Physiological and ecological characteristics of the deep-sea microorganisms in tropical Pacific Ocean

LUO Zhu-hua; PEI Yao-wen; HUANG Xiang-ling; YE De-zan

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LUO Zhu-hua, PEI Yao-wen, HUANG Xiang-ling, YE De-zan. Physiological and ecological characteristics of the deep-sea microorganisms in tropical Pacific Ocean[J]. Haiyang Xuebao, 2006, 28(5): 130-137.

Citation:

LUO Zhu-hua, PEI Yao-wen, HUANG Xiang-ling, YE De-zan. Physiological and ecological characteristics of the deep-sea microorganisms in tropical Pacific Ocean[J]. Haiyang Xuebao, 2006, 28(5): 130-137.

LUO Zhu-hua, PEI Yao-wen, HUANG Xiang-ling, YE De-zan. Physiological and ecological characteristics of the deep-sea microorganisms in tropical Pacific Ocean[J]. Haiyang Xuebao, 2006, 28(5): 130-137.

Citation:

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Physiological and ecological characteristics of the deep-sea microorganisms in tropical Pacific Ocean

The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;The Key Laboratory of Marine Biogenetic Resource of State Oceanic Administration, Xiamen 361005, China

Received Date: 2005-05-24
Rev Recd Date: 2005-12-25

Abstract

Abstract

31 cultures of the 110 microbial strains, which were isolated from deep-sea samples taken in tropical Pacific Ocean in Summer and Autumn, 2001, were selected for this research.The characters of their morphologies and of their adapting to the physical and chemical factors were studied, and the identification of these strains and their carbon-utilizing patterns were performed by Biolog Microstation System.The results demonstrated that the tested strains consisted of 2 yeasts, 21 Gram-positive bacteria and 8 Gram-negative bacteria, of which the Grampositive bacteria were dominant in the sediment samples while the Gram-negative bacteria were in the majority in the samples of sea waters and blue-greenalgaes.The adaptability of these st rains for different environmental factors (temperature, salinity and pH) was studied and it was found that less than 1/3 of the tested strains showed stenotropic adaption to the environmental factors, while a large proportion of the cultures was eurytropic microo rganisms with wideecological amplitude.On the other hand, among these microo rganisms, psycho trophs, moderate halophiles and alkalit olerant bacteria were in very high percentages.Furthermore most of the strains from blue-greenalgae samples could not,but those from over-laid water and sediment samples were able to, grow at 4.All these results incarnated the response of microorg anisms to their living environments.12 strains of the to taltested microo rganisms could be given the taxonomic results by the database of Biolog Microstation System.According to the carbon-utilizing spectra of the 15 strains of Grampositive bacteria vs 95 types of organic carbons in Boilog GP 2 Microplates, the numbers of the utilizable carbon sources showed a greatrange from 3 to 46 single organic carbons for each strain, embodying the great diversity of nutrition types in deep sea microorg anisms.Among the utilizable carbons, 8 types could be used by more than half of the tested Gram-positive bact eria.These organic carbon so urces are the important intermediatemet abolite in all kinds of metabolic pathway for microorg anisms.
- tropical Pacific Ocean,
- deep-sea microorganisms,
- physiological and ecological characteristics,
- Biolog Microstation System

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