Sinking of Heterosigma akashiwo results in increased toxicity of this harmful algal bloom species

被引:17
|
作者
Powers, Lucas [1 ]
Creed, Irena F. [1 ]
Trick, Charles G. [1 ,2 ]
机构
[1] Univ Western Ontario, Dept Biol, London, ON N6A 5B7, Canada
[2] Univ Western Ontario, Dept Microbiol & Immunol, Schulich Sch Med & Dent, London, ON N6A 5B7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Heterosigma akashiwo; Sinking; Bioassays; Toxicity; Bloom propagation; CHLOROMONAD FLAGELLATE HETEROSIGMA; PHYTOPLANKTON; GROWTH; RATES; EUTROPHICATION; TEMPERATURE; SURVIVAL; STRAINS; IRON;
D O I
10.1016/j.hal.2011.10.007
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Notable physiological responses such as toxicity and sinking rates of the red tide forming raphidophyte Heterosigma akashiwo are correlated with high levels of macronutrient stress. Individual cells of this species are also capable of forming benthic vegetative cysts that overwinter in marine sediment and contribute to bloom propagation in subsequent seasons. It was hypothesized that there is variability in the rates of sinking within cell cultures and that sinking cells are more toxic than the neutrally buoyant or floating cells. Using laboratory-based settling columns, various isolates of H. akashiwo were allowed to separate, and the toxicities of sinking and floating populations were analyzed. Sinking and floating rates were significantly higher during the late stationary growth phase for all isolates. For two H. akashiwo isolates, sinking populations were significantly more toxic than those that were positively buoyant. A similar trend was observed in a third strain, however the relationship was not significant. Differences in adaptive ecophysiology among the different strain likely caused the variation. It is suggested that the most toxic cells within a bloom are those found at the lower depths, potentially interacting with the benthic community or ensuring that subsequent bloom propagation contains cells with the potential for toxicity. (C) 2011 Elsevier By. All rights reserved.
引用
收藏
页码:95 / 104
页数:10
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