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Great Ideas in Riverine Ecology

Great Ideas in Riverine Ecology. Linear to Landscapes FISH 7380; Dr. E. Irwin. Systems created by water running downhill depend on:. Geology and climate (present and historical). 1) stream classification 2) longitudinal processes. 3) Riparian-river interactions. Land use.

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Great Ideas in Riverine Ecology

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  1. Great Ideas in Riverine Ecology Linear to Landscapes FISH 7380; Dr. E. Irwin

  2. Systems created by water running downhill depend on: Geology and climate (present and historical) 1) stream classification 2) longitudinal processes 3) Riparian-river interactions Land use River Morphology Hydrology Sediment transport Nutrient/elemental availability Basin flora and fauna Terrestrial communities biota heterotrophy Carbon/solar input Trophic structure Habitat structure Patterns of flows = community function 4) spiraling and retention 5) connectedness 6) biotic/abiotic controls Human interference

  3. Classification • Streams can be classified • Allows managers and scientists to organize river systems • Conceptual and regional approaches • Climate and geology, but vegetation important also • NA-Ecosystem approach (broad scale) • Climate, physiography and vegetation

  4. Hierarchical classification • Spatially nested levels of resolution • Problem—relatively distinct boundaries

  5. Stream Order • Strahler (1952) and modified by Horton (1945) • Variation from headwaters to mouth • Ordering gives a measure of position • Others-link magnitude, d-link

  6. Longitudinal Zonation

  7. River Continuum Concept • Downstream transfers of energy and matter • Invertebrate functional groups • US—DS in lowland rivers=lateral exchanges and vertical fluxes

  8. River-Riparian Interactions • Allochtonous inputs, LWD • Flood-pulse concept • Annual floods drive organic matter and nutrient input in large floodplain rivers.

  9. Lateral and vertical bounds revisited

  10. Longitudinal, lateral and vertical fluxes

  11. Spiraling and Retention

  12. Connectedness

  13. Abiotic and Biotic Control • Disturbance • Other abiotic controls • Biotic? • Limiting resources

  14. Disturbance-structures stream communities • High/low flows • Especially in headwaters

  15. Pressure Points • Interference: how management can mess things up. • Discontinuity- • Serial • Faunal

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