Yes, of course. Animals are often more finely-tuned to changes in an environment
than humans. Once upon a time, canaries were taken into coal mines to
detect the presence of dangerous gases. These birds are very sensitive
to changes in air quality, so the miners could judge whether the air was
safe to breathe by observing its effects on the canaries.
In a similar manner, aquatic macroinvertebrates have different sensitivities
to water pollution. Both those macroinvertebrates that are sensitive to
and those tolerant of pollution can live in a stream with good water quality.
With increased pollution, however, fewer sensitive creatures will be found.
If the water quality is very poor, only those macroinvertebrates that
are tolerant of pollution