Fig 1. Map of the Mississippi Sound region and common bottlenose dolphin study area in the northern Gulf of Mexico.
a. The Mississippi Sound (2,129 km2), Lake Borgne (730 km2; area west of Half Moon Island), Bay Boudreau (778 km2; Marsh) common bottlenose dolphin stock area, surrounding waters, and the habitat strata (Inshore and Island) for estimating density and abundance (Island stratum − waters <1 km from a barrier island and a 2-km wide corridor in the passes between islands; Inshore stratum—waters north of the Island stratum and Bay Boudreau). b. Mississippi Sound study area with east-west transect lines for capture-recapture photo-identification surveys, and capture locations of 19 satellite-linked tagged dolphins (capture locations may represent multiple tagged dolphins).