For a complete picture of the lake ecosystem, it is necessary to understand the mechanisms regulating biomass and nutrient status (nutrient limitation, optimal supply, or surplus) of benthic algae, which are important primary producers and a food resource for grazers. This thesis gives an overview of the natural variation of benthic algae at different scales of space and time and on different substrates, and unravels some of the underlying factors. Algal nutrient status was assessed using the C:N:P (carbon:nitrogen:phosphorus) ratio of the entire natural benthic community…
Contents
1 INTRODUCTION
2 HYPOTHESES
3 STUDY SITES
4 APPROACHES
4.1 FIELD SAMPLING AND EXPERIMENTS
4.2 ESTIMATION OF BIOMASS
4.3 ESTIMATION OF NUTRIENT STATUS
5 THE VARIATION OF BIOMASS AND NUTRIENT STATUS
5.1 VARIATION WITH DISTANCE, DEPTH, AND TIME ON STONES AND ROCKS IN LAKE ERKEN
5.2 SIMILAR HORIZONTAL VARIATION FOR DIFFERENT SUBSTRATES AND LAKES
5.3 CALCULATION OF AN OPTIMAL SAMPLING DESIGN
6 FACTORS REGULATING BENTHIC ALGAL BIOMASS AND NUTRIENT STATUS
6.1 INFERENCES FROM FIELD OBSERVATIONS
6.2 EXPERIMENTAL TEST OF BOTTOM-UP VERSUS TOP-DOWN EFFECTS
6.3 ANIMALS IMPROVE THE NUTRIENT STATUS OF BENTHIC ALGAE
7 CONCLUSIONS
8 FUTURE OUTLOOK
9 (GERMAN SUMMARY)
10 ACKNOWLEDGEMENTS
11 REFERENCES
Author: Kahlert, Maria
Source: Uppsala University Library
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