Location: Bowdoin / Calendar


Critical high-pCO2 exposure windows during early development of larval bay scallops

  • 10/10/2013 | 4:00 PM – 4:55 PM
  • Location: Druckenmiller Hall, Room 020
  • Event Type: Seminar

Critical high-pCO2 exposure windows during early development of larval bay scallopsMeredith White, Bigelow Laboratory for Ocean Sciences

Increases in environmental pCO2 levels negatively affect growth and development in early life stages of many marine invertebrates, but it is not clear what processes are involved, nor which developmental stage are most sensitive. We investigated the effects of exposure to high CO2 during two different stages in larval development of the bay scallop Argopecten irradians: embryonic development prior to shell calcification (2-12 h post-fertilization), and initiation of shell calcification (12-24 h post-fertilization). We found that larvae exposed to high CO2 during initial calcification developed smaller shells than those in ambient conditions. In contrast, larvae exposed to high CO2 prior to shell-formation and calcification (2-12 h post-fertilization), developed an abnormal indentation in the shell, even if they were switched into ambient conditions afterwards, through initial calcification. Together, these results demonstrate two critical high-pCO2 exposure windows during bay scallop larval development, which produce negative, but distinctly different, effects on larval shell development.