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THE LITTORAL ZONE . ALGAE AND ZOOPLANKTON. Attached algal habitats in a generalized river ecosystem. Algae and bacteria on a sand grain. Diagram of an epiphyte biofilm and nutrient flow within the community. SEM micrographs of periphyton biofilms on Chara. - PowerPoint PPT Presentation
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THE LITTORAL ZONE
ALGAE AND ZOOPLANKTON
Attached algal habitats in a generalized river ecosystem
Algae and bacteria on a sand grain
Diagram of an epiphyte biofilm and nutrient flow within the community
SEM micrographs of periphyton biofilms on Chara
Model of a periphyton community showing
relationships between algae and bacteria
Intact biofilm
showing clusters of algae and bacteria
Model of interactions
between phytoplankton/
bacterioplankton and epiphytic algae
& bacteria
Comparison between
periphyton habitats
relative to surface
areas for attachment
Variations in particle size around an obstacle in a stream
As periphyton communities
develop, nutrient demand
increases but diffusion
rates from the water
decreases
Seasonal variation in epipelic diatoms and cyanobacteria in two English lakes
Seasonal carbon content of epiphytes on Scirpus subterminalis in Lawrence Lake
Generalized relationship between submerged macrophytes and periphyton
Interactions between the littoral zone and open water in lakes
Spatial variations in periphyton
Primary production of periphyton and phytoplankton
Epipelic algal production in Marion Lake, BC
Periphyton production on emergent and submerged epiphytes
Model of macrophyte, periphyton, and phytoplankton production in a lake
Number of littoral-dominated versus pelagic-dominated lakes on earth
Chydorids in beds of Scirpus subterminalis
Wetzel’s SummaryRIVERS RESERVOIRS LAKES WETLANDS
Periphyton diversity
Low (channel)Moderate (wetlands)
Low Low in epilithic algaeHigh in epiphytic algae
Very high
Periphyton biomass and production
Low in-channelModerate to high in wetlands and backwaters
Low High to very high
Very high
Herbivory pressures on periphyton
Moderate to high
Low Low to moderate
Low
Littoral zooplankton
Low Very low High Relatively low