and the numbers of individuals
within each species in a given area.
However, by comparing
data that ties together
both density and diversity
from what we hear,
I'm able to arrive at much
more precise fitness outcomes.
And I want to show you some examples
that typify the possibilities unlocked
by diving into this universe.
This is Lincoln Meadow.
Lincoln
Meadow's a three-and-a-half-hour drive
east of San Francisco
in the Sierra Nevada Mountains,
at about 2,000 meters altitude,
and I've been recording
there for many years.
In 1988, a logging company
convinced local residents
that there would be absolutely
no environmental impact
from a new method they were trying
called "selective logging,"
taking out a tree here and there
rather than clear-cutting a whole area.
With permission granted to record
both before and after the operation,
I set up my gear and captured
a large number of dawn choruses