Light and electron microscope observations and prey specificities of an algophorous amoeba from Japanese freshwater.

Yamamoto, Yoko; Suzuki, Kenji

doi:10.2323/jgam.30.411

Cited by 16 publications

(10 citation statements)

References 7 publications

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“…Whitton (1973) briefly noted that a small, naked amoeba found in the mucilaginous mass of the cyanobacterium grazed on Microcystis spp. Also, Yamamoto (1981) and Yamamoto and Suzuki (1984) found that the naked amoeba Nuclearia sp. could feed on M. aeruginosa, M. elabens, and M. flos-aquae in the laboratory.…”

Section: Discussionmentioning

confidence: 97%

“…Previous laboratory studies reported that some rhizopods have a wide prey range within cyanobacterial species (Ho and Alexander 1974;Yamamoto and Suzuki 1984;Laybourn-Parry et al 1987). In spring, prior to the blooming of Microcystis, other cyanobacteria such as Phormidium mucicola and Anabaena sp.…”

Section: Discussionmentioning

confidence: 99%

“…There are some reports of rhizopods grazing on Microcystis in laboratory experiments (Yamamoto 1981;Yamamoto and Suzuki 1984) and field observation (Whitton 1973), but little is known about the seasonal abundance of any particular species of rhizopod that is capable of grazing on Microcystis. Furthermore, information about the feeding habits of these rhizopods, an important aspect for understanding their trophic roles in natural environments, is quite limited.…”

Section: Introductionmentioning

confidence: 96%

“…Rhizopods, consisting of naked and testate amoebae, common members of the protistan community in aquatic habitats (Caron and Swanberg 1990;Arndt 1993;Muylaert et al 2000;Song 2000), have long been known as consumers of cyanobacteria (reviewed by Dryden and Wright 1987). Previous laboratory studies have demonstrated that some rhizopod species are very active grazers with a strong tendency to select specific prey, particularly cyanobacteria (Ho and Alexander 1974;Wright et al 1981;Huang and Wu 1982;Yamamoto and Suzuki 1984;Daft et al 1985;Becares and Romo 1994). This evidence suggests that rhizopod grazing can have a significant impact on the dynamics of natural cyanobacterial populations.…”

Section: Introductionmentioning

confidence: 97%

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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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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

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

et al. 2004

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“…Among such protistan grazers, rhizopods, including both naked and testate amoebae, are frequently found to be abundant when significant decreases in Microcystis abundance are detected in lakes, and grazing on Microcystis by some rhizopod species has been demonstrated in laboratory experiments (Yamamoto 1981;Yamamoto and Suzuki 1984;Nishibe et al 2004) and field observations (Whitton 1973;Nishibe et al 2004). Unfortunately, we still have limited eco-physiological information about the rhizopods that graze on Microcystis.…”

Section: Introductionmentioning

confidence: 96%

Grazing on Microcystis (Cyanophyceae) by testate amoebae with special reference to cyanobacterial abundance and physiological state

et al. 2010

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We examined the growth of testate amoebae preying on Microcystis whose physiological states were different in laboratory experiments and a hypertrophic pond. We prepared three experimental systems using water samples dominated by Microcystis aeruginosa: light incubation (control), dark incubation (dark), and light incubation with addition of nitrogen and phosphorus (?NP). In all the systems, the colony density of M. aeruginosa decreased slightly during incubation. Physiological activity of phytoplankton as determined by chlorophyll fluorescence was high and almost constant in the control and ?NP systems, whereas it decreased in the dark system. Cell densities of testate amoebae increased in the control and ?NP systems, whereas in the dark system they remained low. Thus, growth of the amoebae was low in the systems where physiological activity of Microcystis was low. In a hypertrophic pond, cell density of testate amoebae increased and remained high when M. aeruginosa predominated. Cell density of testate amoebae increased remarkably, simultaneously with the increases in M. aeruginosa colony density and phytoplankton physiological activity. We also found a significant correlation between densities of M. aeruginosa colonies and testate amoebae. We suggested that the physiological activity of Microcystis is one important factor affecting the growth of testate amoebae grazing on Microcystis.

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Grazing impact on the cyanobacterium Microcystis aeruginosa by the heterotrophic flagellate Collodictyon triciliatum in an experimental pond

et al. 2012

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We estimated the grazing impact of the heterotrophic flagellate Collodictyon triciliatum on the harmful, bloom-forming cyanobacterium Microcystis aeruginosa in an experimental pond during Microcystis bloom from summer to winter in 2010. For these experiments, we calculated the grazing rates from the C. triciliatum digestion rate and food vacuole content. During the study period, M. aeruginosa exhibited one blooming event with a maximum density of 1.1×10 5 cells ml-1. The cell density of C. triciliatum fluctuated from below the detection limit to 291 cells ml-1. The number of M. aeruginosa cells ingested by C. triciliatum food vacuoles ranged between 0.4 and 10.8 cells flagellate-1 , and the digestion rate of C. triciliatum at 25°C was 0.73% cell contents min-1. The grazing rate of C. triciliatum on M. aeruginosa prey was 0.2-6.9 cells flagellate-1 h-1 , and its grazing impact was 0.0-25.3% standing stock day-1. The functional response of C. triciliatum to M. aeruginosa prey followed the Michaelis-Menten model of significance (r 2 = 0.873, p < 0.001) in our experimental systems in which the prey concentration varied from 1.0×10 4 to 2.1×10 6 cells ml-1. The maximum grazing rate was 6.2 prey cells grazer-1 h-1 , and the half-saturation constant was 1.2×10 5 cells ml-1. We present evidence that C. triciliatum grazing explained the remarkable decrease in M. aeruginosa cell density in the pond. The present study is the 3 first demonstration of the high potential of protistan grazing on M. aeruginosa to reduce cyanobacterial blooms.

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Light and electron microscope observations and prey specificities of an algophorous amoeba from Japanese freshwater.

Cited by 16 publications

References 7 publications

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

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

Grazing on Microcystis (Cyanophyceae) by testate amoebae with special reference to cyanobacterial abundance and physiological state

Grazing impact on the cyanobacterium Microcystis aeruginosa by the heterotrophic flagellate Collodictyon triciliatum in an experimental pond

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