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Water Bears (Tardigrade)

An AP biology presentation about Water Bears

Tyler Walsh

on 20 May 2011

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Transcript of Water Bears (Tardigrade)

Water Bears Animalia Tardigrada Heterotardigrada Echinischoidea Echinoscidae Echiniscis Structure Discovery, History Fun Facts Diet, Habitat, and Taxis Media 1770 2011 1773- First tardigrade discovered by Goetz 1994- contents of outer body covering found by Kinchin 1994-1996- Cryptobiosis discovered by Krinchin and Somme 1992- Tardigrades are found to be able to survive Arctic conditions 1950- Osmobiosis studied in tardigrades by Collin and May 1975- tardigrades found to be able to survive with minimal oxygen 1920's- it is discovered that tardigrades can withstand extreme heat for short periods of time Grow to be about 1mm in length Four pairs of limbs, with four to eight claws on the end of each limb body is covered with a cuticle which contains chitin, proteins, and lipids Have male and female individuals Anywhere from one to thirty eggs can be layed at a time by females Eggs are very light, allowing wind or animals to distribute them with ease Survival in Extreme Conditions Live in marine, freshwater, and semiaquatic terrestrial environments Feed off of mosses and lichens Can be found almost anywhere on Earth due to their ability to survive in nearly any conditions Ninety percent of all species are fresh water dwellers Feed on wet parts of plant and animal cells Bibliography
http://www.youtube.com Anhydrobiosis Cryobiosis Osmobiosis Anoxybiosis type of cryptobiosis used when water supplies are depleted Body becomes extremely folded and forms a tun Limbs retract and body folds longitudinally Wax covering forms Requires active metabolism Can survive in 0% humidity Revival process takes a few hours "One way in which tardigrades have adapted to various types of environments, has been to reversibly suspend their metabolism. This state is known as cryptobiosis and is a truly deathlike state. Metabolism lowers to 0.01% of normal or is entirely undetectable and the water content of the body decreases to less than 1%." Caused by temperature drops and increases Water within cells freezes Enables tardigrades to survive in Arctic conditions Can survive in temperatures as low as -200 degrees Celsius and as high as 151 degrees Celsius Other Tardigrades can survive the vacuum of space Can survive in extremely high radiation of up to 570,000 roentgens- a measure of 500 roentgens is fatal to humans Have lived on Earth for over 600 million years Sometimes known as "animals from space" Much more developed than any other animal of the same size Can also survive in conditions of high pressure Simply add water to revive! Initiated by a lowering of water potential in surrounding fluid Contract rapidly Can survive extremely high concentrations of salts Does not involve lowering of metabolism Caused by low oxygen concentrations Remain firm, extended, and immobile Can survive up to 6 months in closed vials oh gosh... Water Bears
Tyler T$ Walsh
Aaron Padme Snyder
Shane Bacon Pusey BY:
Tyler T$ Walsh
Aaron Padme Snyder
Shane Bacon Pusey Conclusion Water Bears (Tardigrades) are highly developed microscopic organisms that are well suited for nearly any environment and are being used to study cryptobiosis and other associated features Future Implications Water bears will continue to be studied in greater detail More and more will be known about them with the passing of time and eventually many of the mysteries surrounding cryptobiosis and other associated features The research being done will help improve technologies based upon the highly advanced characteristics of Tardigrades sdkgjhsdfkghsdfkghsdfkjgh uhhhh.....water bear?
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