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4 months ago ::
Jan 24, 2012 - 5:06PM
#28
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By definition ... But an "Invasive" (novel) Species MAY have profound Effects until it becomes an adapted "Native" in its own right ...
I assume that you acknowledge that even non-invasive species have an impact upon their ecosystem?
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4 months ago ::
Jan 24, 2012 - 4:19PM
#27
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I assume that you acknowledge that even non-invasive species have an impact upon their ecosystem?
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4 months ago ::
Jan 24, 2012 - 4:04PM
#26
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No, we don't ... We DO know that Invasive Species and Climate Change have an Impact on existing Ecosystems and their Residents ...
The fact is, we don't really know:
www.anthro.utah.edu/PDFs/grayson--jar07....
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4 months ago ::
Jan 24, 2012 - 3:36PM
#25
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4 months ago ::
Jan 23, 2012 - 9:38PM
#24
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They ate all the pretty horses.
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4 months ago ::
Jan 23, 2012 - 9:28PM
#23
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Can't quantify it with any Precision ... But many Paleontologists think that Paleo-Hunters hastened the Extinction of Wooly Mammoths and other large Pleistocene Fauna ...
"Before ANY European Invasive Colonization happened, "Native" Indigenous Peoples had ALREADY greatly altered North America, possibly including hastening The Extinction of Pleistocene MegaFauna ..."
"Greatly altered"? How do you quantify that?
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4 months ago ::
Jan 23, 2012 - 9:07PM
#22
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"Before ANY European Invasive Colonization happened, "Native" Indigenous Peoples had ALREADY greatly altered North America, possibly including hastening The Extinction of Pleistocene MegaFauna ..." "Greatly altered"? How do you quantify that?
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4 months ago ::
Jan 23, 2012 - 8:41PM
#21
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Thanks for the info. I wonder how a creationist would explain such a rapid change from single to multicellularity. That seems like too big a jump for "variation within kinds."
There are three sides to every story: your side, my side, and the truth.
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4 months ago ::
Jan 23, 2012 - 7:57PM
#20
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Depending on which culture, between 20 and 100 generations. You can get the details in: Evolutionary Ecology 12:153-164 - Boraas, M.E., Seale, D.B., and Boxhorn, J.E. (1998) Phagotrophy by a flagellate selects for colonial prey: A possible origin of multicellularity.
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4 months ago ::
Jan 23, 2012 - 7:46PM
#19
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Now this is interesting:
www.wired.com/wiredscience/2012/01/evolution-of-multicellularity/
"An evolutionary transition that took several billion years to occur in nature has happened in a laboratory, and it needed just 60 days.
Under artificial pressure to become larger, single-celled yeast became multicellular creatures. That crucial step is responsible for life’s progression beyond algae and bacteria, and while the latest work doesn’t duplicate prehistoric transitions, it could help reveal the principles guiding them."
...
"Within just a few weeks, individual yeast cells still retained their singular identities, but clumped together easily. At the end of two months, the clumps were a permanent arrangement. Each strain had evolved to be truly multicellular, displaying all the tendencies associated with “higher” forms of life: a division of labor between specialized cells, juvenile and adult life stages, and multicellular offspring."
In 1998 a laboratory experiment catalyzed Chlorella Vulgaris cultures to become multi-cellular by placing them in a highly predatory environment.
How many generations did it take?
There are three sides to every story: your side, my side, and the truth.
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