Ethological Isolating Mechanisms in Four Sympatric Species of Poeciliid Fishes

anal fin Approach Butts and Thrusts CALIFORN caudal fin choice tests conspecific females contact movements Copulation Attempt Dart Dart-Display degrees of preference differences discrimination discrimination learning display bouts display movements dorsal fin ethological isolating mechanisms Evade experience female behaviour female's females responded followed four species frequency Frontal Sigmoids gametes Glide gonopodium groups of females groups of males H.E. males heterospecific females Jerks male behaviour male choice male courtship male display male's males showed marked preference mating Mean T.R.T. naive males Non-courtship Nudge and Thrust observed occurred Orbit-Display Orientation pairs of females parae females parae males pelvic fin picta and parae picta females picta males poeciliid preference for conspecifics receptive behaviour receptive females reproductive isolation reticulata females reticulata males SAN DIEGO selection sequence diagram sexual sexual selection Sigmoid Displays significant species of female sperm Swimming sympatrically Table three F.G.s three species Thrust Intention Tilt total number virgin females vivipara females Wheeling