Open AccessREGULATION AND KINETICS OF SPERMATOGONIAL PROLIFERATION IN ARENICOLA MARINA (ANNELIDA, POLYCHAETA) I. THE ANNUAL CYCLE OF MITOTIC INDEX IN THE TESTIS
Author(s) -
Olive P. J. W.
Publication year - 1972
Publication title -
cell proliferation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.647
H-Index - 74
eISSN - 1365-2184
pISSN - 0960-7722
DOI - 10.1111/j.1365-2184.1972.tb00363.x
Subject(s) - mitotic index , biology , mitosis , population , colchicine , andrology , microbiology and biotechnology , medicine , genetics , environmental health
The annual variation in the mitotic index of the testis of Arenicola marina after 48 hr treatment with colchicine has been determined. This mitotic index in the population is distributed log‐normally. The mean mitotic index is low in winter but increases during the spring to a maximum in early summer. The mean mitotic index remains high until September when it decreases temporarily. There is a second minor increase in the mean mitotic index prior to spawning. Decerebration of animals prior to the spring increase in the mitotic index did not prevent this increase occurring in decerebrate animals maintained in the laboratory. Removal of the coelomic gametes was effective in stimulating the testicular mitotic index only when performed during the period of low mitotic activity in early autumn.