Modulation of claw-closing behavior in the crayfish Procambarus clarkii by extrinsic factors and biogenic amines

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Abstract:

Claw closure in the crayfish can be elicited by tactile stimulation of the closer-field sensory hairs located along the biting surfaces of the apposed dactyl and propodite. The possibility that this simple behavior can be extrinsically modulated was examined by stimulating closer-field hairs in specimens of the crayfish Procambarus clarkii while the animals were either unrestrained, restrained, or bathed in chemical feeding stimulants. Restraint increases both the probability of closure and the average angular velocity of the dactyl during closure compared with responses in unrestrained specimens. Chemical feeding stimulants increase the probability, but not the average angular velocity, of closure compared with the unrestrained condition. Injection of octopamine into unrestrained animals produces effects on claw closure that resemble those accompanying restraint. Injection of serotonin, however, is followed by decreases in both the probability and the average angular velocity of closure. It is argued that extrinsic factors modulate claw-closure behavior in ways appropriate to current circumstances, and that biogenic amines are implicated as "gain-setters" in this process.

La fermeture de la pince chez l'écrevisse peut être provoquée par stimulation tactile des poils sensoriels du champ de fermeture le long des surfaces mordantes du propodite et du dactyle apposés. Nous avons examiné la possibilité que ce comportement simple soit sous contrôle extrinsèque en stimulant les poils sensoriels du champ de fermeture chez des écrevisses Procambarus clarkii libres, immobilisées ou trempées dans des stimulants alimentaires chimiques. L'immobilisation augmente à la fois la probabilité de fermeture et la vitesse angulaire moyenne du dactyle au cours de la fermeture par comparaison avec des écrevisses libres. Les stimulants alimentaires chimiques augmentent la probabilité de fermeture, mais pas sa vitesse angulaire moyenne. L'injection d'octopamime à des animaux libres produit, sur la fermeture de la pince, des effets semblables à ceux de l'immobilisation. Une injection de sérotonine, cependant, est suivie d'une diminution de la probabilité de fermeture et de la vitesse angulaire moyenne. Il semble donc que des facteurs extrinsèques régissent le comportement de fermeture de la pince de façons appropriées aux circonstances du moment et que des amines biogènes servent de facteurs déterminants des gains (gain-setters) au cours du processus.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2001

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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