Increased anthropogenic CO_(2) emissions are leading to an increase in CO_(2) uptake by the world's oceans and seas,resulting in ocean acidification with a decrease in global ocean water pH by as much as 0.3–0.4 ...Increased anthropogenic CO_(2) emissions are leading to an increase in CO_(2) uptake by the world's oceans and seas,resulting in ocean acidification with a decrease in global ocean water pH by as much as 0.3–0.4 units by the year 2100.The direct effects of changing pCO_(2) on important microalgal feedstocks are not as well understood.Few studies have focused on lipid composition changes in specific algal species in response to ocean acidification and yet microalgae are an indispensable food source for various marine species,including juvenile shellfish.Isochrysis galbana and Tetraselmis suecica are widely used in aquaculture as feeds for mussels and other shellfish.The total lipid contents and concentrations of I.galbana and T.suecica were investigated when grown under present day(400 ppm)and ocean acidification conditions(1000 ppm)to elucidate the impact of increasing pCO_(2) on an important algae feedstock.Total lipids,long-chain alkenones(LCAs)and alkenoates decreased at 1000 ppm in I.galbana.I.galbana produces higher lipids than T.suecica,and is perhaps as a result more impacted by the change in carbon available for lipid production under higher pCO_(2).I.galbana is an important feedstock,more easily assimilated for growth in juvenile shellfish and reductions in lipid composition may prove problematic for the growth of future shellfish aquaculture.Our findings suggest that higher pCO_(2) impacts on algal lipid growth are species specific and warrant further study.It is therefore vital to examine the impact of high CO_(2) on algal lipid production,especially those commercial shellfish feed varieties to predict future impacts on commercial aquaculture.展开更多
基金funding from NERC Independent Research Fellowship[NE/N01409X/1].
文摘Increased anthropogenic CO_(2) emissions are leading to an increase in CO_(2) uptake by the world's oceans and seas,resulting in ocean acidification with a decrease in global ocean water pH by as much as 0.3–0.4 units by the year 2100.The direct effects of changing pCO_(2) on important microalgal feedstocks are not as well understood.Few studies have focused on lipid composition changes in specific algal species in response to ocean acidification and yet microalgae are an indispensable food source for various marine species,including juvenile shellfish.Isochrysis galbana and Tetraselmis suecica are widely used in aquaculture as feeds for mussels and other shellfish.The total lipid contents and concentrations of I.galbana and T.suecica were investigated when grown under present day(400 ppm)and ocean acidification conditions(1000 ppm)to elucidate the impact of increasing pCO_(2) on an important algae feedstock.Total lipids,long-chain alkenones(LCAs)and alkenoates decreased at 1000 ppm in I.galbana.I.galbana produces higher lipids than T.suecica,and is perhaps as a result more impacted by the change in carbon available for lipid production under higher pCO_(2).I.galbana is an important feedstock,more easily assimilated for growth in juvenile shellfish and reductions in lipid composition may prove problematic for the growth of future shellfish aquaculture.Our findings suggest that higher pCO_(2) impacts on algal lipid growth are species specific and warrant further study.It is therefore vital to examine the impact of high CO_(2) on algal lipid production,especially those commercial shellfish feed varieties to predict future impacts on commercial aquaculture.
