Parental exposure to elevated pCO2 influences the reproductive success of copepods

• Main Authors: Cripps, Gemma, Lindeque, Penelope K, Flynn, Kevin J
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Acartia tonsa; Alkalinity; total; standard deviation; Animalia; Aragonite saturation state; Arthropoda; Bicarbonate ion; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Egg production rate per female; Egg volume; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Hatching rate; Laboratory experiment; Laboratory strains; Nauplii recruitment per female; normalized; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Potentiometric; Potentiometric titration; Replicate; Reproduction; Salinity; Single species; Species; Temperature; Ocean acidification; Copepods
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.836732; https://doi.org/10.1594/PANGAEA.836732

Substantial variations are reported for egg production and hatching rates of copepods exposed to elevated carbon dioxide concentrations (pCO2). One possible explanation, as found in other marine taxa, is that prior parental exposure to elevated pCO2 (and/or decreased pH) affects reproductive performance. Previous studies have adopted two distinct approaches, either (1) expose male and female copepoda to the test pCO2/pH scenarios, or (2) solely expose egg-laying females to the tests. Although the former approach is more realistic, the majority of studies have used the latter approach. Here, we investigated the variation in egg production and hatching success of Acartia tonsa between these two experimental designs, across five different pCO2 concentrations (385-6000 µatm pCO2). In addition, to determine the effect of pCO2 on the hatching success with no prior parental exposure, eggs produced and fertilized under ambient conditions were also exposed to these pCO2 scenarios. Significant variations were found between experimental designs, with approach (1) resulting in higher impacts; here >20% difference was seen in hatching success between experiments at 1000 µatm pCO2 scenarios (2100 year scenario), and >85% at 6000 µatm pCO2. This study highlights the potential to misrepresent the reproductive response of a species to elevated pCO2 dependent on parental exposure.