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Thread: U. livida

  1. #9
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    I'd like to present two theories on how these two populations could exist (on two separate continents).

    1) Assuming at U. livida is a REALLY old species, it could date back to when the Americas and Africa were one continent.

    2) More likely seeds got transported by migratory birds...pooper planting I think it's called [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]

    I guess it's also possible that it was moved my early explorers with or without their knowledge and just became a ferral species in one location....but we'd never be able to tell, would we? [img]http://www.**********.com/iB_html/non-cgi/emoticons/confused.gif[/img]
    17 Nash Rd.
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    YOU! Outta my gene pool!

  2. #10

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    Continental drift can be ruled out for the U. livida disjunction - we would be talking about several tens of millions of years. Besides the time, it is found in Mexico, not South America, although at least it would have had plenty of time to migrate north. All the other species of section Calpidisca (I think that's the right one) are found only in Africa, so it seems most likely that the migration was from there to Mexico, rather than vice versa. I think migrations are more usually in the opposite direction (West to East) due to prevailing winds, but maybe these are variable? Birds would be more likely to carry seeds on the outside rather than inside. Genetic studies sampling both African and Mexican populations would be useful in confirming what actually occurred, and could provide an estimate of the time that it happened, using a molecular clock.

    Giles

  3. #11
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    Giles,
    I tend to agree with you on the continental drift thing....it was really just idol speculation. I think the migratory theory is better. I think migration patterns must be both directions....depending on the time of year, you'd just say they moved if they never came back [img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img] (pack up your bags, I got re-located!! LOL)
    17 Nash Rd.
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    YOU! Outta my gene pool!

  4. #12

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    The only plausible explanations seem to be movement of a seed or stolons to Mexico by wind, lost bird or humans. I'd probably opt for wind or bird as most likely, but an idea of the date of this event could help to rule in/out humans. Migration doesn't have to be bi-directional.

    'Idol speculation' sounds interesting - maybe you're trying to corner the market in religious figurines? [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img]

  5. #13

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    I wonder if there are actually any herbarium records of U. livida from Mexico!
    "Grow More, Share More"

  6. #14

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    I'm sure there are - look in Taylor if you have a copy - he says it is widespread throughout the country except in the lowlands.

  7. #15

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    Giles,

    I reckon Paul would know. I don't have that book, alas.
    "Grow More, Share More"

  8. #16
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    Lightbulb

    Quote
    'Idol speculation' sounds interesting - maybe you're trying to corner the market in religious figurines? [/QUOTE]

    LOL!! I thought that looked wrong....

    [img]http://www.**********.com/iB_html/non-cgi/emoticons/wow.gif[/img]
    17 Nash Rd.
    North Salem, NY 10560

    YOU! Outta my gene pool!

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