Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2016
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| _version_ | 1867170071649976320 |
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| author | Schram, Julie B Schoenrock, Kathryn M McClintock, James B Amsler, Charles D Angus, Robert A |
| author_facet | Schram, Julie B Schoenrock, Kathryn M McClintock, James B Amsler, Charles D Angus, Robert A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Elevated atmospheric pCO2 concentrations are triggering seawater pH reductions and seawater temperature increases along the western Antarctic Peninsula (WAP). These factors in combination have the potential to influence organisms in an antagonistic, additive, or synergistic manner. The amphipods Gondogeneia antarctica and Paradexamine fissicauda represent prominent members of macroalgal-associated mesograzer assemblages of the WAP. Our primary objective was to investigate amphipod behavioral and physiological responses to reduced seawater pH and elevated temperature to evaluate potential cascading ecological impacts. For 90 d, amphipods were exposed to combinations of seawater conditions based on present ambient (pH 8.0, 1.5°C) and predicted end-of-century conditions (pH 7.6, 3.5°C). We recorded survival, molt frequency, and macroalgal consumption rates as well as change in wet mass and proximate body composition (protein and lipid). Survival for both species declined significantly at reduced pH and co-varied with molt frequency. Consumption rates in G. antarctica were significantly higher at reduced pH and there was an additive pH-temperature effect on consumption rates in P. fissicauda. Body mass was reduced for G. antarctica at elevated temperature, but there was no significant effect of pH or temperature on body mass in P. fissicauda. Exposure to the pH or temperature levels tested did not induce significant changes in whole body biochemical composition of G. antarctica, but exposure to elevated temperature resulted in a significant increase in whole body protein content of P. fissicauda. Our study indicates that while elevated temperature causes sub-lethal impacts on both species of amphipods, reduced pH causes significant mortality. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_870407 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods Schram, Julie B Schoenrock, Kathryn M McClintock, James B Amsler, Charles D Angus, Robert A Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Antarctic; Aragonite saturation state; Aragonite saturation state, standard deviation; Arthropoda; Behaviour; Benthic animals; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Consumption rate per individual; Date; Dry mass; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gondogeneia antarctica; Growth/Morphology; Incubation duration; Individuals; Laboratory experiment; Lipids; Monitoring station; MONS; Mortality/Survival; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Palmer_station; Paradexamine fissicauda; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, standard deviation; pH, total scale; Polar; Potentiometric titration; Proteins; Registration number of species; Salinity; Salinity, standard deviation; Sample ID; Single species; Species; Spectrophotometric; Temperature; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Uniform resource locator/link to reference; Wet mass Elevated atmospheric pCO2 concentrations are triggering seawater pH reductions and seawater temperature increases along the western Antarctic Peninsula (WAP). These factors in combination have the potential to influence organisms in an antagonistic, additive, or synergistic manner. The amphipods Gondogeneia antarctica and Paradexamine fissicauda represent prominent members of macroalgal-associated mesograzer assemblages of the WAP. Our primary objective was to investigate amphipod behavioral and physiological responses to reduced seawater pH and elevated temperature to evaluate potential cascading ecological impacts. For 90 d, amphipods were exposed to combinations of seawater conditions based on present ambient (pH 8.0, 1.5°C) and predicted end-of-century conditions (pH 7.6, 3.5°C). We recorded survival, molt frequency, and macroalgal consumption rates as well as change in wet mass and proximate body composition (protein and lipid). Survival for both species declined significantly at reduced pH and co-varied with molt frequency. Consumption rates in G. antarctica were significantly higher at reduced pH and there was an additive pH-temperature effect on consumption rates in P. fissicauda. Body mass was reduced for G. antarctica at elevated temperature, but there was no significant effect of pH or temperature on body mass in P. fissicauda. Exposure to the pH or temperature levels tested did not induce significant changes in whole body biochemical composition of G. antarctica, but exposure to elevated temperature resulted in a significant increase in whole body protein content of P. fissicauda. Our study indicates that while elevated temperature causes sub-lethal impacts on both species of amphipods, reduced pH causes significant mortality. |
| title | Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
| topic | Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Antarctic; Aragonite saturation state; Aragonite saturation state, standard deviation; Arthropoda; Behaviour; Benthic animals; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Consumption rate per individual; Date; Dry mass; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gondogeneia antarctica; Growth/Morphology; Incubation duration; Individuals; Laboratory experiment; Lipids; Monitoring station; MONS; Mortality/Survival; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Palmer_station; Paradexamine fissicauda; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, standard deviation; pH, total scale; Polar; Potentiometric titration; Proteins; Registration number of species; Salinity; Salinity, standard deviation; Sample ID; Single species; Species; Spectrophotometric; Temperature; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Uniform resource locator/link to reference; Wet mass |
| url | https://doi.org/10.1594/PANGAEA.870407 |