Hi folks;

I have a dataset on stable isotopes involving differences in consumption of
Carbon and Nitrogen between two species (nest builder and inquiline). I
used "siar" package and I had two ellipses with Carbon in the x axes and
Nitrogen in y axes.

OK, the point is that I can see (visually) a clear separation between the
two species when I draw the ellipses. However, I'm stuck in how can I
(analytically) calculate niche differentiation, or even better, overlapping
area of ellipses to demonstrate that the two species are separated.

If anyone can help me, thanks in advance.

-- 
==========================================
Ricardo Ribeiro de Castro Solar (Curriculo
Lattes<http://lattes.cnpq.br/9924177207371692>
)
MSc. em Entomologia - Doutorando - PPG Entomologia
Laboratório de Ecologia de Comunidades/Formigas <http://www.labecol.ufv.br>
(31) 3899-4018 - Contato Skype: rrsolar
Universidade Federal de Viçosa - MG
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