How do cold-blooded species cope in cold water?

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John Harrison

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How do cold-blooded species cope in cold water?
« on: 26/06/2009 16:30:02 »
John Harrison asked the Naked Scientists:
   
Cold Bloodedness:  We all know that reptiles must sun themselves in order to build the energy / ability to sustain activity.  This attribute is generally attributed to the fact that they are cold blooded.
 
How then is it possible for other cold-blooded species (fish, invertebrates such as octopus, squid, etc.) to sustain high levels of activity in near freezing water?

What do you think?

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Offline Nizzle

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How do cold-blooded species cope in cold water?
« Reply #1 on: 18/08/2009 10:23:00 »
For an important chemical reaction, poikilotherms [cold-blooded animals] may have four to ten enzyme systems that operate at different temperatures. As a result, poikilotherms often have larger, more complex genomes than homeotherms [warm-blooded animals] in the same ecological niche. Frogs are a notable example of this effect.

Because their metabolism is so variable, poikilothermic animals do not easily support complex, high-energy organ systems such as brains or wings.[citation needed] Poikilothermic animals do not use their metabolisms to heat or cool themselves. For the same body weight, poikilotherms need half to 1/10 of the energy of homeotherms, and thus eat half to 1/10 of the biomass.

source: http://en.wikipedia.org/wiki/Poikilotherm

So to answer your question: They have specialized enzymatic systems.
« Last Edit: 18/08/2009 10:24:43 by Nizzle »
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Offline thedoc

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yoyo jojo

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« Reply #3 on: 05/03/2014 22:37:34 »
Can cold blooded animals live in warm water?????