adaptation vs exaptation

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bionewbie
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adaptation vs exaptation

Post by bionewbie » Sun Apr 09, 2006 12:39 am

Hi, I would really appreciate if somebody wouldn't mind explaining to me the difference between adaptation and exaptation? How does these two terms relate to evolution?
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit nature and more time tasting her sweetness and respecting her seniority. ~ E. B. White

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Linn
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Post by Linn » Sun Apr 09, 2006 2:27 am

well ,I would like to know too.
so I am not getting in on this one but will
:lol: :lol: :lol: :lol:
actualy shut my mouth and listen :shock:
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver

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mith
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Post by mith » Sun Apr 09, 2006 2:43 am

adaptation-A biological adaptation is an anatomical structure, physiological process or behavioral trait of an organism that has evolved over a period of time by the process of natural selection such that it increases the expected long-term reproductive success of the organism.

i.e. giraffes evolving longer necks to reach tree leaves

exaptation-term coined by steven jay gould, an evolutionary process in which a given adaptation is first naturally selected for, and subsequently used by the organism for something other than its original, intended purpose

i.e. evolving wings which would be useful for body temperature control, but useless for flying(they're too small) until they evolved larger.
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Accepting hardships as the pathway to peace;
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bionewbie
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Post by bionewbie » Sun Apr 09, 2006 2:53 am

so how do these two terms relate to analogous and homologous structures?
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit nature and more time tasting her sweetness and respecting her seniority. ~ E. B. White

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mith
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Post by mith » Sun Apr 09, 2006 4:38 am

well think about it for a moment, it's quite simple.
*hint think of origin and purpose.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

bionewbie
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Post by bionewbie » Mon Apr 10, 2006 2:51 am

well, i know that analogous structure deals with characteristics that perform similar functions but not the same evolutionary origin. homologous structure, on the other hand, deals with characteristics that share a common ancestor but not for the same function.
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit nature and more time tasting her sweetness and respecting her seniority. ~ E. B. White

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Post by bpv » Wed May 31, 2006 7:09 pm

Personally I dont agree with any of the evolutionary theories. But from the knowledge point of view I may explain Adaptation as the adjustment of an organism with its environment or the the changes in the environment. While exaptation is the form of adaptation in which the organism uses the the part of the body, to perform a particular task which is not the actual psysiological function of that part.

In adaptation the physiological part is modified with reference to the need while in exaptation, extra tasks are performed by the organs without any physiological modification in structure.

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