Succession of phytoplankton in a deep stratifying lake: Mondsee, Austria

Dokulil, Martin T.; Skolaut, Claudia

doi:10.1007/978-94-009-4818-1_2

Cited by 18 publications

(10 citation statements)

References 17 publications

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“…In some pre-alpine lakes, Dinobryon regularly occurs in late summer when seston stoichiometry suggests strong nutrient limitation (Dokulil & Skolaut 1986, Sommer 1987. These patterns of occurrence may largely be due to the ability of some of these organisms to take up bacterial nutrients and to use them for their own photosynthetic growth.…”

Section: Discussionmentioning

confidence: 99%

Nutrient turnover by freshwater bacterivorous flagellates: differences between a heterotrophic and a mixotrophic chrysophyte

Rothhaupt

1997

Aquat. Microb. Ecol.

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ABSTRACT. The patterns of nutrient turnover by the freshwater bacterivorous chrysophycean flagellates Ochromonas sp. and Spurnella sp, were compared in laboratory experiments. The exclusive phagotroph Spumella sp. released soluble reactive phosphorus (SRP) and ammonium when feeding on bacteria and stimulated the growth of P-limited algae, obv~ously by making phosphorus available to them. The mixotroph Ochromonas sp. released SRP and ammonium in the dark or at high bacterial densities in the light when phagotrophic nutrition prevailed, but it took up mineral nutrients when it grew primarily phototrophically. In P-limited situations, it retained bacterial P for its own photosynthetic growth and did not stimulate other phytoplankton. The results suggest basic differences in the patterns of nutrient turnover by mixotrophs and by exclusive phagotrophs.

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Section: Discussionmentioning

confidence: 99%

Nutrient turnover by freshwater bacterivorous flagellates: differences between a heterotrophic and a mixotrophic chrysophyte

Rothhaupt

1997

Aquat. Microb. Ecol.

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“…Seasonal variability in APP abundance was characterized for a 2 yr period (from January 2000 to December 2001) by fortnightly sampling conducted between 09:00 and 10:00 h (local time) at the deepest location of oligo-mesotrophic, prealpine Lake Mondsee (47°48' N, 13°22' E; area = 14.2 km 2 ; maximum depth = 68 m). Details on the morphometry, hydrology and eutrophication history of Lake Mondsee are given in Jagsch (1982), Dokulil & Jäger (1985), Dokulil & Skolaut (1986) and Klee & Schmidt (1987).…”

Section: Methodsmentioning

confidence: 99%

Flow-cytometric mapping provides novel insights into the seasonal and vertical distributions of freshwater autotrophic picoplankton

Crosbie

Teubner²,

Weisse³

2003

Aquat. Microb. Ecol.

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This is the first study using flow cytometry to characterize the population dynamics of freshwater autotrophic picoplankton (APP) over a full seasonal cycle, the goal of which was to accurately quantify and qualify the natural APP populations in relation to major environmental parameters. In particular, we wanted to test current assumptions about the seasonal succession of prokaryotic and eukaryotic picoplankton cells, including the relationship between solitary picocyanobacteria and microcolonies. Using flow cytometry, we were able to efficiently characterize the abundances of 4 lake APP assemblages in Lake Mondsee, including that of a solitary picocyanobacterial population exhibiting high 'side scatter' values. Such cells were not readily enumerated by epifluorescence microscopy. Unlike Lakes Constance and Maggiore, we found no evidence of a spring peak in solitary picocyanobacteria -we propose that the lack of a spring peak in Lake Mondsee was due to weak stratification in March-April and relatively deep vertical mixing. Since summer declines in the abundance of solitary picocyanobacteria were associated with extended periods of reduced light availability, it is likely that such declines were in part due to low relative growth rates. Finally, we argue that the formation of microcolonies by picocyanobacteria is unlikely to be a strategy for more efficient nutrient recycling (e.g. Stockner & Antia 1986). Rather, we suggest that microcolonies reach high concentrations in surface and near-surface waters due to the production of a photosynthate-rich mucilage resulting from active photosynthesis during periods of severe nutrient deficiency.

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“…Lake Mondsee is an example of an originally ice-covered temperate lake undergoing a transition from a dimictic to a monomictic mixing pattern in the course of the ongoing lake warming (Ficker et al, 2017). Lake Mondsee is one of the best studied lakes in Austria with long-term phytoplankton datasets from the last 40 years (Findenegg, 1969;Dokulil & Skolaut, 1986;Dokulil & Jagsch, 1992;Greisberger et al, 2008;Dokulil & Teubner, 2012). Even longer records ([ 50 years) are available for some abiotic parameters such as Secchi depth .…”

Section: Study Sitementioning

confidence: 99%

Do current European lake monitoring programmes reliably estimate phytoplankton community changes?

Bergkemper

Weisse

2017

Hydrobiologia

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Many European lakes are monitored according to the EU Water Framework Directive (WFD), with focus on phytoplankton biomass and species composition. However, the low-frequency WFD monitoring may miss short-term phytoplankton changes. This is an important issue because short-term extreme meteorological events (heat waves and heavy rain) are predicted to increase in frequency and intensity with climate change. We used records from Lake Mondsee (Austria) from 2009 to 2015 to test if a reduction from monthly to seasonal sampling affected the average annual phytoplankton biovolume. Furthermore, we combined inverted light microscopy, FlowCAM and flow cytometry to estimate the effect of sampling during extreme events on average phytoplankton biovolume. Relative to monthly sampling, seasonal sampling significantly overestimated phytoplankton biomass. A heat wave in 2015 and two episodes of heavy rain in 2015 and 2016 caused species-specific changes; biovolumes of chlorophytes and the filamentous cyanobacterium Planktothrix rubescens (De Candolle ex Gomont) Anagnostidis & Komárek increased significantly during the heat wave. Using live material with FlowCAM and flow cytometry, we detected small and fragile cells and colonies that were either ignored or underrepresented by analysing fixed samples with light microscopy. We suggest a modified sampling and analysis strategy to capture short-term changes within the phytoplankton community.

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Succession of phytoplankton in a deep stratifying lake: Mondsee, Austria

Cited by 18 publications

References 17 publications

Nutrient turnover by freshwater bacterivorous flagellates: differences between a heterotrophic and a mixotrophic chrysophyte

Nutrient turnover by freshwater bacterivorous flagellates: differences between a heterotrophic and a mixotrophic chrysophyte

Flow-cytometric mapping provides novel insights into the seasonal and vertical distributions of freshwater autotrophic picoplankton

Do current European lake monitoring programmes reliably estimate phytoplankton community changes?

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