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| Titel |
Impact of anthropogenic ocean acidification on thermal tolerance of the spider crab Hyas araneus |
| VerfasserIn |
K. Walther, F. J. Sartoris, C. Bock, H. O. Pörtner |
| 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 ; 6, no. 10 ; Nr. 6, no. 10 (2009-10-15), S.2207-2215 |
| Datensatznummer |
250004040
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| Publikation (Nr.) |
 copernicus.org/bg-6-2207-2009.pdf |
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| Zusammenfassung |
| Future scenarios for the oceans project combined developments of CO2
accumulation and global warming and their impact on marine ecosystems. The
synergistic impact of both factors was addressed by studying the effect of
elevated CO2 concentrations on thermal tolerance of the
cold-eurythermal spider crab Hyas araneus from the population around Helgoland. Here
ambient temperatures characterize the southernmost distribution limit of
this species. Animals were exposed to present day normocapnia (380 ppm
CO2), CO2 levels expected towards 2100 (710 ppm) and beyond (3000 ppm).
Heart rate and haemolymph PO2 (PeO2) were measured
during progressive short term cooling from 10 to 0°C and during warming
from 10 to 25°C. An increase of PeO2 occurred during
cooling, the highest values being reached at 0°C under all three
CO2 levels. Heart rate increased during warming until a critical
temperature (Tc) was reached. The putative Tc under normocapnia
was presumably >25°C, from where it fell to 23.5°C under 710 ppm
and then 21.1°C under 3000 ppm. At the same time, thermal
sensitivity, as seen in the Q10 values of heart rate, rose with
increasing CO2 concentration in the warmth. Our results suggest a
narrowing of the thermal window of Hyas araneus under moderate increases in CO2
levels by exacerbation of the heat or cold induced oxygen and capacity
limitation of thermal tolerance. |
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