THE LITTORAL ZONE
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Transcript of THE LITTORAL ZONE
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THE LITTORAL ZONE
ALGAE AND ZOOPLANKTON
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Attached algal habitats in a generalized river ecosystem
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Algae and bacteria on a sand grain
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Diagram of an epiphyte biofilm and nutrient flow within the community
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SEM micrographs of periphyton biofilms on Chara
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Model of a periphyton community showing
relationships between algae and bacteria
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Intact biofilm
showing clusters of algae and bacteria
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Model of interactions
between phytoplankton/
bacterioplankton and epiphytic algae
& bacteria
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Comparison between
periphyton habitats
relative to surface
areas for attachment
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Variations in particle size around an obstacle in a stream
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As periphyton communities
develop, nutrient demand
increases but diffusion
rates from the water
decreases
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Seasonal variation in epipelic diatoms and cyanobacteria in two English lakes
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Seasonal carbon content of epiphytes on Scirpus subterminalis in Lawrence Lake
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Generalized relationship between submerged macrophytes and periphyton
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Interactions between the littoral zone and open water in lakes
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Spatial variations in periphyton
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Primary production of periphyton and phytoplankton
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Epipelic algal production in Marion Lake, BC
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Periphyton production on emergent and submerged epiphytes
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Model of macrophyte, periphyton, and phytoplankton production in a lake
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Number of littoral-dominated versus pelagic-dominated lakes on earth
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Chydorids in beds of Scirpus subterminalis
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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