structure of aquatic ecosystems. relative importance of allochthonous versus autochthonous sources...
TRANSCRIPT
![Page 1: Structure of Aquatic Ecosystems. Relative importance of allochthonous versus autochthonous sources of nutrients sediments organic matter (dissolved and](https://reader036.vdocuments.mx/reader036/viewer/2022062308/56649dc75503460f94abc5ba/html5/thumbnails/1.jpg)
Structure of Aquatic Ecosystems
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Relative importance of allochthonous versus autochthonous sources of
• nutrients• sediments• organic matter (dissolved and particulate)
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Productivity within a Watershed
• Wetland very productive• Terrestrial systems moderately productive• Aquatic systems least productive
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Zones of a Lake
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Zones of a Reservoir
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Zonation of Littoral Vegetation
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Aufwuchs
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Categories of Aufwuchs
• Epiphytic • Epipelic
• Episammic
• Epilithic
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Phytoplankton
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Zooplankton
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Benthos
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Nekton
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Trophic Structure
Primary Producers
Primary Consumers
Secondary Consumers (carnivores)
Decomposers
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Food Web
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River Continuum
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Productivity
Rate at which energy enters one trophic level from a lower trophic level.
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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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Diversity
Complexity of a community
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Relative Sizes
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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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Production
• New organic mass per unit of time
• Σ [new organic biomass - respiration -excretion - secretion – injury – death – grazing]
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Energy Flow in an Ecosystem
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