2,2’,4,4’—四溴联苯醚对2种赤潮微藻种间竞争的影响

基于Logistic种群增长模型,研究了2,2’,4,4’—四溴联苯醚(BDE-47)的亚急性毒性胁迫对不同初始接种生物量比的赤潮异弯藻(Heterosigmaakashiwo)和米氏凯伦藻(Kareniamikimotoi)种间作用的影响.结果发现:不同的初始接种生物量比影响微藻间的竞争.加入0.05、0.25 mg/LBDE-47后,对于K. mikimotoi而言,不同初始生物量比的处理组表现出高浓度组的最大环境容纳量、种群瞬时增长率均大于低浓度组(P<0.05),而H. akashiwo高浓度组的最大环境容纳量、种群瞬时增长率均小于低浓度组(P<0.05).微藻之间的竞争表现出向着对K. mikimotoi有益方向发展的规律,因此一定浓度下的BDE-47干扰了两种微藻之间的竞争.

The effect of 2,2',4,4'-tetrabromodiphenyi ether on the inter-specific competition of two species of bloom microalgae

Based on the Logistic growth model, the effect of 2,2′,4,4′-tetrabromodiphenyl ether(BDE-47) on theinter-specific competitionof two marine bloom-forming microalgae, Heterosigmaakashiwo and Kareniamikimotoi, were investigated with different initial biomasses. The concentrations of BDE-47 were set at 0.05 and 0.25mg/L, and the experiment lasted for 18days. The results showed that different initial incubation biomasses played an important role in the competition of two kinds of microalgae. Then the competition results were similar in all treated groups with different biomasses in all treated groups. The value of maximum environmental capacity (K) and the intrinsic growth rates(r)increased for K. mikimotoiwith the increasing concentrations of BDE-47 while those decreased for H. akashiwo. It seemed that BDE-47 exposure broke the competitive balance to make competition gradually shift in favor of K. mikimotoiat some concentration.