UV-B辐射对强壮前沟藻（Amphidinium carterae）和等鞭金藻（Isochrysis galbana）种间竞争的影响

摘要

In this paper, the effects of UV-B radiation on interspecific competition between Amphidinium carterae and Isochrysis galbana were studied using the co-culture method. The results showed that： in single culture experiments, with increased inoculums, both species entered the exponential growth phase and the plateau phase faster, and the maximum cell density reduced. In the mixed culture experiments, L galbana dominated in the competition with A. carterae in the A ： 1 = 1 ： 4 and the A ： I = 1 ： 1 treatments. In contrast, only under the A ： I = 4 ： 1 inoculation ratio did A. carterae exhibit inhibition to the growth of L galbana. UV-B irradiation effectively influenced the interspecific growth interaction of these two species. With increased UV-B irradiation, the competitive dominance of L galbana decreased in the A ： I = 1 ： 4 treatment and in some cases, A. carterae became relatively more competitive in the A ： I = 4 ： 1 treatment.%采用共培养的方法,研究了UV-B辐射对不同起始密度强壮前沟藻和等鞭金藻种间竞争的影响。结果表明,在单养时,随着起始密度的增加,2种微藻在生长过程中进入指数生长期和平台期的时间逐渐缩短,所达到的最大种群密度都依次降低。在混养时,当接种比例为A∶I=1∶4和A∶I=1∶1时,等鞭金藻在种间竞争中占有优势;当接种比例为A∶I=4∶1时,强壮前沟藻占有优势。UV-B辐射对两种微藻的种间竞争存在明显的影响。接种比例为A∶I=1∶4时,随着UV-B辐射时间的延长,等鞭金藻对强壮前沟藻的竞争优势逐渐降低,接种比例为A∶I=4∶1时,强壮前沟藻的竞争优势有所加强。