三亚湾夏季原核生物的微型浮游动物摄食率与病毒裂解率*

doi:10.11978/2025006

Abstract

Abstract:

Studies on the temporal dynamics of carbon flux on prokaryotic organisms are limited, particularly in the South China Sea. During a month-long study in Sanya Bay, we examined the temporal dynamics of zooplankton grazing rate and viral lysis rate on prokaryotes. Our study revealed that prokaryotic growth rate (µ) surpassed the combined rates of viral lysis (v) and microzooplankton grazing (g), averaging (2.69 ± 0.66) d^-1 (1.61 ~ 3.87 d^-1). The viral lysis rate averaged (0.77 ± 0.34) d^-1 (0.31 ~ 1.21 d^-1), while the microzooplankton grazing rate averaged (0.83 ± 0.58) d^-1(0.12 ~ 1.88 d^-1). The carbon flux caused by viral lysis (C_v) and zooplankton grazing (C_g) on prokaryotes was nearly equal, each approximating 10⁶ fg·mL^-1. Negative correlations were observed between viral lysis rates and microzooplankton grazing rates, as well as between the percentage of prokaryotic cells lysed by viruses (P_v) and the percentage of prokaryotic cells grazed by microzooplankton (P_g). Conversely, a significant positive correlation was noted between viral lysis-caused carbon flux and microzooplankton grazing-caused carbon flux. Overall, viral lysis and microzooplankton grazing on prokaryotes exhibited substantial variability over the study period, with both processes contributing equally to prokaryotic mortality, highlighting their significance in prokaryotic carbon flux. Elucidating the carbon flow pathways on prokaryotes through time-series analysis in the South China Sea provides new data on marine productivity structure and carbon cycling mechanisms.

Key words: picophytoplankton, prokaryotes, carbon flux, viral lysis, microzooplankton grazing

CLC Number:

P735.122

LI Chunshan, ZHANG Jiandong, LONG Chao, LONG Lijuan, HUANG Sijun. Microzooplankton grazing rates and viral lysis rates on prokaryotes in summer Sanya Bay^*[J].Journal of Tropical Oceanography, 2025, 44(5): 97-107.

Figures/Tables 6

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Tab. 1

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参数	范围	平均值(X±SD)	参数	范围	平均值(X±SD)
温度/℃	26.10~29.40	28.33±1.16	Syn/(×10⁴cells·L^-1)	0.33~7.38	2.98±2.47
盐度/‰	31.97~33.73	32.99±0.43	PC_Syn/(×10²cells·L^-1)	1.0~15.00	6.38±4.39
DO/(mg·L^-1)	4.26~6.30	5.63±0.50	PE_Syn/(×10⁴cells·L^-1)	0.31~7.33	2.92±2.46
Chl a/(μg·L^-1)	4.26~6.30	0.39±0.17	Vir/(×10⁷VLPs·mL^-1)	0.11~2.82	1.00±0.78
${\text{NO}}_{\text{3}}^{-}$-N/(μmol·L^-1)	0.96~3.88	1.83±0.82	μ /d^-1	1.61~3.87	2.69±0.66
${\text{NO}}_{\text{2}}^{-}$-N/(μmol·L^-1)	0.09~0.26	0.15±0.04	v/d^-1	0.31~1.21	0.77±0.34
${\text{NH}}_{\text{4}}^{+}$-N/(μmol·L^-1)	1.51~4.23	2.84±0.70	g/d^-1	0.12~1.88	0.83±0.58
${\text{PO}}_{\text{4}}^{3-}$-P/(μmol·L^-1)	0.05~0.30	0.12±0.06	P_v/%	6.18~70.31	50.86±18.04
${\text{SiO}}_{\text{3}}^{2-}$-Si/(μmol·L^-1)	2.55~7.00	3.88±1.33	P_g/%	0.29~84.70	49.69±26.53
Prok/(×10⁵cells·L^-1))	2.33~14.00	5.79±4.07	C_v/(×10⁶fg·mL^-1)	0.18~7.75	2.66±2.11
PicoEuk/(×10³cells·L^-1)	0.01~4.20	1.82±1.46	C_g/(×10⁶fg·mL^-1)	0.01~9.51	2.81±2.61

Microzooplankton grazing rates and viral lysis rates on prokaryotes in summer Sanya Bay^*

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Microzooplankton grazing rates and viral lysis rates on prokaryotes in summer Sanya Bay*

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Microzooplankton grazing rates and viral lysis rates on prokaryotes in summer Sanya Bay^*