Abstract: Fishes are currently facing novel types of anthropogenic stressors that have never experienced in their evolutionary history, such as ocean acidification. Under these stressful conditions, energetically costly processes, such as reproduction, may be sacrificed for increased chances of survival. This trade-off does not only affect the organism itself but may result in reduced offspring fitness. In the present study, the effects of exposure to high pCO2 levels were tested on the reproductive performance of a temperate species, the two-spotted goby, Gobiusculus flavescens. Breeding pairs were kept under control (600 μatm, pH 8.05) and high pCO2 levels (2300 μatm, pH 7.60) conditions for a 4-month period. Additionally, oxidative stress and energy metabolism-related biomarkers were measured. Results suggest that reproductive activity is stimulated under high pCO2 levels. Parental pairs in the simulated ocean acidification conditions exhibited increased reproductive output, with 50% more clutches and 44% more eggs per clutch than pairs under control conditions. However, there was an apparent trade-off between offspring number and size, as larvae of parental pairs under high pCO2 levels hatched significantly smaller, suggesting differences in parental provisioning, which could be related to the fact that these females produce more eggs. Moreover, results support the hypothesis of different energy allocation strategies used by females under high pCO2 conditions. These changes might, ultimately, affect individual fitness and population replenishment.
Source: Supplement to: Faria, Ana M; Lopes, Ana F; Silva, Cátia S E; Novais, Sara C; Lemos, Marco F L; Gonçalves, Emanuel J (2018): Reproductive trade-offs in a temperate reef fish under high p CO 2 levels. Marine Environmental Research, 137, 8-15, https://doi.org/10.1016/j.marenvres.2018.02.027
Supplemental Information: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 by seacarb is 2019-04-15.
Coverage: EVENT LABEL: * LATITUDE: 38.466670 * LONGITUDE: -8.983330 * DATE/TIME START: 2015-07-14T00:00:00 * DATE/TIME END: 2015-08-12T00:00:00 * METHOD/DEVICE: Experiment