Then let’s discuss aquatic macroinvertebrates. I observed more variety
and greater numbers of insect larvae in the warmer sections of the river.
Of course, I know that insect distributions are affected by more than
just the water temperature. The river’s sediment and the rate the
water is flowing are other important factors. Now I realize the thermal
runoff adds bicarbonates to the river which increases plant growth on
the bottom of the stream. This means there is more food available and
more surfaces for bottom-dwelling creatures to attach themselves.
In streams affected by thermal pollution, the respiration
and growth rates of certain species of macroinvertebrates sometimes change,
as well as their feeding rates and reproduction patterns. This dovetails
with observations made here in Yellowstone. The macroinvertebrates in
the thermally influenced waters of the park vary more in shape and size
than their counterparts
in cooler water—and some even experience changes in life behavior.
What do you mean?
are macroinvertebrates in streams affected by thermal pollution?
physical and chemical processes by which an organism takes in and
uses oxygen and emits carbon dioxide
fit or coincide with
a person or thing that closely resembles another