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| Titel |
Physiological effects of environmental acidification in the deep-sea urchin Strongylocentrotus fragilis |
| VerfasserIn |
J. R. Taylor, C. Lovera, P. J. Whaling, K. R. Buck, E. F. Pane, J. P. Barry |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2014-03-13), S.1413-1423 |
| Datensatznummer |
250117278
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| Publikation (Nr.) |
 copernicus.org/bg-11-1413-2014.pdf |
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| Zusammenfassung |
| Anthropogenic CO2 is now reaching depths over 1000 m in the Eastern
Pacific, overlapping the Oxygen Minimum Zone (OMZ). Deep-sea animals are
suspected to be especially sensitive to environmental acidification
associated with global climate change. We have investigated the effects of
elevated pCO2 and variable O2 on the deep-sea urchin
Strongylocentrotus fragilis, a species whose range of 200–1200 m
depth includes the OMZ and spans a pCO2 range of
approx. 600–1200 μatm (approx. pH 7.6 to 7.8). Individuals were
evaluated during two exposure experiments (1-month and 4 month) at control
and three levels of elevated pCO2 at in situ O2 levels of
approx. 10% air saturation. A treatment of control pCO2 at
100% air saturation was also included in experiment two. During the
first experiment, perivisceral coelomic fluid (PCF) acid-base balance was
investigated during a one-month exposure; results show S. fragilis
has limited ability to compensate for the respiratory acidosis brought on by
elevated pCO2, due in part to low non-bicarbonate PCF buffering
capacity. During the second experiment, individuals were separated into fed
and fasted experimental groups, and longer-term effects of elevated
pCO2 and variable O2 on righting time, feeding, growth, and
gonadosomatic index (GSI) were investigated for both groups. Results suggest
that the acidosis found during experiment one does not directly correlate
with adverse effects during exposure to realistic future pCO2 levels. |
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