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CHEMOSENSORY ROLE OF ANTENNULES IN THE BEHAVIORAL INTEGRATION OF FEEDING BY THE CRAYFISH CAMBARUS BARTONII

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image of Journal of Crustacean Biology

ABSTRACT We examined the use of the inner and outer rami in integrating the several behavior patterns used in feeding. Crayfish commonly suffer loss of, or damage to, antennules, during agonistic interactions. We analyzed the effects of antennular ramus ablations on the response of crayfish to sucrose, in terms of the feeding behavior patterns shown. Dissolved sucrose can be detected by crayfish without antennular rami, probably by sensilla elsewhere on the body (e.g., pereiopods or maxillipeds). When antennular rami are present, the introduction of sucrose solution causes an increase in the rate of 3 antennular movement patterns. The greatest increase is in Large Amplitude Movements, a phasic motor pattern that sweeps through the greatest volume of water. The next step in feeding, Substrate Searching with the dactylate pereiopods, is briefly initiated even without antennular rami. However, both the normal continuation of Substrate Searching, and also the subsequent feeding Leg-to-Mouth Movements (preingestion), depend on the presence of either inner or outer antennular rami, but do not require both.

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/content/journals/10.1163/193724097x00052
1997-01-01
2016-12-09

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