Ploidy of neurons was assessed by the method of nuclear DNA cytophotometry in ganglia of the central nervous system (CNS) in 28 species of Bivalvia belonging to 5 existing subclasses and having various bio-ecological characteristics. A significant variation in the nucleus size and chromatin structure was revealed on crush preparations and slides; however, almost all nuclei were diploid. Some species had nuclei with tetraploid DNA value (from 0.2 up to 1%) and with condensed chromosomes, the probable mitotic fraction of cells. It was concluded that variation in the sizes of neurons and of their nuclei in the given instance was of a functional character, and polyploidy was untypical for the nervous system of bivalves. Apparently, the polyploidy, as an evolutionary strategy of neuron growth, had no anatomical prerequisites in bivalves, which is similar to CNS oligomerization in higher gastropods, as they are devoid of any functional adaptive sense.
Russian Journal of Marine Biology – Springer Journals
Published: Nov 14, 2005
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