slightly negative effect of
elevated CO2 in all treatments. Finally, shell growth and shell morphology resulted
significantly different under 3000 ppm CO2. In conclusion, S. groenlandicus is likely to
be susceptible to elevated CO2 levels owing to the CO2 induced uncompensated
extracellular acidosis, which parallels the observed disturbance of shell growth. |
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