The hypolimnetic protozoan plankton of a eutrophic lake

Laybourn‐Parry, Johanna; Olver, Judith; Rees, Sian

doi:10.1007/bf00005619

Cited by 25 publications

(12 citation statements)

References 22 publications

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“…This community was supported by high bacterial numbers which reflected the high inorganic nutrient level of this pond [28,35]. The reported numbers are in the upper range of data previously published for this habitat [3,4,36,37].…”

Section: Production Of Hypolimnetic Ciliate Populationssupporting

confidence: 52%

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Seasonal development of hypolimnetic ciliate communities in a eutrophic pond

Guhl

Finlay

Schink

1994

FEMS Microbiology Ecology

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Abstract." The ciliated protozoan communities in the hypolimnion of a highly productive pond were investigated over two years. Three physiological groups could be distinguished: (a) microaerobic ciliates which tracked the oxic-anoxic boundary within the stratified water column; (b) anaerobic ciliates with endosymbiotic methanogens; and (c) anaerobes without endosymbiotic methanogens. Both groups of anaerobes were confined to the anoxic zone of the hypolimnion. Community biomass was dominated by microaerobic ciliates which had on average 20 times larger cells than anaerobic ciliates. Abundance and biomass of microaerobic ciliates decreased over the summer, while anaerobic ciliates increased. This reflected a spatial shift in the availability of inorganic nutrients and, as a result, of ciliate food from the epi-and metalimnion to the hypolimnion. The low biomass production of anaerobic ciliates was consistent with the low theoretical growth efficiency of anaerobic metabolism. Ciliate species displayed characteristic spatial and seasonal distribution patterns within the water column which were similar in both years investigated. Spatial and temporal distribution was mainly governed by two factors: (1) the distribution of dissolved oxygen; and (2) the availability of food. Distribution patterns were not related to chemical gradients other than the oxygen gradient, but they were correlated with the distribution of major food sources.

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Section: Production Of Hypolimnetic Ciliate Populationssupporting

confidence: 52%

“…The hypolimnia of productive lakes harbour diverse protozoan communities with a characteristic species composition [1][2][3][4]. If anoxic conditions develop, protozoa become the principal or 294 obic metabolism leads to short food chains [5].…”

Section: Introductionmentioning

confidence: 99%

Seasonal development of hypolimnetic ciliate communities in a eutrophic pond

Guhl

Finlay

Schink

1994

FEMS Microbiology Ecology

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“…Moreover, it appears that the ciliate populations in this region do not seem to migrate. The above findings on the distribution of anaerobic ciliate communities in Lake Shunet are similar to those described for freshwater stratified reservoirs and marine systems all over the world (Fenchel et al 1990;Laybourn-Parry et al 1990;Zubkov et al 1992). Both availability of food sources and physicochemical gradients of the water bodies seem to play an important role.…”

Section: Ciliatessupporting

confidence: 73%

“…Guhl et al (1996) showed that although the ciliate communities in three stratified lakes they studied differed in their species compositions, they had similar structure of vertical distribution of ciliates in pelagic zone. These and a number of other studies (Fenchel et al 1990;Laybourn-Parry et al 1990;Zubkov et al 1992;Guhl et al 1994) suggest that the vertical distribution patterns of ciliates are an evidence of the almost steady-state conditions prevailing in the anoxic hypolimnia and that changes in these patterns follow changes in the conditions in the aquatic ecosystem.…”

Section: Ciliatesmentioning

confidence: 84%

Densities and distribution of flagellates and ciliates in the chemocline of saline, meromictic Lake Shunet (Siberia, Russia)

2010

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The vertical and seasonal distributions of the phytoflagellate Cryptomonas spp., and its most common, the planktonic ciliate predators (Oligotrichida, Scuticociliatida, Hypotrichida and Prostomatida) were investigated in chemocline region of small saline, meromictic lake Shunet (Siberia, Russia) during 2003 and 2005. The lake has a pronounced chemocline, with abundance of purple and green sulphur bacteria. Vertical distribution of the Cryptomonas populations near the oxic/anoxic boundary layer was studied at close intervals in water sampled using a hydraulically operated thin-layer sampler. In both summer and winter, Cryptomonas peaked in water stratum 5-10 cm above anoxic zone or in the anoxic zone water column in the chemocline (about 5 m). Ciliate densities and biomass were also much higher in chemocline than in mixolimnion. The range of diurnal migration of Cryptomonas population was not very wide, and it was restricted to layers with high light intensity. The ciliates were sometimes detected above the upper border of the anoxic zone but also several centimetres below this zone.

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“…It is likely that it cannot withstand the presence of oxygen for long (Fenchel et al 1977;Dyer 1989). Though it did not invade the entire water column, Laybourn-Parry et al (1990) found an anaerobic Plagiopyla species in the plankton below the oxycline in a small eutrophic lake and concluded that it was a migrant from the benthos. Dolan and Coats (1991) studied ciliates during a severe hypoxia event in Chesapeake Bay and found large trachlocercid ciliates, more typically seen in anoxic sediments, to be dominant zooplankters in bottom waters below 8-10 m. They speculated that these benthic ciliates colonized the waters overlying the sediments when low oxygen concentrations favored them.…”

Section: Anaerobic Ciliatesmentioning

confidence: 99%