Alarm pheromone recognition in a Missouri darter assemblage

The a priori null hypotheses that response to donor, orangethroat darter Et heostoma spectabile, johnny darter Etheostoma nigrum, logperch Pereina capr odes, slenderhead darter Percina phoxocephala and blackside darter Percina maculata, extracts would be absent in the three test species, orangethroat darter, johnny darter and lo.-Perch, was rejected. This was because oranget hrout and johnny darter responded with decreased activity to skin extracts derived from conspecifics and from other members of the assemblage. In cont rast, logperch were notable by their lack of a detectable response to any s pecies. Similarities and differences in habitat utilization are seen as a p ossible basis for these responses, (C) The Fisheries Society of Lhc British Isles.