Slide #1.

Structure of Aquatic Ecosystems
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Slide #2.

Relative importance of allochthonous versus autochthonous sources of • nutrients • sediments • organic matter (dissolved and particulate)
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Slide #3.

Productivity within a Watershed • Wetland very productive • Terrestrial systems moderately productive • Aquatic systems least productive
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Slide #4.

Zones of a Lake
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Slide #6.

Zones of a Reservoir
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Slide #7.

Zonation of Littoral Vegetation
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Slide #8.

Aufwuchs
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Slide #9.

Categories of Aufwuchs • Epiphytic • Epipelic • Episammic • Epilithic
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Slide #10.

Phytoplankton
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Slide #11.

Zooplankton
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Slide #12.

Benthos
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Slide #13.

Nekton
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Slide #14.

Trophic Structure Primary Producers Primary Consumers Secondary Consumers (carnivores) Decomposers
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Slide #15.

Food Web
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Slide #16.

River Continuum
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Slide #17.

Productivity Rate at which energy enters one trophic level from a lower trophic level.
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Slide #18.

Efficiency Energy transfers not very efficient because of dissipation through metabolism, etc. Also, mechanisms of energy transfer not inherently efficient. For example photosynthesis is less than 1% efficient in water.
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Slide #19.

Diversity Complexity of a community
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Slide #20.

Relative Sizes
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Slide #21.

Biomass Ways to determine: • Volume and number • Weight –fresh and dry • Oxidize living matter to CO2 • Total ATP • For primary producers, extract chlorophylls
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Slide #22.

Production • New organic mass per unit of time • Σ [new organic biomass respiration -excretion - secretion – injury – death – grazing]
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Slide #23.

Energy Flow in an Ecosystem
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