Increased feeding and nutrient excretion of adult antarctic krill, Euphausia superba, exposed to enhanced carbon dioxide (CO2) ...

• Main Authors: Saba, Grace K, Schofield, Oscar, Torres, Joseph J, Ombres, Erica H, Steinberg, Deborah K
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Animalia; Antarctic; Arthropoda; Bottles or small containers/Aquaria <20 L; Euphausia superba; Growth/Morphology; Laboratory experiment; Open ocean; Other; Other metabolic rates; Pelagos; Polar; Single species; Zooplankton; Species; Time point, descriptive; Treatment; Replicate; Chlorophyll a; Carbon, inorganic, dissolved; Alkalinity, total; Temperature, water; Salinity; Phosphate; Silicate; Ammonium; Carbon, organic, dissolved; Urea; Length; Dry mass; Wet mass; Carbon, total, particulate; Nitrogen, total, particulate; Carbon, organic, particulate; Proteins; Malate dehydrogenase; Lactate dehydrogenase; Carbonate system computation flag; pH; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Experiment; Fluorometric; Coulometric titration; Potentiometric titration; Antarctic Peninsula; Antarc*; Antarctic Krill; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.833685; https://doi.pangaea.de/10.1594/PANGAEA.833685

Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO2 concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance. We assessed feeding and nutrient excretion rates in natural populations of the keystone species Euphausia superba (Antarctic krill) by conducting a CO2 perturbation experiment at ambient and elevated atmospheric CO2 levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO2 conditions (~672 ppm), ingestion rates of krill averaged 78 µg C/individual/d and were 3.5 times higher than krill ingestion rates at ambient, present day CO2 concentrations. Additionally, rates of ammonium, phosphate, and dissolved organic carbon (DOC) excretion by krill were 1.5, 1.5, and 3.0 times higher, respectively, in the high CO2 treatment than at ambient CO2 concentrations. Excretion of urea, however, was ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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). The date of carbonate chemistry calculation is 2014-07-03. ...