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- W1899362004 abstract "Laboratory-reared specimens of the nudibranch Hermissenda crassicornis (Eschscholtz, 1813) possess statocysts that contain either one, several, or a species-typical number of statoconia (150-200). The number of statoconia per statocyst is significantly related to the growth rate of the animal during its first month post-metamorphosis, with slower-growing individuals (<0.88 mm/day) tending to possess a single statoconium bilaterally. Laboratory-reared animals with statocysts containing a single statoconium exhibited significantly weaker conditioning effects as expressed by faster response latencies to enter an illuminated area one and two days following behavioral training as compared with laboratory-reared animals with more than one statoconium per statocyst. Rotation of the isolated nervous systems of preparations with a single statoconium revealed that caudal hair cells exhibited reduced depolarization and the hyperpolarization of Type B photoreceptors in response to rotation was absent. As the number of statoconia increased, caudal hair cell depolarization and type B cell hyperpolarization occurred with increasing frequency. Cell responses to rotation were identical to those recorded from wild-type cells when the number of statoconia exceeded eight.Statocysts from laboratory-reared animals with a single statoconium possess the same number (13) of sensory (hair) cells, but differ from typical statocysts (150-200 statoconia) in that they are about half the normal size, the lumenal diameter is reduced, the hair cells are about twice as thick, and the sensory cilia are closer together. Both ciliary morphology and basic histology are similar in laboratory-reared and field-collected animals.Decreased mechanotransduction is postulated to be primarily responsible for the changes in behavioral conditioning and sensory cell activity observed in these laboratory-reared animals. This decreased sensory transduction results from reduction in statoconia number and restricted movement of the stones in statocysts with reduced lumina." @default.
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- W1899362004 date "1986-04-01" @default.
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- W1899362004 title "BEHAVIORAL, ELECTROPHYSIOLOGICAL, AND MORPHOLOGICAL INVESTIGATIONS OF STATOCYST FUNCTION IN THE NUDIBRANCH MOLLUSCHERMISSENDA CRASSICORNIS" @default.
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- W1899362004 doi "https://doi.org/10.2307/1541811" @default.
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