The ecology of flagellated phytoplankton in brown-water lakes

Ilmavirta, Veijo

doi:10.1080/03680770.1983.11897391

Cited by 18 publications

(30 citation statements)

References 3 publications

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“…These groups, which can exhibit phagotrophy, heterotrophy and mixotrophy (Berningeretal., 1992;Bird & Kalff, 1986, and survive low temperatures (Cronberg et al, 1975: Morgan and, were able to outcompete the other algal groups. Their motility also enables them to move fi'eely in the water column and to seek out more favourable light and nutrient conditions (Reynolds, 1976;Ilmavirta, 1983;Salonen et al, 1984). Because of the different patterns of snow accumulation on the two lakes, it is likely the quantity and/or quality of light reaching the water in Opinicon would be different fi'om that in Upper Rock.…”

Section: Biological Variablesmentioning

confidence: 98%

Winter limnology: a comparison of physical, chemical and biological characteristics in two temperate lakes during ice cover

Agbeti

Smol

1995

Hydrobiologia

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The winter dynamics of several chemical, physical, and biological variables of a shallow, polymictic lake (Opinicon) are compared to those of a deep, nearby dimictic lake (Upper Rock) during ice cover (January to early April) in 1990 and 1991. Both lakes were weakly inversely thermally stratified. Dissolved oxygen concentration was at saturation (11-15 mg 1 -~) in the top 3 m layer, but declined to near anoxic levels near the sediments. Dissolved oxygen concentrations in the deep lake were at saturation in most of the water column and approached anoxic levels near the sediments only. Nutrient concentrations in both lakes were fairly high, and similar in both lakes during ice cover. Total phosphorus concentrations generally ranged between 10-20 #g I -I , NH4-N between 16-100/zg 1 -~ , and DSi between 0.9-1.9 mg 1-~; these concentrations fell within summer ranges. NO3-N concentrations were between 51 -135 Ft, g 1-1 during ice cover, but occurred at trace concentrations (<0.002 ltg I-l ) during the summer. The winter phytoplankton community of both lakes was dominated by flagellates (cryptophytes, chrysophytes) and occasionally diatoms. Dinoflagellates, Cyanobacteria and green algae were poorly represented. Cryptophytes often occurred in fairly high proportions (20-80%) throughout the water column, whereas chrysophytes were more abundant just beneath the ice. Zooplankton population densities were extremely low during ice cover (compared to maximum densities measured in spring or summer) in both lakes, and were comprised largely of copepods.

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Section: Biological Variablesmentioning

confidence: 98%

Winter limnology: a comparison of physical, chemical and biological characteristics in two temperate lakes during ice cover

Agbeti

Smol

1995

Hydrobiologia

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“…There has always been some puzzlement over the presence of healthy, growing phytoplankton below the euphotic zone as determined by 14C production (Schindler and Holmgren 197 1). In humic lakes and in oligotrophic lakes where the euphotic zone extends into the hypolimnion, highly concentrated populations of chrysophycean cells often accumulate (Fee et al 1977;Ilmavirta 1983). For example, a dense peak of algae developed in the hypolimnion of Lake 302N of the Experimental Lakes Area (ELA), Ontario, in summer 1974 (Fee 1976).…”

Section: Discussionmentioning

confidence: 99%

Algal phagotrophy: Regulating factors and importance relative to photosynthesis in Dinobryon (Chrysophyceae)1

Bird

Kalff

1987

Limnology & Oceanography

193

119

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Simultaneous measurements of inorganic carbon fixation and phagotrophic particle uptake by Dinobryon in a metalimnetic algal abundance peak showed that this alga depended more strongly on ingested bacteria for nutrition than on photosynthesis. Measurements of the grazing rate at different depths in Lac Gilbert, Quebec, showed that the particle ingestion rate depends on water temperature rather than light availability. Phagocytosis of bacteria proceeded at a similar rate both day and night in most lakes where Dinobryon was found. Since other chrysomonad genera (Chlsophaerella, Uroglena, Catenochrysis, Ochromonas, Chromulina, and Chrysococcus) were also found to ingest particles, it will not be possible to estimate grazing on bacteria by counting nonpigmented cells and ignoring those containing chlorophyll. In oligotrophic Lac Bowker, 30% of the phytoplankton cells were actively ingesting small particles, and it was these phytoplankton and not the less numerous zooplankton that were responsible for most bacterial grazing in the lake. Phagotrophy by algae appears to be an important but unexpected pathway for energy flow in lakes.

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“…The ecological success of such algae under the restricting circumstances of polyhumic lakes is discussed by Ilmavirta (1984), Salonen (1984) and Arvola (1985). One strategy is vertical migration and it appears that this is adopted by Mallomonopsis tasmanica in our lakes (Croome & Tyler, 1983a).…”

Section: Resultsmentioning

confidence: 99%

Taxonomy and ecology of the phytoplankton of Lake Fidler and Sulphide Pool, meromictic Tasmanian lakes

Croome

Tyler

1986

Hydrobiologia

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A floristic list of 89 freshwater phytoplanktonic algae occurring in two neighbouring, dystrophic, meromictic Tasmanian lakes is given. In both lakes the preponderance of desmids and phytoflagellates, especially chrysophytes, is a characteristic in keeping with their dystrophic nature. All the alga must be adapted to low levels of red light and some habitually inhabit crepuscular depths rather than executing die1 vertical migrations such as happens in many dystrophic waters. Floristic differences between the two lakes are related to morphometric differences and the degree of entrainment of tychoplankton. The photosynthetic biomass of both lakes is predominantly monimolimnetic, made up of few species. The floristically-rich mixolimnion contributes little to biomass. The ecology of the dystrophic flora is discussed in relation to the special circumstances of meromixis.introduction

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The ecology of flagellated phytoplankton in brown-water lakes

Cited by 18 publications

References 3 publications

Winter limnology: a comparison of physical, chemical and biological characteristics in two temperate lakes during ice cover

Winter limnology: a comparison of physical, chemical and biological characteristics in two temperate lakes during ice cover

Algal phagotrophy: Regulating factors and importance relative to photosynthesis in Dinobryon (Chrysophyceae)1

Taxonomy and ecology of the phytoplankton of Lake Fidler and Sulphide Pool, meromictic Tasmanian lakes

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