我国东海4种赤潮藻的细胞氮磷营养储存能力对比

Nutritional Storage Ability of Four Harmful Algae from the East China Sea

以我国东海海域近年来的4种代表性赤潮藻(硅藻中肋骨条藻和尖刺拟菱形藻、甲藻东海原甲藻和链状亚历山大藻)作为研究对象,测定和对比了其细胞氮磷营养储存能力及藻细胞利用胞内储存营养进行生长繁殖的生长潜力.结果表明,2种甲藻的RN值(41.5和42.4)和RP值(4.3和10.7)都明显高于2种硅藻的RN值(2.6和6.0)和RP值(2.5和1.2),4种赤潮藻在生活史策略上的差异决定了我国东海春季甲藻赤潮与硅藻赤潮呈现出演替型爆发的态势;2种甲藻的tN值(5.32和6.81d)和tP值(2.08和4.31d)明显高于2种硅藻的tN值(0.56和1.24d)和tP值(0.53和0.13d),2种甲藻的高生长潜力和k-生活史策略都有助于我国东海春季东海原甲藻和链状亚历山大藻伴生赤潮呈现出长时间持续的态势.

Four species of representative harmful algae from the East China Sea, Skeletonema costatum, Pseudo-nitzschia pungens, Prorocentrum donghaiense and Alexandrium catenella, were choosen as the target species. The nutritional storage ability of algal cells for nitrogen and phosphorus and the growth potential of four species were studied and contrasted. The results showed that the luxury coefficients of nitrogen RN （41.5 and 42.4） and phosphorus Rp （4.3 and 10.7） of P. donghaiense and A. catenella were higher than those of RN（2.6 and 6.0） and Rp（2.5 and 1.2） of S. costatum and P. pungens. The differences in the ecological strategy among the four species resulted in the successional spring blooming of dinoflagellates and diatoms in the East China Sea. The growth potentials of storage nitrogen tN（5.32 and 6.81 d） and storage phosphorus tp（2.08 and 4.31 d） ofP. donghaiense and A. catenella were higher than those oftN （0.56 and 1.24 d） and tp （0.53 and 0.13 d） of S. costatum and P. pungens. The higher growth potential and k-strategistis ofP. donghaiense and A. catenella are very important in co-occurring and long-lasting spring blooming in the East China Sea.