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| Titel |
Effect of ocean acidification on otolith development in larvae of a tropical marine fish |
| VerfasserIn |
P. L. Munday, V. Hernaman, D. L. Dixson, S. R. Thorrold |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 6 ; Nr. 8, no. 6 (2011-06-22), S.1631-1641 |
| Datensatznummer |
250005961
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| Publikation (Nr.) |
 copernicus.org/bg-8-1631-2011.pdf |
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| Zusammenfassung |
| Calcification in many invertebrate species is predicted
to decline due to ocean acidification. The potential effects of elevated
CO2 and reduced carbonate saturation state on other species, such as
fish, are less well understood. Fish otoliths (earbones) are composed of
aragonite, and thus, might be susceptible to either the reduced availability
of carbonate ions in seawater at low pH, or to changes in extracellular
concentrations of bicarbonate and carbonate ions caused by acid-base
regulation in fish exposed to high pCO2. We reared larvae of the
clownfish Amphiprion percula from hatching to settlement at three pHNBS and pCO2
levels (control: ~pH 8.15 and 404 μatm CO2; intermediate: pH
7.8 and 1050 μatm CO2; extreme: pH 7.6 and 1721 μatm CO2)
to test the possible effects of ocean acidification on otolith development.
There was no effect of the intermediate treatment (pH 7.8 and
1050 μatm CO2) on otolith size, shape, symmetry between left and right
otoliths, or otolith elemental chemistry, compared with controls. However,
in the more extreme treatment (pH 7.6 and 1721 μatm CO2) otolith
area and maximum length were larger than controls, although no other traits
were significantly affected. Our results support the hypothesis that pH
regulation in the otolith endolymph can lead to increased precipitation of CaCO3 in
otoliths of larval fish exposed to elevated CO2, as
proposed by an earlier study, however, our results also show that
sensitivity varies considerably among species. Importantly, our results
suggest that otolith development in clownfishes is robust to even the more
pessimistic changes in ocean chemistry predicted to occur by 2100. |
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