> >Easier to simply monitor the prevalence of indicator species in the
> streams.  Lack of such would then call for testing for sources of the
> responsible sources of the runoff causing the problem.
> How do you take into account seasonal variations in those populations??
>

It's all about comparison to "control" healthy streams at the same time of
season.  Really obvious once you get the hang of it.

> Easy for us ignorantes to dip a "clean" tube into the stream, cap it
while submerged, label, pack, and send to a lab.

Such a result would only reflect the residues in that tube of water at that
moment of stream flow.  Biomonitoring gives you a far better handle on the
biological consequences over time.

--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html