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 Lotic Ecosystems httpwwwscienceclarifiedcomlandformsimagesueol03img0108jpg ID: 304414
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Flowing Water HabitatsCreeks, streams, and riversThe flow of the water influences the lives of the organisms inhabiting the waters and the physical characteristics of the stream.
Lotic
EcosystemsSlide2
http://www.scienceclarified.com/landforms/images/ueol_03_img0108.jpgSlide3
Headwaters: streams that join together and form a riverNear headwaters river usually flow fast and currents are swiftRocky bottomHigher levels of D.O. due to flow and temperature of the water.
How a Stream/ River BeginsSlide4
Velocity decreasesRiver gets wider and widerMeanders 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
Middle of a RiverSlide5
How a Meander FormsSlide6
The meandering Tigre River, Argentina
.
PHOTOGRAPH REPRODUCED BY PERMISSION OF THE
CORBIS CORPORATION
Read more:
http://www.scienceclarified.com/landforms/Ocean-Basins-to-Volcanoes/Stream-and-River.html#ixzz1147UMeyXSlide7
http://www.geographyhigh.connectfree.co.uk/s3riversgeoghigh26f.gifSlide8
http://belmont.sd62.bc.ca/teacher/geology12/photos/erosion-water/Meander_processes.jpgSlide9
Flat stretches of land on either side of a slow moving riverDuring storms, rivers overflow and flood these areasWhen water recedes deposits of rich sediment are left behind ; fertile land
Flood PlainsSlide10
Less oxygenWarmer temperatureCommunities of catfish, algae, turtles, dragonflies and other organisms that can live in lower DO.
Slower WaterSlide11
Usually empties into an ocean or a lake.Water slows even moreSediment 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
.
MouthSlide12Slide13
http://farm3.static.flickr.com/2117/2279411722_17c2675fb1.jpgSlide14
Lotic EcologyIn 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)Slide15
Near headwaters: high O2, colder temperatures, CPOMFurther downstream: lower O2, warmer temperatures, FPOM
Affects which species flourish in a given area
Lotic EcologySlide16
Lotic Ecology: headwatersSlide17
Down stream: Fine particulate organic matter (FPOM) washed down from headwatersAlgae (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. Slide18
Lotic EcologySlide19
Lotic Ecology: downstream