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FEMALE CRAYFISH ( PROCAMBARUS CLARKII (GIRARD, 1852)) USE BOTH ANTENNULAR RAMI IN THE LOCALIZATION OF MALE ODOUR BY TUHIN GIRI 1 ) and DAVID W. DUNHAM Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, Ontario M5S 3G5, Canada ABSTRACT Decapod crustaceans have bifurcated antennules, i.e., with an inner and an outer branch. The roles of these two types of rami in chemical transduction are controversial, because the results of different studies are not in agreement. The present study measures the success of female Procambarus clarkii in detecting the chemical presence of male conspeci cs, and in locating the source of these (as yet unidenti ed) chemicals, which included the social response of meral spread, in the presence and absence of the outer versus the inner rami. Detection was equally frequent by animals with all rami intact, with only outer rami, and with only inner rami. The distance from the source at which the chemicals were rst detected was similarly equal. The frequency of localizationof the odour source was also equivalent in three groups. Animals without antennular rami were much less successful in localization, and responded only when very close to the source. These results clearly demonstrate
Crustaceana – Brill
Published: Jan 1, 2000
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