Seawater carbonate chemistry and somatic and otolith growth relationship of Symphodus ocellatus

• Main Authors: Di Franco, Antonio, Calo, Antonio, Sdiri, Khalil, Cattano, Carlo, Milazzo, Marco, Guidetti, Paolo
• Format: Dataset
• Language: English
• Published: PANGAEA 2019
• Subjects: Age; Alkalinity; total; Animalia; Aragonite saturation state; Baia_di_Levante; Bicarbonate ion; 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; Chordata; CO2 vent; EXP; Experiment; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Identification; Length; Mediterranean Sea; Nekton; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide; standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Potentiometric; Potentiometric titration; Registration number of species; Salinity; Sampling date; Single species; Site; Species; Symphodus ocellatus; Temperate; Temperature; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.919321; https://doi.org/10.1594/PANGAEA.919321

Ocean acidification (OA) may have varied effects on fish eco-physiological responses. Most OA studies have been carried out in laboratory conditions without considering the in situ pCO2/pH variability documented for many marine coastal ecosystems. Using a standard otolith ageing technique, we assessed how in situ ocean acidification (ambient, versus end-of-century CO2 levels) can affect somatic and otolith growth, and their relationship in a coastal fish. Somatic and otolith growth rates of juveniles of the ocellated wrasse Symphodus ocellatus living off a Mediterranean CO2 seep increased at the high-pCO2 site. Also, we detected that slower-growing individuals living at ambient pCO2 levels tend to have larger otoliths at the same somatic length (i.e. higher relative size of otoliths to fish body length) than faster-growing conspecifics living under high pCO2 conditions, with this being attributable to the so-called 'growth effect'. Our findings suggest the possibility of contrasting OA effects on fish fitness, with higher somatic growth rate and possibly higher survival associated with smaller relative size of otoliths that could impair fish auditory and vestibular sensitivity.