I'm looking for some quick advice on collecting stable isotopes in the field.
I am collecting blood and feathers from Sooty shearwaters, and am wondering:
1) For blood: Do I have to use a centrifuge to spin to blood after it is collected in the field? Or will it be okay to just preserve with Ethanol?
2) If blood is collected, what is the timeframe I am looking at? I.e. does blood correspond to 1-2 weeks of feeding? 3-4 days? Or does it depend on whether or not I am using plasma vs. whole blood?