Greetings,

I have several questions regarding use of sulfur stable isotopes,
particularly in the marine environment.  Understandably, 34S has been used
on microbial systems (marshes, estuarine and hydrothermal vent
communities), with the general trend being marine sulfur to be more
enriched than freshwater/estuarine.  My question is, why has sulfur not
been applied to marine zooplankton and fish?  To my knowledge, very little
work has been done on this.  My guess is that once in the marine
environment, sulfur values vary and are not linked to any particular
(known) mechanism/process.  Another question is, how much material do I
need for sulfur analysis of marine zooplankton and fish.

If anyone out there has ideas or thoughts on this (or references!), it
would be greatly appreciated!

Sincerely,
Todd