Seminar: “An integrative assessment of the biological consequences of CO2 seasonality in the Gulf of Maine for the thecosomatous pteropod Limacina retroversa”, 14 March 2016, Villefranche-sur-Mer, France

Date & time: 14 March 2016, 11 am

Location: Oceanographic Laboratory of Villefranche-sur-Mer, CNRS

Presented by Dr. Amy Maas, Bermuda Institute of Ocean Sciences (BIOS)

Limacina retroversa is a thecosomatous pteropod found year round in the Gulf of Maine. Because carbonate chemistry within this shelf system is spatially variable and exhibits seasonal cycles, pteropods in this region may already be exposed to under-saturated, and hence corrosive, waters during certain seasons. To understand the implications of this variability, we have explored the physiological responses of L. retroversa at four time points over the course of a year to determine whether pteropods vary seasonally in their sensitivity to CO2 exposure on time-scales relevant to acclimation responses. In the laboratory, these animals were exposed to CO2 (ambient, 800, 1200 ppm) for 7-14 days and their response was assessed using an integrated set of metabolic, gene-expression (RNAseq) and shell quality metrics. Concurrently, explorations of the effect of CO2 on the development of veligers were conducted to assess the sensitivity of this early life stage while studies of sinking and swimming rate were conducted to try to characterize the ecological implications of the change in shell condition. This set of studies provide an integrated picture of the seasonal effect of CO2 on this sentinel species on time-scales relevant to population level acclimation responses, identifies a window of acute sensitivity and characterizes some of the ecological implications of the CO2 exposure for thecosome pteropods.

This seminar is part of an ocean acidification seminar series organized by the Oceanographic Laboratory in Villefranche-sur-Mer (LOV), the Ocean Acidification International Coordination Centre (OA-ICC) and the Scientific Center of Monaco (CSM).

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