Impacts of Zn and Cu enrichment under ocean acidification scenario on a phytoplankton community from tropical upwelling system

被引:12
作者
Sharma, Diksha [1 ,5 ]
Biswas, Haimanti [1 ]
Silori, Saumya [1 ]
Bandyopadhyay, D. [1 ,4 ]
Shaik, Aziz Urrahman [1 ]
Cardinal, Damien [2 ]
Mandeng-Yogo, Magloire [3 ]
Ray, Durbar [1 ]
机构
[1] CSIR Natl Inst Oceanog, Biol Oceanog Div, Panaji 403004, Goa, India
[2] SU, CNRS, UMR7159, LOCEAN,IRD,MNHN, 4 Pl Jussieu, F-75005 Paris, France
[3] SU, CNRS, UMR7159, LOCEAN,IRD,MNHN, 32 Ave Henri Varagnat, F-93140 Bondy, France
[4] Natl Ctr Coastal Res, ICMAM PD NIOT Campus,Tambaram Main Rd, Chennai 600100, Tamil Nadu, India
[5] Bharathidasan Univ, Tiruchirappalli 620024, TN, India
关键词
Arabian sea; Upwelling; Ocean acidification; Copper; Zinc; Phytoplankton; Diatoms; MARINE-PHYTOPLANKTON; PHYSIOLOGICAL-RESPONSES; ANTHROPOGENIC CO2; COPPER TOXICITY; CARBON-DIOXIDE; DOMOIC ACID; SW BAY; DIATOM; GROWTH; COASTAL;
D O I
10.1016/j.marenvres.2020.104880
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Increasing dissolution of CO2 in the surface ocean is rapidly decreasing its pH and changing carbon chemistry which is further affecting marine biota in several ways. Phytoplankton response studies under the combination of elevated CO2 and trace metals are rare. We have conducted two consecutive onboard incubation experiments (R. V. Sindhu Sadhana; August 2017) in the eastern Arabian Sea (SW coast of India) during an upwelling event. A nutrient enriched diatom bloom was initiated onboard and grown under ambient (approximate to 400 mu atm, A-CO2) and high CO 2 levels (approximate to 1000 patm; H-CO2) with different zinc (Zn; 1 nM) and copper (Cu) concentrations (1 nM, 2 nM and 8 nM). Phytoplankton community composition and the dominant genera were different during these two experiments. CO2 enrichment alone did not show any significant growth stimulating impact on the experimental community except enhanced cell density in the first experiment. Addition of Zn at A-CO2 level revealed no noticeable responses; whereas, the same treatment under H-CO2 level significantly reduced cell number. Considerably high protein content under H-CO2+Zn treatment was possibly counteracting Zn toxicity which also caused slower growth rate. Cu addition did not show any noticeable impact on growth and biomass production except increased protein content as well as decreased carbohydrate: protein ratio. This can be attributed to relatively higher protein synthesis than carbohydrate to alleviate oxidative stress generated by Cu. The centric diatom Chaetoceros and toxin producing pennate diatom Pseudo-nitzschia showed no significant response to either CO2 or Zn enrichment. Large centric diatom Leptocylindrus and Skeletonema responded positively to Zn addition in both CO2 levels. The former species showed the most sensitive response at the highest Cu and H-CO2 treatment; whereas, the pennate diatoms Mtzschia and Pseudo-nttzschia (toxigenic diatom) showed higher resilience under elevated CO2 and Cu levels. This observation indicated that in future ocean, increasing CO2 concentrations and trace metal pollution may potentially alter phytoplankton community structure and may facilitate toxigenic diatom bloom in the coastal waters.
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页数:11
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