Dynamics of autotrophic picoplankton and heterotrophic bacteria in the East China Sea

Jiao, Nianzhi; Yang, Yanhui; Hong, Nian; Ma, Ying; Harada, Shigeki; Koshikawa, Hiroshi; Watanabe, Masataka

doi:10.1016/j.csr.2005.01.002

Cited by 146 publications

(135 citation statements)

References 42 publications

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“…This observation on Synechococcus abundance is consistent with previous reports (e.g. Jiao et al 2005) that they were numerically abundant in the water with high availability of nutrients. These results suggest that nanocyanobacteria probably prosper where Synechococcus are limited by low availability of nutrients, especially nitrate, as observed in competition experiments using laboratory cultures (Agawin et al 2007).…”

Section: Relationships With Other Cyanobacteriasupporting

confidence: 82%

Distribution of nano-sized Cyanobacteria in the western and central Pacific Ocean

Sato¹,

Hashihama²,

Kitajima

et al. 2010

Aquat. Microb. Ecol.

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We investigated the distribution of nano-sized unicellular Cyanobacteria (nanocyanobacteria) in the Pacific Ocean. Nanocyanobacteria were distributed in the mixed layer throughout the western and central regions of the North and South Pacific subtropical gyres, where nitrate depletion and high irradiance are maintained throughout the year. Their maximum occurrence of >5 × 10 9 cells m -2 was found between 12 and 27°N and 10 and 21°S. These areas with high nanocyanobacterial abundance largely correspond with those with high nitrogen fixation activity. In particular, the biomass of nanocyanobacteria was comparable with or larger than Synechococcus between 10 and 20°N, while in the other regions, Synechococcus was overwhelmingly dominant. Where phosphorus was exhausted at the surface, they were comparatively sparse, even within the western subtropical gyres. In the subtropical and tropical provinces other than the western subtropical gyres, nanocyanobacteria were very sparse, even under similar nutrient conditions where nitrate was depleted and phosphorus was detectable. They may be competing with pico-sized Synechococcus and large filamentous diazotrophic Cyanobacteria Trichodesmium for various resources. Their patchy distribution suggests that the mechanism of nitrogen cycling also varies patchily in the oligotrophic region of the Pacific Ocean.KEY WORDS: Picophytoplankton · Nanophytoplankton · Cyanobacteria · Synechococcus · Pacific subtropical gyres · Cross-basin distribution · Nitrogen fixation Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 59: [273][274][275][276][277][278][279][280][281][282] 2010 ber & Sarmiento 1997, Deutsch et al. 2001. Additionally, gaseous nitrogen fixation provides the nitrogenlimiting ocean surface with reduced nitrogen, which is available to nondiazotrophs after regeneration by zooplankton or released in the form of dissolved organic compounds (Capone et al. 1994). Traditionally, oceanic nitrogen fixation was considered to be carried out mainly by the filamentous Cyanobacteria of the genus Trichodesmium in the oligotrophic subtropical and tropical waters (Capone et al. 1997). However, after recent observations, nano-sized unicellular Cyanobacteria (nanocyanobacteria) are gaining increasing attention from biogeochemists as important marine nitrogen fixers (Montoya et al. 2004). Molecular biological techniques have revealed that the genes attributable to the nano-sized diazotrophic Cyanobacteria occur extensively in subtropical and tropical waters including the Pacific Ocean (Zehr et al. 2001, Falcón et al. 2004a, Church et al. 2005, Atlantic Ocean (Falcón et al. 2004a, Langlois et al. 2005, Arabian Sea (Mazard et al. 2004) and in Pacific temperate waters (Needoba et al. 2007).While their potential significance in biogeochemical material cycling in the subtropical ocean is well recognized, global distribution of nano-sized Cyanobacteria and their environmental controlling factors are still unknown, since previous observation...

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Section: Relationships With Other Cyanobacteriasupporting

confidence: 82%

Distribution of nano-sized Cyanobacteria in the western and central Pacific Ocean

Sato¹,

Hashihama²,

Kitajima

et al. 2010

Aquat. Microb. Ecol.

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“…We also do not rule out that other factors could have an influence on the structure of phytoplankton communities of ECS (Jiao et al, 2002(Jiao et al, , 2005Zhu et al, 2009). As suggested by Jiao et al (2002Jiao et al ( , 2005, light and temperature were also controlling factors for Synechococcus in CDW (Jiao et al, 2002(Jiao et al, , 2005.…”

Section: Potential Influences Of the Changjiang Discharge On Ecsmentioning

confidence: 96%

“…As suggested by Jiao et al (2002Jiao et al ( , 2005, light and temperature were also controlling factors for Synechococcus in CDW (Jiao et al, 2002(Jiao et al, , 2005. Further investigations therefore are required to clarify the controlling factors of the phytoplankton community in mid-shelf region of ECS which is influenced by Changjiang freshwater.…”

Section: Potential Influences Of the Changjiang Discharge On Ecsmentioning

confidence: 99%

Influence of the Changjiang River on the light absorption properties of phytoplankton from the East China Sea

et al. 2014

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Abstract. Phytoplankton light absorption properties were investigated at the surface and subsurface chlorophyll a maximum (SCM) layer in the East China Sea (ECS), a marginal sea which is strongly influenced by the Changjiang discharge in summer. Results from ECS were compared with those from the Tsushima Strait (TS) where the influence of Changjiang discharge is less. The probable controlling factors, packaging effect (cell size) and pigment composition of total chlorophyll a (Tchl a)-specific absorption coefficient (a * ph (λ)) were examined by the corresponding measurements of pigments identified by high-performance liquid chromatography. We observed distinct phytoplankton size structure and thereby absorption properties between ECS and TS. At the surface, mixed populations of micro-, nanoand pico-phytoplankton were recorded in ECS while picophytoplankton dominated in TS, generating a lower average a * ph (λ) in ECS than in TS. Within SCM, average a * ph (λ) was higher in ECS than in TS because of the dominance of nano-and micro-phytoplankton in ECS and TS, respectively. By pooling surface and SCM samples, we found regular trends in phytoplankton size-fraction versus Tchl a; and correlations between a * ph (λ) and Tchl a consistent with previous observations for the global ocean in TS but not in ECS. In ECS phytoplankton size-fraction was not correlated with Tchl a, which consequently caused poor relationships between a * ph (λ) and Tchl a. The abnormal values mainly originated from the surface low-salinity waters and SCM waters beneath them. At high Tchl a, a * ph (λ) of these samples was substantially higher compared to the values in TS and from the global regressions, which was attributable to the lower micro-phytoplankton fraction, and higher nano-and/or pico-phytoplankton fractions in ECS. These observations indicated that the distinct light absorption properties of phytoplankton in ECS were possibly influenced by the Changjiang discharge. Our findings imply that general bio-optical algorithms proposed based on the correlations between a * ph (λ) and Tchl a or the patterns in size-fraction versus Tchl a are not applicable in ECS, and need to be carefully considered when using these general algorithms in river-influenced regions.

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“…FC has become a valuable tool for determining the abundance of autotrophic and heterotrophic bacteria rapidly and directly in oceanography (Fuchs et al 2000;Jiao et al 2005;Nelson et al 2011). This method, however, is rarely used in enumerating microorganisms in shallow eutrophic lakes.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of bacterial abundance and the related environmental factors in large shallow eutrophic Lake Taihu

Gong

Tang

Shao

et al. 2016

Journal of Freshwater Ecology

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In aquatic ecosystems, estimation of bacterial abundance (BA) is intimately connected to the development of an understanding of the role of bacteria in microbial food webs. Flow cytometry (FC) can rapidly calculate BA, but to date mostly has been applied in marine waters with limited use in shallow eutrophic lakes because of the abundant organic and inorganic matter. To seek the best compromise between precision and the clarity for the differentiation of bacteria from other submicron-sized particles and colloids in eutrophic lakes, we optimized FC instrument settings, fixatives and storage conditions, ultrasonic pre-treatment and staining protocols. Then, BA in Lake Taihu was investigated by the optimized FC procedures. Regression analysis showed good correspondence (R 2 D 0.72, p < 0.001, n D 128) of BA counted by FC and epifluorescence microscopy. The developed protocol was successfully applied to monitor the dynamics of BA in the large shallow eutrophic Lake Taihu. A distinct spatio-temporal shift of BA in Lake Taihu was observed. The shift was found to be mainly related to dissolved organic carbon, total suspended solids, water temperature and chlorophyll-a. Our results highlight the effect of sediment re-suspension and algal biomass on BA in eutrophic shallow lakes.

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Dynamics of autotrophic picoplankton and heterotrophic bacteria in the East China Sea

Cited by 146 publications

References 42 publications

Distribution of nano-sized Cyanobacteria in the western and central Pacific Ocean

Distribution of nano-sized Cyanobacteria in the western and central Pacific Ocean

Influence of the Changjiang River on the light absorption properties of phytoplankton from the East China Sea

Dynamics of bacterial abundance and the related environmental factors in large shallow eutrophic Lake Taihu

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