Chemical and chemotactic stimulation of feeding behavior in the hermit crab Petrochirus diogenes

Abstract

Various concentrations of fish juice were introduced to appendages of freely moving specimens of Petrochirus diogenes. 1. The threshold concentration for chemical elicitation of feeding behavior was over ten times as high for the ambulatory dactyls as for the antennules. 2. Combining tactile input with chemical input decreased the behavioral threshold of the dactyl receptors tenfold. 3. Ablation of the antennules was followed, over a two-week period, by a loo-fold increase in behavioral sensitivity to dactyl stimulation.

Dual antennular chemosensory pathways can mediate orientation by Caribbean spiny lobsters in naturalistic flow conditions

“…Additionally, over the short time frame of these experiments, we saw no evidence that non-antennular chemoreceptors may be able to compensate for the loss of antennular chemoreceptors, as has been shown over a longer time period for other species (Hazlett, 1971b).…”

Dual antennular chemosensory pathways can mediate orientation by Caribbean spiny lobsters in naturalistic flow conditions

“…Additionally, over the short time frame of these experiments, we saw no evidence that non-antennular chemoreceptors may be able to compensate for the loss of antennular chemoreceptors, as has been shown over a longer time period for other species (Hazlett, 1971b).…”

Antennular mediated host location by symbiotic crustaceans†

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Observations with the scanning electron microscope on a filamentous bacterium present on the aesthetasc setae of the brown shrimpCrangon crangon(L.)

“…However, this could only be confirmed with certainty by directly recording from the first order chemoreceptor cells. Hazlett (1971) has shown that ablation of the antennules of the hermit crab Petrochirus diogenes initially leads to a reduction in the sensitivity of the whole animal to food chemicals. However, within 2 weeks, sensitivity is regained, apparently due to a compensatory increase in the responsiveness of the central nervous system to stimulation of the dactyl chemoreceptors.…”

Dual antennular chemosensory pathways can mediate orientation by Caribbean spiny lobsters in naturalistic flow conditions

“…Additionally, over the short time frame of these experiments, we saw no evidence that non-antennular chemoreceptors may be able to compensate for the loss of antennular chemoreceptors, as has been shown over a longer time period for other species (Hazlett, 1971b).…”

Antennular mediated host location by symbiotic crustaceans†

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Observations with the scanning electron microscope on a filamentous bacterium present on the aesthetasc setae of the brown shrimpCrangon crangon(L.)

“…However, this could only be confirmed with certainty by directly recording from the first order chemoreceptor cells. Hazlett (1971) has shown that ablation of the antennules of the hermit crab Petrochirus diogenes initially leads to a reduction in the sensitivity of the whole animal to food chemicals. However, within 2 weeks, sensitivity is regained, apparently due to a compensatory increase in the responsiveness of the central nervous system to stimulation of the dactyl chemoreceptors.…”

Dual antennular chemosensory pathways can mediate orientation by Caribbean spiny lobsters in naturalistic flow conditions

“…Additionally, over the short time frame of these experiments, we saw no evidence that non-antennular chemoreceptors may be able to compensate for the loss of antennular chemoreceptors, as has been shown over a longer time period for other species (Hazlett, 1971b).…”

Antennular mediated host location by symbiotic crustaceans†

“……”

“……”

Observations with the scanning electron microscope on a filamentous bacterium present on the aesthetasc setae of the brown shrimpCrangon crangon(L.)

“…However, this could only be confirmed with certainty by directly recording from the first order chemoreceptor cells. Hazlett (1971) has shown that ablation of the antennules of the hermit crab Petrochirus diogenes initially leads to a reduction in the sensitivity of the whole animal to food chemicals. However, within 2 weeks, sensitivity is regained, apparently due to a compensatory increase in the responsiveness of the central nervous system to stimulation of the dactyl chemoreceptors.…”