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View Diary: Dawn Chorus: Meet the locals! (84 comments)

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  •  The global population was down to about 30 birds (1+ / 0-)
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    sidnora

    at its lowest point back in the 1980s. Loss of genetic diversity would have occurred.  Since then breeding of captive birds is carefully controlled in an attempt to minimize any further of loss of genetic diversity.

    Interestingly Andean Condors have very low genetic diversity despite still being widespread in the Andes.

    Some species don't seem to show any ill effects from population bottlenecks (i.e. crashing down to a very small size, even if only for a short time) such as the Nene while others have genetic problems (e.g. Florida Panther).

    "To see both sides of a quarrel, is to judge without hate or alarm" - Richard Thompson

    by matching mole on Mon May 27, 2013 at 07:16:03 PM PDT

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    •  Interesting. (1+ / 0-)
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      matching mole

      We have seen both Andean Condors (in captivity)and nenes (in the wild). AFAIK,  the nenes are the rarest bird we've seen, with a global population of about 1000, though I remember them telling us when we were there that it was only about 300. I think they're nursing them back from the brink, like the condors.

      "The only thing we have to fear is fear itself."........ "The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little." (yeah, same guy.)

      by sidnora on Mon May 27, 2013 at 07:38:09 PM PDT

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