Effects of temperature, salinity, and irradiance on the growth of harmful algal bloom species <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) isolated from the South China Sea -- Journal of Oceanology and Limnology,2017,35(3):557-565

	Cite this paper:
	XU Ning, HUANG Bozhu, HU Zhangxi, TANG Yingzhong, DUAN Shunshan, ZHANG Chengwu. Effects of temperature, salinity, and irradiance on the growth of harmful algal bloom species Phaeocystis globosa Scherffel (Prymnesiophyceae) isolated from the South China Sea[J]. Journal of Oceanology and Limnology, 2017, 35(3): 557-565

Effects of temperature, salinity, and irradiance on the growth of harmful algal bloom species Phaeocystis globosa Scherffel (Prymnesiophyceae) isolated from the South China Sea

XU Ning¹, HUANG Bozhu¹, HU Zhangxi², TANG Yingzhong², DUAN Shunshan¹, ZHANG Chengwu¹

1 Institute of Hydrobiology, Jinan University, Guangzhou 510632, China;
2 Key Laboratory of Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Abstract:

Blooms of Phaeocystis globosa have been frequently reported in Chinese coastal waters, causing serious damage to marine ecosystems. To better understand the ecological characteristics of P. globosa in Chinese coastal waters that facilitate its rapid expansion, the effects of temperature, salinity and irradiance on the growth of P. globosa from the South China Sea were examined in the laboratory. The saturating irradiance for the growth of P. globosa (I_s) was 60 μmol/(m²·s), which was lower than those of other harmful algal species (70–114 μmol/(m²·s)). A moderate growth rate of 0.22/d was observed at 2 μmol/ (m²·s) (the minimum irradiance in the experiment), and photo-inhibition did not occur at 230 μmol/(m²·s) (the maximum irradiance in the experiment). Exposed to 42 different combinations of temperatures (10– 31℃) and salinities (10–40) under saturating irradiance, P. globosa exhibited its maximum specific growth rate of 0.80/d at the combinations of 24℃ and 35, and 27℃ and 40. The optimum growth rates (>0.80/d) were observed at temperatures ranging from 24 to 27℃ and salinities from 35 to 40. While P. globosa was able to grow well at temperatures from 20℃ to 31℃ and salinities from 20 to 40, it could not grow at temperatures lower than 15℃ or salinities lower than 15. Factorial analysis revealed that temperature and salinity has similar influences on the growth of this species. This strain of P. globosa not only prefers higher temperatures and higher salinity, but also possesses a flexible nutrient competing strategy, adapted to lower irradiance. Therefore, the P. globosa population from South China Sea should belong to a new ecotype. There is also a potentially high risk of blooms developing in this area throughout the year.

Received: 2015-11-18 Revised: 2016-01-25

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Articles by HUANG Bozhu

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Articles by ZHANG Chengwu

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