不同接种密度条件下海洋酸化对坛紫菜叶状体的生理生态影响

人工栽培的坛紫菜(Pyropia haitanensis)具有重要的经济意义和生态功能,非常有必要研究海洋酸化对坛紫菜的影响.本研究通过充入高CO2浓度(1000×10-6)的空气模拟海洋酸化,探讨了不同接种密度条件下海洋酸化对坛紫菜叶状体的生理生态学效应.结果表明,长约1 cm的叶状体接种密度从1株/dm3提高到3株...

Effects of ocean acidification on the thallus eco-physiology of Pyropia haitanensis incubated in different densities

It is necessary to study the effect of ocean acidification (OA) on Pyropia haitanensis which is an important economic species ecologically. In this study, we investigated the physiological and ecological effects of ocean acidification on P. haitanensis thalli by simulating ocean acidification with an aerated culture of CO₂ enriched-air (1 000×10^-6).The results showed that the specific growth rate was significantly decreased by 14.8% when incubation density of 1 cm thallus increased from one thallus per litre to three thalli per litre. At condition with low incubation densities, OA reduced the specific growth rate by 6.7%. On the contrary, at condition with higher incubation densities, OA increased the specific growth rate by 6.7%. This suggests that higher density incubation can partially alleviate the negative effects of OA. Regardless of the incubation density, OA did not affect significantly on Fv/Fm, total protein content, pigment content, and carbon, nitrogen and phosphorus contents of algal tissue while it significantly reduced the release of particulate organic carbon (POC). In particular, under lower density incubation, OA increased significantly the release of dissolved organic carbon (DOC) by 70.2%. In summary, the effects of OA on the carbon accumulation rate and organic matter release from the thalli were dependent on the incubation density.