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Thread: Human speciation

  1. #1 Human speciation 
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    Hey iv noticed just a few adaptations in some humans such as immunity to certain disease in india and the increased length of time some people can spend under water.
    Now as quite a few towns/villages are isolated where this happens and i was wondering if given enough time it would humans eventually split again and form two or more species( or perhaps a cline).
    Perhaps this is inevitable if we manage to expand out of our solar system but i was curious as to how likely it would be to occur on earth. Of course then again not nearly enough time may have past.

    Any comments appreciated


    just wondering
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  3. #2  
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    Hey,
    I'm no expert on Evolution, but I imagine that expansion out of the solar system would not be necessary in order to drive divergence of species. In fact, I'm sure of it - geographical isolation by other, Earth-bound, means has proven sufficient to drive Evolution throughout natural history.

    As for the rest, it remains a point of speculation as to whether Homo sapiens will ever diverge to spawn a novel species. Prerequisites to such an event would probably include geographical isolation, differing selection pressures plus time on an evolutionary scale.

    Tridimity


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  4. #3  
    Moderator Moderator TheBiologista's Avatar
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    Quote Originally Posted by tridimity
    Hey,
    I'm no expert on Evolution, but I imagine that expansion out of the solar system would not be necessary in order to drive divergence of species. In fact, I'm sure of it - geographical isolation by other, Earth-bound, means has proven sufficient to drive Evolution throughout natural history.

    As for the rest, it remains a point of speculation as to whether Homo sapiens will ever diverge to spawn a novel species. Prerequisites to such an event would probably include geographical isolation, differing selection pressures plus time on an evolutionary scale.

    Tridimity
    I think the problem Zendra may see with this is our increasingly globalized civilization. Free movement of genes across the globe will tend to act against divergence- though of course there are other kinds of breeding barriers besides geographical/spatial ones. The sort of hard geographical separation initially provided by our spread out into the solar system would be similar to what we experienced in our early history. The question is whether we'd be separated into non interbreeding pockets for long enough before technology broke those barriers down again?
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  5. #4  
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    The thing is, yes we are globalized but in reality our genes do not mix freely. There are pockets of communities who will generally not interbreed with each other such as tribes found in forests/jungles or villages found in other remote areas. Could these groups not split of from the majority?
    just wondering
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  6. #5  
    Moderator Moderator TheBiologista's Avatar
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    Quote Originally Posted by zendra
    The thing is, yes we are globalized but in reality our genes do not mix freely. There are pockets of communities who will generally not interbreed with each other such as tribes found in forests/jungles or villages found in other remote areas. Could these groups not split of from the majority?
    I implied this in my answer. Yes hypothetically, though the length of time they'll be geographically separated may be insignificant on the evolutionary timescale, which would mean no.
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