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View Diary: Weekly Mulch: Oil Spill Could Bring Mass Extinction to the Gulf Coast (13 comments)

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  •  That's already happened (2+ / 0-)

    in most threatened species, the extirpation of local populations reduced dynamic species diversity.  When we tried to rebuild these species, either by reintroduction or habitat reconstruction much of that genetic diversity had already been weakened.

    You tried to use bird species for your example; while it is true that many species (heck, I'd say "most") are very particular about their breeding range, returning to even the same tree year after year (even if they've migrated hundreds or even a few thousand miles to do so) if not the same tree, the same stand or forest, they are much more intermingled than non-migratory species.  This tends to reduce the threat of a locally introduced disease.  But you still have the threat of introduced disease; witness the way West Nile ravaged the corvid populations in the northeast the last 5 years.

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