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RIVERINE ECOSYSTEM

RIVERINE ECOSYSTEM. STREAM ORDERS. Gradient. Low-order Steep slope  fast flow  removes sediment  high clarity  exposed rock High-order: Gradual slope  slow flow  settling sediment  low clarity  sand/silt bottom. Temperature. Low-order:

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RIVERINE ECOSYSTEM

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  1. RIVERINE ECOSYSTEM

  2. STREAM ORDERS

  3. Gradient • Low-order • Steep slope  fast flow  removes sediment  high clarity  exposed rock • High-order: • Gradual slope  slow flow  settling sediment  low clarity  sand/silt bottom

  4. Temperature • Low-order: • Narrow width  shaded  cool water  high dissolved O2 • High-order: • Wide width  exposed to sun  warm water  low dissolved O2

  5. Energy Flow • Low-order: • Leaves drop  caught in rocks/roots  provide nutrients for invertebrates (CPOM)

  6. Energy Flow • Mid-order: • CPOM breakdown (FPOM) • Producers • Algae clinging to rocks (periphyton) • Rooted, submergent vegetation

  7. Energy Flow • High-order: • Producers throughout water column • Phytoplankton (free-floating algae)

  8. Low-order Fish • Stream-lined, muscular • High metabolism: • Fatty tissue, high O2 demand • Examples: trout, dace, darter

  9. High-order Fish • Broad bodied • Low-metabolism • low O2 demand • Examples: perch, bass, catfish, carp

  10. Fish • Anadromous Fish • Spends part of life in salt and freshwater • Spawn in Streams (Atlantic Salmon, Herring) • Spawn in Ocean (American Eel)

  11. River Continuum Model

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