Sentences with phrase «indicators of healthy ecosystems»
And for over 25 years, hundreds of Bay Area volunteers have tracked the numbers and movements of these magnificent birds, often considered indicators of healthy ecosystems, and set up the first and only bird of prey monitoring system in California at the Golden Gate Raptor Observatory (GGRO).
http://www.parksconservancy.org/ Not exact matches
«Trout are one of the best indicators of healthy river ecosystems; they're the aquatic version of the canary in the coalmine,» says NRDC's Theo Spencer.