Summary
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1.
Intact, freely-behaving Aplysia californica were monitored continuously for 24 h via time-lapse video and in vivo extracellular electrophysiological recording during 24 h exposure to both ambient normoxia (6.1—6.9 ppM dissolved O2) and hypoxia (1.2–2.7 ppM dissolved O2) followed by 1–2 h of aquarium reoxygenation.
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2.
In ambient normoxia, the stereotyped behavior known as respiratory pumping (RP) was found to spontaneously occur in several forms other than the solitary behavioral response previously described.
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3.
The most extreme variant of the new forms of RP was that of the RP seizure which was a series of RP responses (20–60) that occurred over a 30–90 min period and in a pattern characterized by a progressively greater inter-response interval. RP seizures occurred at frequencies ranging from 0–3 times per 24 h.
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4.
The time-course of RP seizure inter-response intervals was stereotyped across animals while seizure duration and the number of RP responses within a seizure were more similar for a given animal than across animals.
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5.
The other forms of RP included double and triple RP responses and abbreviated RP seizures. One instance of a double RP seizure was recorded.
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6.
Prolonged exposure to ambient hypoxia depressed all forms of RP.
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7.
Aquarium reoxygenation returned RP activity levels to near that prior to hypoxia exposure; seizure rate was above that occurring in ambient normoxia.
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8.
Potential physiological ramifications of RP seizures are discussed along with a possible mechanism to account for the repertoire of naturally-occurring RP behaviors.
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Abbreviations
- RP :
-
Respiratory pumping
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Kanz, J.E., Quast, W.D. Respiratory pumping seizure: a newly discovered spontaneous stereotyped behavior pattern in the opisthobranch mollusc Aplysia californica . J Comp Physiol A 166, 619–627 (1990). https://doi.org/10.1007/BF00240011
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DOI: https://doi.org/10.1007/BF00240011