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Posted Sat May 21 2011: from ScienceDaily:
Species Reemergence After Collapse: Possible but Different, Mathematical Model Shows http://apocadocs.com/s.pl?1305982057
Species pairs that disappear through hybridization after human-induced changes to the environment can reemerge if the disturbance is removed, according to a new mathematical model that shows the conditions under which reemergence might happen.... By simulating environmental disturbances that reduce the ability of individuals to identify and select mates from their own species, the model explores the mechanisms that cause hybridization between closely-related species. Hybridization can lead to population decline and the loss of biodiversity. For instance, certain species of stickleback fish have collapsed into hybrid swarms as water clarity in their native lakes has changed, and certain species of tree frogs have collapsed as vegetation has been removed around their shared breeding ponds. Such hybrid swarms can replace the original species.... "The encouraging news from an ecosystems service point of view is that, if we act quickly, we may be able to refill ecological niches emptied by species collapse. However, even if we can refill the niches, we probably won't be able to bring back the same species that we lost," Gilman said.
[Read more stories about: species restoration, habitat loss]

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'Doc Jim says:
Anything, anything to prevent a hybrid swarm!

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