Fig 2. Key functions used for the estimation of abundance of nurse sharks (Ginglymostoma cirratum) from transect data.

(A) Histogram of recorded perpendicular distances in transect surveys (before transformation for distance sampling analysis), key functions fitted in distance sampling analysis (B) uniform function with cosine adjustment, (C) half-normal function, and (D) hazard-rate function with ecosystem type as covariate. Detection probabilities associated with each function are presented in the top-right corner.