Copepods produced more eggs in warmer temperatures, but the increase was smaller when copepods were simultaneously exposed to warmer temperature and ocean acidification conditions (lower pH). When pH changed between egg production and hatching, fewer eggs hatched. Warmer egg production temperature induced a positive maternal effect and increased the egg hatching rate. Warmer hatching temperature resulted in earlier hatching.
Maternal effects may act as an adaptation mechanism for copepods facing pH and temperature changes
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