Growth response of Heterosigma akashiwo to the changes of CO2 concentration, temperature and nutrient

doi:10.3969/j.issn.1000-5641.2023.03.011

Abstract

Abstract:

Heterosigma akashiwo is one of the species of harmful algal blooms (HABs) threatening marine ecosystems and the fishing industry across coastal waters worldwide. With increasing global levels of atmospheric CO₂ and global warming, HABs have increased in prevalence, duration, and geographic span; this phenomenon has been further stressed by intensified anthropogenic influences, such as eutrophication. Through controlled experiments with different nutrients, CO₂ concentrations, and temperatures, our study aimed to understand the response of H. akashiwo to different nutrients with changes in climate. In all simulated CO₂ and temperature scenarios, both cell density and the specific growth rate of H. akashiwo in the low phosphorus groups were significantly lower than those in the high phosphorus groups. Furthermore, the maximum cell density and specific growth rate of H. akashiwo were significantly enhanced by increased CO₂, while the specific growth rate was accelerated by the dual effect of increased CO₂ levels and temperature. The growth response of H. akashiwo to CO₂ and temperature was similar between different nutrient treatments. Taken together, the results indicate that phosphorus concentration could be the major factor controlling the growth of H. akashiwo, and the intensity and risk of H. akashiwo blooming in the future is increasing. Hence, controlling the increase of nutrients, particularly phosphate, could be a critical pathway to decrease the occurrence of H. akashiwo blooms. In summary, our case study provides scientific support for marine ecological management of HABs.

Key words: harmful algal blooms, Heterosigma akashiwo, CO₂ concentration, warming, nutrient

CLC Number:

P735

Anqiang YANG, Lixia ZHAO, Shuzhen SONG, Jie LIU, Yanlong HE, Yanna WANG. Growth response of Heterosigma akashiwo to the changes of CO₂ concentration, temperature and nutrient[J]. Journal of East China Normal University(Natural Science), 2023, 2023(3): 108-117.

Figures/Tables 6

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时间	F 值							p 值
时间	N	P	Climate	N × P	N × Climate	P × Climate	N × P × Climate	N	P	Climate	N × P	N × Climate	P × Climate	N × P × Climate
第0天	0.367	0.719	0.521	0.536	0.298	0.300	1.285	0.551	0.405	0.600	0.474	0.745	0.744	0.295
第1天	0.664	1.529	208.996	6.341	0.227	2.099	11.931	0.423	0.228	< 0.001***	0.019*	0.799	0.144	< 0.001***
第2天	7.052	6.296	459.440	3.756	3.163	5.73	4.325	0.014*	0.019*	< 0.001***	0.064	0.060	0.009**	0.025*
第3天	0.802	8.421	81.662	2.582	0.245	9.941	1.487	0.379	0.008**	< 0.001***	0.121	0.784	< 0.001***	0.246
第4天	0.045	30.953	1.492	6.708	0.408	5.963	0.254	0.834	< 0.001***	0.245	0.016*	0.669	0.008**	0.778
第5天	18.974	145.600	18.732	0.006	0.253	14.562	1.609	< 0.001***	< 0.001***	< 0.001***	0.936	0.778	< 0.001***	0.221
第6天	5.524	78.774	18.032	2.198	0.024	0.156	0.674	0.027*	< 0.001***	< 0.001***	0.151	0.977	0.857	0.519
第7天	3.828	101.263	61.336	5.960	2.590	4.006	3.306	0.062^?	< 0.001***	< 0.001***	0.022*	0.096	0.032*	0.054
第8天	20.238	66.131	100.180	4.928	1.305	2.138	0.136	< 0.001***	< 0.001***	< 0.001***	0.036*	0.289	0.139	0.873
第9天	5.299	85.122	108.113	0.921	2.757	8.403	2.553	0.030*	< 0.001***	< 0.001***	0.347	0.084	0.002*	0.098

因子	F值	p值
N	0.498	0.487
P	20.277	< 0.001***
Climate	116.444	< 0.001***
N × P	0.588	0.451
N × Climate	0.868	0.433
P × Climate	0.725	0.495
N × P × Climate	0.069	0.933

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Growth response of Heterosigma akashiwo to the changes of CO₂ concentration, temperature and nutrient

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