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Common Freshwater Microbes & Tardigrades (Water Bears)

Common Freshwater Microbes & Tardigrades (Water Bears)
Product Description
This video was originally going to be about the moss life cycle, then branched into including tardigrades ("Water Bears"). However, the subject of life in ponds and other fresh water at the microscopic level opened up more variety of creatures that students should be able to appreciate and perhaps even collect view in the lab. Most YouTube clips present the organisms either split up by type, or as part of long documentaries. This is a more concise collection I hope will work for teachers over summer school 2016, and will be available for early 2016-17 preparations.

I decided not to "label" the life forms on the film so that you have the option of studying, then showing the film as a challenge to see who can identify the characters as they appear. Tardigrades in particular are fascinating, as they have survival characteristics that put them in a class unlike anything found so far. I will leave to you the fun of researching them. All the clips have a few jerky movements both due to the characteristic behavior of the cells, as well as because microscope slide shifts were needed by original photographers (in order to keep the tiny specimens in view at large magnifications).

Because tardigrades are exceptionally small "animals" yet extra large protozoans, about 3x the size of paramecia, they are visually separated as they make an opening and closing appearance, first as if "up close" in water, then on a moss background. After some opening scenes for context, all others move around in a surrounding of simulated algae.

Order of appearance:
tardigrade in water
amoeba
amoeba2
diatom
euglena (also at opening title)
a gonium cluster
euglenas again with cyclops (daphne)
hydra trying to catch daphne
paramecium and twin (capable of moving much faster)
crowd of rotifers
volvox ball
vorticella colony
tarigrade on moss

possible teaching aids:
http://sciencenetlinks.com/lessons/pond-2-life-in-a-drop-of-pond-water/
http://www.microscope-microscope.org/applications/pond-critters/pond-critters.htm
http://www.microscopyu.com/moviegallery/pondscum/
http://www.msnucleus.org/watersheds/mission/plankton.pdf
http://serc.carleton.edu/microbelife/topics/tardigrade/index.html
http://serc.carleton.edu/microbelife/topics/tardigrade/resources.html
http://www.biodiversityexplorer.org/metazoa/tardigrades/index.htm
http://www.microscopy-uk.org.uk/mag/artmay99/dwbeara.html

See other films by DeepRiverVisions at https://www.teacherspayteachers.com/Store/Deep-River-Visions
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