Combined effects of seawater acidification and nitrogen deficiency on <i>Gephyrocapsa oceanica</i>

Cai Xiaoxia; Yu Peisong; Zhang Haifeng; Hu Ji; Zhang Haina; Pan Jianming

doi:10.3969/j.issn.0253-4193.2016.04.012

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Cai Xiaoxia, Yu Peisong, Zhang Haifeng, Hu Ji, Zhang Haina, Pan Jianming. Combined effects of seawater acidification and nitrogen deficiency on Gephyrocapsa oceanica[J]. Haiyang Xuebao, 2016, 38(4): 130-138. doi: 10.3969/j.issn.0253-4193.2016.04.012

Citation:

Cai Xiaoxia, Yu Peisong, Zhang Haifeng, Hu Ji, Zhang Haina, Pan Jianming. Combined effects of seawater acidification and nitrogen deficiency on Gephyrocapsa oceanica[J]. Haiyang Xuebao, 2016, 38(4): 130-138. doi: 10.3969/j.issn.0253-4193.2016.04.012

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Combined effects of seawater acidification and nitrogen deficiency on Gephyrocapsa oceanica

doi: 10.3969/j.issn.0253-4193.2016.04.012

Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2015-07-21
Rev Recd Date: 2016-01-09

Abstract

Abstract

Combined influences of nutrients status and seawater CO₂ concentration on microalgae growth and physiology of Gephyrocapsa oceanic was investigated. It was shown that the abundance of G. oceanic significantly increased during CO₂ enrichment experiments at different nutrient levels (nitrogen-deficiency vs. nutrient-rich). However,the strongest response was observed in cell density and chlorophyll a concentration of G. oceanic when nitrogen was deficiency,suggesting low nutrients concentration and low N/P ratio might be favor to the cell growth. Besides,electron microscopy results indicated that seawater acidification had significant negative impact on the calcification and cell size distribution (became smaller) of G .oceanic when nitrogen was deficiency. However,in future oligotrophic open ocean,increasing CO₂ concentration might stimulate G. oceanic thrive.
- seawater acidification,
- CO₂ enrichment,
- nutrients,
- Coccolithophores

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References(25)

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