Clarification re: delta in 2-species models

[Bill]

Hello all,

I was hoping for a clarification re: delta in 2-species models. Specifically if delta can indicate which of the two species in a two-species model might be detected less frequently within a survey period as a result of the other if delta is less than one (and there is little support for delta=1 in model ranking). I am using paramaterisation number one (no problems with convergence so far however I have only been using covariates for detection and not occupancy), and I understand (perhaps incorrectly) that delta is an expression of whether two species are detected independently at survey sites and is defined by: Delta = rAB(the probability of detecting both species)/rAxrB. When delta is less than one, I cannot work out from this equation which of the two species is driving this.

Many thanks for your time.