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indicator
(redirected from indicator species)

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Aspen or poplar trees are an indicator species for sweet soils that harbor worms, which attract them.
For anyone concerned about frogs, salamanders, and other amphibians' role as a key indicator species in the web of life, the author of the then authoritative Vertebrate Paleontology and Evolution (1988) traces their origins from when they evolved from creatures with fins to their current decline and precarious future.
If this wasn't enough bad news, long-time offshore-oil-drilling opponent Richard Charter was nice enough to forward me a story about how 20 years after the Exxon Valdez oil spill, key Prince William Sound indicator species are declining, including orcas, whose unique endemic whale language may soon go extinct along with the last local orca families.
 
 
 
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