Seawater carbonate chemistry and fecundity in a serial broadcast spawning fish

• Main Authors: Concannon, Callie A, Cross, Emma L, Jones, Lucas F, Murray, Christopher S, Matassa, Catherine M, McBride, Richard S, Baumann, Hannes
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Age; Alkalinity; total; standard deviation; Animalia; Aragonite saturation state; 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; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Date; Diameter; Eggs; Embryos; EXP; Experiment; Fecundity; Female; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gonad; wet mass; Gonadosomatic index; Identification; Individual ID; Laboratory experiment; Length; Menidia menidia; Mumford_Cove_Exp; Nekton; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.943465; https://doi.org/10.1594/PANGAEA.943465

Experiments examining fish sensitivities to future oceanic CO2 levels have greatly expanded over past decades and identified many potentially affected traits. Curiously, data on reproductive trait responses to high CO2 are still scarce, despite their strong link to Darwinian fitness and thus to population vulnerability to ocean acidification. We conducted two rearing experiments on the first broadcast-spawning marine fish model (Atlantic silverside, Menidia menidia) to examine how long-term and novel whole life-cycle exposures to predicted future CO2 levels (∼2,000 µatm) affect laboratory spawning, temperature-specific reproductive investment, fecundity, and size distributions of maturing oocytes. At low temperatures (17°C), female body size and therefore potential fecundity (FPot, oocytes/female) slightly increased with CO2, while relative fecundity (FRel, oocytes/g female) remained unaffected. At high temperatures (24°C), high CO2 substantially reduced both FPot (−19%) and FRel (−28%) relative to control treatments. Irrespective of CO2, females at 24°C grew larger and heavier than those at 17°C, and although larger females produced larger oocytes at some developmental stages, they also had lower gonadosomatic indices and lower FRel. Our findings contrast with most previous studies and thus highlight the need to investigate reproductive impacts of increasing CO2 on multiple fish species with contrasting life history strategies.