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« Brutal Honesty About Bay 'Cleanup' Efforts | Main | President Obama's Climate Plan and Your Pocketbook »

02/26/2009

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Tom,

Great Blue Herons have significantly increased in the bay region.
Between 1977 and 2003 the number of Great Blue Heron colonies increased over 1,500%. The actual population did not increase as much only about 500% (from 2,476 to 14,744 pairs) So Great Blue Herons are secure and doing well.

DDT and its metabolites did impact Great Blue Herons and they benefited from the banning. They also have benefited from the general change in attitudes towards bird conservation that the passage of the migratory bird treaties initiated about 100 years ago. It has been a slow steady climb for many species ever since.

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