Insights into the effects of harmful algal bloom on ecological quality status using body-size spectrum of biofilm-dwelling ciliates in marine ecosystems
2020
Uroosa, | Kazmi, Syed Shabi Ul Hassan | Xu, Guangjian | Xu, Henglong
The effects of two harmful algae Alexandrium tamarense and Gymnodinium catenatum on ecological quality status were identified using biofilm-dwelling ciliate assemblage as test organism communities. The body-size spectra of the test ciliates were observed at a gradient of cell concentrations of both algal species: 10⁰ (control), followed by10², 10³, 10⁴ and 10⁵ cells ml⁻¹. The test ciliates showed clear variations in body-size spectra along the concentration gradients of both algal species. In terms of probability density, the ciliates generally peaked at low levels of algal concentrations (10⁰–10⁴ cells ml⁻¹) in small size forms, followed by the forms with large sizes at the concentration of 10⁵ cells ml⁻¹ of both algal species. Bootstrapped-average analysis demonstrated a significant change in body-size spectrum when algal concentrations were higher than 10⁴ cells ml⁻¹. It is suggested that the body-size spectrum of the ciliates may be used to indicate the effects of harmful algal bloom.
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