Seawater carbonate chemistry and biological processes during experiments with spider crab Hyas araneus, 2009, supplement to: Walther, Kathleen; Sartoris, Franz-Josef; Bock, C; Pörtner, Hans-Otto (2009): Impact of anthropogenic ocean acidification on thermal tolerance of the spider crab Hyas araneus. Biogeosciences, 6(10), 2207-2215

• Main Authors: Walther, Kathleen, Sartoris, Franz-Josef, Bock, C, Pörtner, Hans-Otto
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
• Subjects: Animalia; Arthropoda; Behaviour; Benthic animals; Benthos; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Hyas araneus; Laboratory experiment; North Atlantic; Single species; Temperate; Experimental treatment; Salinity; Temperature, water; LightDark cycle; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Heart rate; Factor quantifying temperature dependent change of rates of processes; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Alkalinity, total; Aragonite saturation state; Calcite saturation state; Measured; Calculated; see references; Doppler perfusion monitor LDPM PeriFlux System 5000, Perimed AB; Calculated using seacarb after Nisumaa et al. 2010; Calculated using CO2SYS; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Helgoland; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.736931; https://doi.pangaea.de/10.1594/PANGAEA.736931

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 CO2concentration 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. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).