Beta distributions used to generate detectability in the “abundance” scenarios for the different covariate categories.

<p>Lines correspond to (solid), (dashed) and (dotted). Panel (a) displays the probability density functions (pdf) for the distributions used by WLD (Scenario B1) and panel (b) for the distributions used in our Scenarios B2 and B3. The distribution that WLD used for has considerable mass for detectability very close to zero: . Panels (c-d) display the pdf of the probability of detecting the species in at least one of <i>K</i> surveys () at sites (from darker to lighter, lines correspond to ).