Ecosystem Processes and the River Continuum Concept . Unit 1: Module 4, Lecture 5. Objectives. Students will be able to: classify sources of organic matter. diagram the flow of instream organic matter. factors that influence the storage of organic matter in streams.
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Unit 1: Module 4, Lecture 5
Students will be able to:
Soluble organic compounds that leach from leaves, roots, decaying organisms, and other sources
Largest pool of organic matter in streams
Particulate organic matter
Coarse particulate organic matter
Woody material & leaves > 1 mm
Fine particulate organic matter
Leaf fragments, invertebrate feces, and organic precipitates < 1 mmTypes of organic matter
Microbes, macro-invertebrates, fish, and other organisms all play roles in the physical and chemical processing of organic matter.Instream organic matter processing
The River Continuum - www.oaa.pdx.edu/CAE/Programs/ sti/pratt/energy.html
A caddisfly of the family HydroptilidaeMacroinvertebrate functional roles
A “true bug” of the family NotonectidaeMacroinvertebrate functional roles
Stored within the stream bank or channel (25%)
Exported downstream (50%)
Metabolized and respired as carbon dioxide by organisms (25%)
Photo – g. merrickFate of organic matter
In the this small, forested headwater stream it was found that greater than 99% of the carbon input to Bear Brook came from allochthonous sources (POM slightly greater than DOM).
Close to 65% of this input was exported downstream from the 1700 meter long study site.
Input of DOM exceeded exports
Due to leaf fall more POM was exported than entered the siteBear Brook, New Hampshire