[The model of statoconia distribution in the gravity receptors of shells in ontogenesis].
Based on the experimental data of Wiederhold et al., analyzed was distribution of statoconia in gravireceptors of Biomphalaria glabrata and Aplysia californica in ontogenesis. A mathematical model of size distribution of statoconia in statocyst Biomphalaria glabrata in ontogenesis has been developed. Growth of statoconia in size is described as a process of crystallization from solution. Hypothetically, redistribution of statoconia in ontogenesis is determined by generation of new statoconia and their linear growth in size. Comparison of the resultant analytical solution of the model with published experimental data revealed a number of characteristic stages in statoconia development. Generation of new statoconia if peculiar for stage 1 and proceeds till the shell diameter (D) becomes as large as 4 mm. At D > 6 mm, statoconia distribution is driven by their size growth at a permanent rate. In the interval of delta D = 4-6 mm, statoconia undergo redistribution which is probably connected with selective dissolution of big statoconia and ensuing period of linear growth. The model is in good agreement with the literature on experimental data and, therefore, is instrumental in evaluation of changes in statoconia distribution. The authors laid out plans of further experiments in order to test the model of statoconia distribution in Biomphalaria glabrata in ontogenesis, and to get quantitative description of statoconia distribution in the gravireceptor of Aplysia californica in ontogenesis.
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D000818:Animals; D006112:Gravitation; D018466:Gravity Sensing / Q000502:physiology*; D008954:Models, Biological; D008974:Mollusca / Q000254:growth & development*; D010037:Otolithic Membrane / Q000502:physiology*; D011984:Sensory Receptor Cells / Q000502:physiology*