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Program |
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Special Session 1: Ecosystem under multiple stressors |
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CO2 rise shortens life cycle span of a green tide alga
SS1-19
Juntian Xu* , Huaihai institute of technology
Presenter Email: jtxu@hhit.edu.cn
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| Green tide blooms occur in temperate and tropical habitats around the world, impacting North America, Europe and the Asia-Pacific region. In the Chinese coastal waters, the world’s largest green-tide was observed for the first time in 2008, and has been occurring annually till today. Laboratory works show that elevated CO2 stimulates or has no significant impacts on macroscopic stage of the green tide algae, microscopic stages and life cycle responses have been neglected. Here we show that elevated CO2 and the concomitant pH drop (ocean acidification treatment: OA) and warming shorten the life cycle span in Ulva linza. with the biggest difference at lower temperature levels in growth and generation span in 1st generation between the ambient and elevated CO2 levels. Subsequently, we tested if OA may affect the green tide alga generation after generation from micro to macro then back to micro-stages up to ten generations at 20oC. The advancement of sporeling formation due to the OA was significant from the 2nd generations. The enhancement of growth rates by CO2 also increased with increased generations under OA. Our results suggest that, with progressive ocean acidification,warming and industrial pollutions, the world green algal blooms may expand w |
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