Abstract
The recent accelerated ocean acidification and global warming caused by increased atmospheric carbon dioxide may have an impact on the physiology and ecology of marine animals. This study was conducted to determine the egg production rate (EPR) and hatching success (EHS) of Acartia ohtsukai in response to the combined effects of an increase in temperature and a lower pH. Acartiaohtsukai with fresh surface seawater were collected in the northwestern Yeoja Bay of Korea in September 2017. The temperature and pH conditions applied included two different pH levels (representing the present: 7.9 and the future: 7.6) and three temperature values (26 °C, 28 °C, and 30 °C). In the pH 7.9, EPR significantly increased with increased temperature, but in pH 7.6, it significantly decreased as the temperature increased. EHS was lower in pH 7.6 than in pH 7.9. These results suggest that changes in the marine environment due to global warming and ocean acidification may affect Acartia populations and cause overall fluctuations in copepods of the genus Acartia.
Highlights
The atmospheric CO2 concentration has increased rapidly, owing to human activities since the IndustrialRevolution
These results suggest that changes in the marine environment due to global warming and ocean acidification may affect Acartia populations and cause overall fluctuations in copepods of the genus
Female copepods show variations in reproductive capacity depending on environmental conditions, such as food quality and quantity, population density, etc. [12,30,31,32]
Summary
The atmospheric CO2 concentration has increased rapidly, owing to human activities since the IndustrialRevolution. The atmospheric CO2 concentration has increased rapidly, owing to human activities since the Industrial. Global warming has been a key topic of climate change. Panel on Climate Change) predicts that the average sea level temperature will rise by 0.6 ◦ C (RCP 2.6 scenario) and 2.0 ◦ C (RCP 8.5 scenario) during this century. The atmospheric pCO2 is expected to rise continuously to 670–936 μatm in 2100, reducing the pH of the seawater surface by 0.2–0.3 (RCP 6.0 and RCP 8.5) [1]. These changes may affect the behavior and physiology of marine animals [2,3]
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