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Habitat and environment


 
Frogs and tadpoles in floods

 
Play  What happens to frogs and tadpoles in floods?  frogs and floods.mp3  
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Unlike frogs, tadpoles cannot escape from their watery homes. However, they do detect ‘early warning signs’ for example, changes in river water temperature, increase in flow rates and current changes and try to move to calmer, more protected habitat. Otherwise, they are likely to be washed away (as occurs with small fishes too), and may not survive a hostile relocation or injuries from the rushing torrent.
Frogs on the other hand are able to quickly vacate the water and seek shelter away from the stream, thanks to their even more sensitive warning systems. They can detect changes in air pressure which tend to accompany storms and rain. Tree frogs are usually first out while ground dwellers seek higher more protected ground.

 
Frogs in toilet bowls    

 
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Frogs and your garden    

 
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Do frogs migrate?    

 
Play  Do Australian frogs migrate?  frogwrangerone migration4min5.mp3  
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In the northern hemisphere there are some frogs that migrate, moving to another area to hibernate when winter arrives. These frogs move between summer and hibernation sites as the seasons dictate and the paths are so well known they are taken into consideration when building European motorways. For Australian frogs the pattern is different and even though they do move around it is not migration.

Australian frogs are dispersers, meaning they are highly opportunistic in the way that they move. For the most part they move around familiar areas in search of food but when it rains it gives the frogs an opportunity to move to a new area where there is less competition for food resources. Some frogs die as a consequence of this dispersal activity because they won’t find suitable habitats.

Dispersal is also dependent on the development stage of frogs, with juveniles (less than one year old) highly dispersive. This is because large frogs eat little ones so the threat from predation is very real so it is not surprising that they are the ones to move when rain arrives.

Text: V.B. January 2010

 
Australian frogs overseas    

 
Play  Have any Australian frogs been introduced into other countries?
  Australianfrogsoverseas.mp3  
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Frogs in winter    

 
Play  What do frogs do in winter?  Whatdofrogsdoinwinte2min 52.mp3  
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Frogs and pollution    

 
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Frogs in salty water    

 
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Frogs in the snow    

 
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Desert frogs    

 
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Frogs - the world's canaries?    

 
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