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| Titel |
Effect of ocean acidification on the early life stages of the blue mussel Mytilus edulis |
| VerfasserIn |
F. Gazeau, J.-P. Gattuso, C. Dawber, A. E. Pronker, F. Peene, J. Peene, C. H. R. Heip, J. J. Middelburg |
| 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 ; 7, no. 7 ; Nr. 7, no. 7 (2010-07-01), S.2051-2060 |
| Datensatznummer |
250004887
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| Publikation (Nr.) |
 copernicus.org/bg-7-2051-2010.pdf |
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| Zusammenfassung |
| Several experiments have shown a decrease of growth and calcification of
organisms at decreased pH levels. There is a growing interest to focus on
early life stages that are believed to be more sensitive to environmental
disturbances such as hypercapnia. Here, we present experimental data,
acquired in a commercial hatchery, demonstrating that the growth of
planktonic mussel (Mytilus edulis) larvae is significantly affected
by a decrease of pH to a level expected for the end of the century. Even
though there was no significant effect of a 0.25–0.34 pH unit decrease on
hatching and mortality rates during the first 2 days of development nor
during the following 13-day period prior to settlement, final shells were
respectively 4.5±1.3 and 6.0±2.3% smaller at pHNBS~7.8 (pCO2~1100–1200 μatm) than at a
control pHNBS of
~8.1 (pCO2~460–640 μatm). Moreover, a decrease
of 12.0±5.4% of shell thickness was observed after 15d of development.
More severe impacts were found with a decrease of ~0.5 pHNBS
unit during the first 2 days of development which could be attributed to a
decrease of calcification due to a slight undersaturation of seawater with
respect to aragonite. Indeed, important effects on both hatching and
D-veliger shell growth were found. Hatching rates were 24±4% lower
while D-veliger shells were 12.7±0.9% smaller at pHNBS~7.6 (pCO2~1900 μatm)
than at a control pHNBS of ~8.1 (pCO2~540 μatm). Although these
results show that blue mussel larvae are still able to develop a shell in
seawater undersaturated with respect to aragonite, the observed decreases of
hatching rates and shell growth could lead to a significant decrease of the
settlement success. As the environmental conditions considered in this study
do not necessarily reflect the natural conditions experienced by this species
at the time of spawning, future studies will need to consider the whole
larval cycle (from fertilization to settlement) under environmentally
relevant conditions in order to investigate the potential ecological and
economical losses of a decrease of this species fitness in the field. |
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