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image of Journal of Crustacean Biology

ABSTRACT We performed ablation and electroantennulogram experiments to determine the site of pheromone reception in the crayfish Orconectes propinquus. The inner or outer branches of the antennules were bilaterally ablated from test male and female crayfish. In "inner ablation" males, behavioral responses to female chemicals were unchanged relative to controls. However, a highly significant reduction in response occurred in "outer ablation" animals. Tests with female ablates yielded similar results, indicating that the outer antennular flagella mediate pheromone reception in this species. We did not obtain reliable results from the electroantennulogram studies and suggest that previously reported electroantennulograms from crayfish may be artifactual.

Affiliations: 1: Department of Zoology, University of Toronto, Toronto, Ontario M5S 1A1, Canada


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