Frogs/Tadpoles Learn About Predators As Embryos

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	Frogs/Tadpoles Learn About Predators As Embryos

celestialdancer

11-2-2009 3:42 PM

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/112ddc5a-44b3-4682-bc00-33f5bf91e46f/49A9E82E-3522-43F6-95BB-72E66CFC9038/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://blogs.discovermagazine.com/80beats/2009/11/02/an-early-education-as-embryos-frogs-sniff-out-predators/" href="http://blogs.discovermagazine.com/80beats/2009/11/02/an-early-education-as-embryos-frogs-sniff-out-predators/" style="font-size: 11px;">blogs.discovermagazine.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.discovermagazine.com/80beats/2009/11/02/an-early-education-as-embryos-frogs-sniff-out-predators/"><P><IMG width="220" height="99" alt="tadpole-web" src="http://blogs.discovermagazine.com/80beats/files/2009/10/tadpole-web.gif" title="tadpole-web" class="alignleft size-full wp-image-5078" />Frog tadpoles have a good nose for danger: Scientists know that they go from headlong swimming to total stillness when they smell a predator. Now, researchers have discovered that frogs get that odoriferous training very early on. When they’re still embryos, they can learn to assess the threat level by sniffing for a predator’s <A href="http://blogs.discovermagazine.com/80beats/tag/pheromones/" linkindex="26">pheromones</A>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.discovermagazine.com/80beats/2009/11/02/an-early-education-as-embryos-frogs-sniff-out-predators/"><SPAN><SPAN>In an experiment sure to make PETA squirm, crushed tadpoles were mixed with water in which a tiger salamander had been swimming. Embryos were raised in this water with different concentrations of crushed tadpoles. Once the embryos had hatched into tadpoles, researchers tested their response to only the salamander odor. </SPAN></SPAN><SPAN>The tadpoles that were exposed to a higher concentration of the injured tadpole odour stayed motionless for longer in response to the salamander cue [<A href="http://news.bbc.co.uk/2/hi/science/nature/8331822.stm" linkindex="29">BBC News</A>].</SPAN><SPAN><SPAN><SPAN> </SPAN>The scientists say this demonstrates that these tadpoles learned as embryos that salamanders were more dangerous predators.</SPAN></SPAN></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/49A9E82E-3522-43F6-95BB-72E66CFC9038/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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