Short term high-CO2 exposure of larval bay scallops (Argopecten irradians) causes latent effects


Thursday, July 12, 2012
Redfield Auditorium - 12:00 Noon
Ms. Meredith White
Ph.D. Candidate, Joint Program in Biological Oceanography

Marine invertebrates are particularly vulnerable to environmental stressors during larval development.  Continuous exposure to decreased pH and CaCO3 saturation state, known as ocean acidification (OA), has been shown to have detrimental effects on bivalve larvae.  However, bivalve larvae developing in coastal and estuarine systems likely encounter variable CO2 conditions, and their response to this variability is currently unknown.  We hypothesized that exposure to elevated CO2 conditions during critical initial shell-formation (1-3 days post-fertilization) of the bay scallop Argopecten irradians followed by exposure to ambient CO2 conditions, would negatively affect the larva’s subsequent development and survival.  We show that exposure to elevated CO2 (2200 ppm, a value found in local estuaries during summer months) during the first three days of development has latent effects on growth and possibly on survival throughout the larval period and that exposure to elevated CO2 for as little as 12 hours negatively affects larval growth.