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    Thread: Nephila clavata (Joro Spider)

    1. #11
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      The "beneficial" are NATIVE, whereas the invasives are not?

      L. geometricus overwhelm areas by sheer "mass production" of eggsacs (most recorded from ONE female is 33!) and thus establish themselves in other widows' "territory".

      It's been over 15 years since I have seen any widows other than L. geometricus. Before that the natives were everywhere.

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      Quote Originally Posted by JumpSpidersInc View Post
      The "beneficial" are NATIVE, whereas the invasives are not?

      L. geometricus overwhelm areas by sheer "mass production" of eggsacs (most recorded from ONE female is 33!) and thus establish themselves in other widows' "territory".

      It's been over 15 years since I have seen any widows other than L. geometricus. Before that the natives were everywhere.

      Some of what's 'native' has gotten there by storms, hurricanes, and even accidently (or intentionally) by earlier humans. In the big picture it can be a fine line of determining what's native or introduced. How do you establish a cutoff date? Maybe humans could have accidently spread black widow's range over the past few hundred years, we assume they're native where we currently find them. Maybe brown widows are reclaiming some of their former range. Ranges and extinctions have been very dynamic for millions of years, and humans have played a part in that for hundreds of thousands of years. When we look at one tiny slice of time, things may sometimes get distorted.

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      Poec....you really make me look at things differently sometimes! Thank you
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      Quote Originally Posted by Biollantefan54 View Post
      Poec....you really make me look at things differently sometimes! Thank you
      The world's fauna has changed drastically from 10,000 years ago. In the US there were woolly mammoths, huge colombian mammoths, mastodons, woolly rhinos, lions, sabre tooth cats, cheetahs, hyenas, dire wolves, camels, giant ground sloths, giant armadillos, etc. When the ocean levels were low during the last ice age 16,000 years ago humans from Asia crossed over Beringia into Alaska and into the Americas. They lived with all these animals; hunted them and were hunted by some of them. Imagine what they'd think if they saw this country today.

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