Hi
I'm working with an endangered amphipod.  I would like to do some isotope 
analysis (C&N) to look at diet but I can't sacrafice wild individuals.  However, I 
do have a permit to remove walking legs for genetic analysis.  One large 
amphipod (dried) weighs approximately 4.0 mg and one dried leg weighs 
approximately 0.185 mg.  What is the smallest sample weight that can be 
measured accurately?  Can I analyze individual legs, 3 or 4 legs, or do I need 
to do the whole individual?  I realize the whole individual would probably be 
best but again, I can't sacrafice individuals.  Thanks a lot.

Dan Nelson
MS Student
University of Idaho