 Flowing Water Habitats  Creeks, streams, and rivers  The flow of the water influences the lives of the organisms inhabiting the waters and the physical.

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Presentation transcript:

 Flowing Water Habitats  Creeks, streams, and rivers  The flow of the water influences the lives of the organisms inhabiting the waters and the physical characteristics of the stream.

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 Headwaters: streams that join together and form a river  Near headwaters river usually flow fast and currents are swift  Rocky bottom  Higher levels of D.O. due to flow and temperature of the water.

 Velocity decreases  River gets wider and wider  Meanders become common (curves)  Pools: where water is deeper and slows down, filled with fine sediments  Riffles: faster, shallower with rocky bottom  Run: fast flowing water, deeper water

The meandering Tigre River, Argentina. PHOTOGRAPH REPRODUCED BY PERMISSION OF THE CORBIS CORPORATION Read more: Basins-to-Volcanoes/Stream-and-River.html#ixzz1147UMeyXhttp:// Basins-to-Volcanoes/Stream-and-River.html#ixzz1147UMeyX

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water/Meander_processes.jpg

 Flat stretches of land on either side of a slow moving river  During storms, rivers overflow and flood these areas  When water recedes deposits of rich sediment are left behind ; fertile land

 Less oxygen  Warmer temperature  Communities of catfish, algae, turtles, dragonflies and other organisms that can live in lower DO.

 Usually empties into an ocean or a lake.  Water slows even more  Sediment is deposited and creates new land called a delta.  Where a river meets an ocean, freshwater mixes with salt water, an estuary is formed.  Estuaries are important nurseries for lots of aquatic organisms.

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 In temperate regions, leaves and other plant parts (Coarse particulate organic matter or CPOM) are the main source of energy available to the stream ecosystem. Headwaters: more CPOM Benthic invertebrates: shredders and collectors Fish: trout (colder more oxygenated water)

 Near headwaters: high O 2, colder temperatures, CPOM  Further downstream: lower O 2, warmer temperatures, FPOM  Affects which species flourish in a given area

 Down stream: Fine particulate organic matter (FPOM) washed down from headwaters  Algae (both filamentous and planktonic) and plants are more common because of slower water and more sunlight.  Few shredders, more collectors and grazers.  Fish: Carp and catfish, tolerate lower D.O. and warmer temperatures.