Figure 1.
(a) Schematic of the Upper Ocqueoc River (Millersburg, MI, USA) field site for female testing only. (b) Schematic of Upper Trout River (Rogers City, MI, USA) field site for male testing only. Transecting right (cR) and left (cL) PIT antennas recorded the number of test subjects that moved into the treatment subchannel (alternated each trial). Square-frame oR and oL PIT antennas recorded animals entering near the treatment source.