The large-scale distribution of <em>Trichodesmium</em> in the tropical and subtropical Pacific Ocean and the southern Indian Ocean

ZHANG Dong-sheng; WANG Chun-sheng; WANG Xiao-gu; LIU Zhen-sheng; GAO Xiao-hui

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ZHANG Dong-sheng, WANG Chun-sheng, WANG Xiao-gu, LIU Zhen-sheng, GAO Xiao-hui. The large-scale distribution of Trichodesmium in the tropical and subtropical Pacific Ocean and the southern Indian Ocean[J]. Haiyang Xuebao, 2010, 32(4): 148-154.

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ZHANG Dong-sheng, WANG Chun-sheng, WANG Xiao-gu, LIU Zhen-sheng, GAO Xiao-hui. The large-scale distribution of Trichodesmium in the tropical and subtropical Pacific Ocean and the southern Indian Ocean[J]. Haiyang Xuebao, 2010, 32(4): 148-154.

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The large-scale distribution of Trichodesmium in the tropical and subtropical Pacific Ocean and the southern Indian Ocean

1.
Laboratory of State Oceanic Administration for Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;College of Life Sciences, Zhejiang University, Hangzhou 310027, China
2.
Laboratory of State Oceanic Administration for Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2009-10-28

Abstract

Abstract

Trichodesmium abundances were studied in the tropical and subtropical Pacific Ocean and the southern Indian Ocean from May 2008 to February 2009. The study area was divided into five districts including the northwest subtropical Pacific (NWSP), the central tropical Pacific (CTP), the eastern tropical Pacific (ETP), the tropical southeast Asia sea areas(TSAS) and the southern Indian Ocean (SIO). Results show that Trichodesmium trichome abundances vary between 0 and 130 10³ m^-3. The average abundances of Trichodesmium in the TSAS and the NWSP are 33.3 10³ m^-3(5.75×10³~130×10³ m^-3) and 25.2×10³ m^-3(2×10³~81.3×10³ m^-3) respectively, which are higher than in the CTP, the ETP and the SIO, where average abundances of Trichodesmium are 1.76 10³ m^-3(0~10.3×10³ m³), 0.87×10³ m³(0~7.75 10³ m^-3) and 1.52×10³ m^-3(0~8 10³ m^-3) respectively. No correlation between the surface water temperature and Trichodesmium abundance were found, however, iron flux from atmosphere seemed to be a hint to Trichodesmium abundances, which need to be studied further. Total chlorophyll a(chl a)concentration had a different distribution characteristics from Trichodesmium abundances, which was lower in the NWSP and the SIO but higher in the CTP, the ETP and the TSAS. The phytoplankton community was composed mostly of picophytoplankton, chl a in the 0.2~2 μm size fraction accounted for more than 60% of the total chl a, while Trichodesmium chl a made up a very small proportion of total chl a. N₂-fixation rates of Trichodesmium are estimated, N₂-fixation by Trichodesmium is greeter than 30% new nitrogen sources in the NWSP but much lower in the CTP and the ETP.
- Trichodesmium,
- chlorophyll a,
- N₂-fixation,
- large-scale distribution

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