Fig. 2

Study areas for Alligator Gar (Atractosteus spatula) telemetry research on the Brazos River (BR) and Trinity River (TR), along with major tributaries in each. Manual tracking data were obtained from datasets explored in [33] and [25], respectively (i.e., BR and TR study). In (a), the extent of the BR study is in grey with white circles denoting manual telemetry relocations. In (b), black lines represent the extent of manual tracking in the TR study with grey circles denoting manual telemetry relocations. Where the light blue line begins in (b), a lock and dam structure near Wallisville, Texas acts as a saltwater barrier to prevent salinity intrusion into the lowermost Trinity River at its mouth in Trinity Bay. Black shaded areas denote major reservoirs in each study including Lake Somerville in (a) and Lake Livingston in (b)