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Hirose, Miho; Nishibe, Yuichiro; Ueki, Masaya; Nakano, Susumu

doi:10.1023/a:1022128306570

Cited by 13 publications

(2 citation statements)

References 33 publications

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“…In different pelagic environments, HF abundances vary between 20 and more than 2 9 10 4 cells ml -1 (Boenigk & Arndt, 2002). However, in this study this variation was observed only in the eutrophic-hypertrophic range, and we recorded the highest abundances ever reported in the literature (Hirose et al, 2003;Chen et al, 2010;Fermani et al, 2013). Several studies showed that HF abundances increased along with trophic gradient (Auer & Arndt, 2001;Auer et al, 2004) and that hypertrophic water bodies were dominated by HF [ 10 lm.…”

Section: Microorganisms In Pampean Lakescontrasting

confidence: 53%

“…It is well documented that zooplankton composition could be of significant importance structuring the microbial trophic web (Ju ¨rgens & Matz, 2002;Pernthaler et al, 2004;Sommer & Sommer, 2006). For instance, some authors founded that picoplanktonic abundance could be strongly regulated by predation (top-down control), instead of its resource availability (bottom-up control) (Pernthaler et al, 1996;Hirose et al, 2003;Callieri, 2010). In addition, several authors have suggested that zooplankton exerts a higher control over HF abundances when the trophic status increases, resulting in a higher decoupling between HF and their preys (Gasol, 1994;Pernthaler, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes

et al. 2014

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The aim of this work was to study the components of the microbial food web and the degree of coupling between heterotrophic bacteria (HB) and heterotrophic flagellates (HF) in different shallow lakes of the Pampa Plain over a wide range of water transparency and nutrient levels. We hypothesized that not all microorganisms (i.e., HB, HF) equally increase with nutrient levels, thus, resulting in a weaker degree of coupling between HB and HF in more eutrophic waters. During the spring-summer 2009-2011, we sampled 40 Pampean lakes situated in different watershed of Buenos Aires Province. Abundances of most microbial components were very high, even higher than those reported in the literature. HB as well as picocyanobacteria (Pcy) increases with trophic state, while no clear relationship was found between protist (HF or ciliates) and Chl-a concentrations or nutrient levels. Photosynthetic picoplankton was generally dominated by phycocyanin-rich Pcy. Lakes with high HB and low HF were abundant, which suggest these components were weakly coupled. Based on the abundance of microorganisms, we do not accumulate enough evidence to segregate Pampean lakes into two discrete groups (clear vs turbid).

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Section: Microorganisms In Pampean Lakescontrasting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes

et al. 2014

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The decline process and major pathways of Microcystis bloom in Taihu Lake, China

Wang

et al. 2012

Chin. J. Ocean. Limnol.

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Eutrophication has become a serious concern in many lakes, resulting in cyanobacterial blooms. However, the mechanism and pathways of cyanobacteria decline are less understood. To identify and define the growth and decline of Microcystis blooms in Taihu Lake of China, and to illuminate the destination of surface floating blooms, we investigated the biomass distribution and variations in colony size, morphology, and floating velocity from October 2008 to September 2009. The results showed that the Microcystis bloom declined in response to biomass decrease, colony disaggregation, buoyancy reduction, and increased phytoplankton biodiversity, and these indicative parameters could be applied for recognition of the development phases of the bloom. Three major decline pathways were proposed to describe the bloom decline process, colony disaggregation (Pathway I), colony settlement (Pathway II), and cell lysis in colonies (Pathway III). We proposed a strategy to define the occurrence and decline of Microcystis blooms, to evaluate the survival state under different stress conditions, and to indicate the efficiency of controlling countermeasures against algal blooms.

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Trophic coupling of a testate amoeba and Microcystis species in a hypertrophic pond

et al. 2004

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Seasonal changes in abundance of the testate amoeba Penardochlamys sp. and its food vacuole contents were investigated in relation to blooms of the cyanobacteria Microcystis spp. in a hypertrophic pond from April 1999 to March 2000. The behavior of the amoeba feeding on M. aeruginosa and M. wesenbergii was also observed in the laboratory. The amoeba was detectable from late May to November 1999 during the blooms of Microcystis spp. Cell densities of the amoeba fluctuated between 1.4 and 350 cells ml Ϫ1 with some sporadic peaks, which did not coincide with rapid decreases in the abundance of Microcystis spp. Food vacuoles contained only Microcystis cells; other prey items were not found, suggesting that this amoeba utilized only the cyanobacteria as food. The amoeba was frequently found attached to Microcystis colonies, but was not associated with other suspended particles. Observation of the amoeba feeding revealed the feeding mechanism and that the amoeba was able to graze on both species of Microcystis. These results suggest that the trophic coupling of these organisms is substantial, although grazing by the amoeba is not sufficient to regulate the dynamics of Microcystis populations in this hypertrophic pond.

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Cited by 13 publications

References 33 publications

Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes

Microbial abundance patterns along a transparency gradient suggest a weak coupling between heterotrophic bacteria and flagellates in eutrophic shallow Pampean lakes

The decline process and major pathways of Microcystis bloom in Taihu Lake, China

Trophic coupling of a testate amoeba and Microcystis species in a hypertrophic pond

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