Nature has many cycles, interdepedences and connections, some we can imagine
and diagram, most we don't have a clue about. Populations respond to cycles
and changes. For example, A nesting pair of coopers hawks on our property
kept crows away. When the hawks stopped nesting, the crows moved in and the
robin nest success declined. Because there were less robins the next year,
much of the Elderberry crop wasted on the vine, those seeds did not get as
widely transferred. So the lack of a coopers hawk may lead to an abundance
of berries. A virus multiples in water which is slightly warmer than
usual, infecting the larvae cycle of midges, the midge hatch is reduced by
90%, and other insects that use midges as a primary food resource in a
particular time period are impacted, those insects whose reproductive
success depends upon that protein have a low reproductive season that year
and the impact cascades down food chains we know nothing about. Many of
these kinds of things we simply have no way to measure, track or even
notice. These are natural cycles. What happens when you throw in the oil
and chemical seepage from an application of asphalt from a summer paving
project, or Seattles change in ozone levels today due to smog, and changes
happen. Because of the complexity of systems, and our own lack of abilities
to measure, monitor and notice, we can never know the ultimate changes human
development actions put into the systems. We only notice when they break in
ways that impact us.

Rob Sandelin
Naturalist, Writer
The Environmental Science School
HYPERLINK
"http://www.nonprofitpages.com/nica/SVE.htm"http://www.nonprofitpages.com/ni
ca/SVE.htm
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