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. Author manuscript; available in PMC: 2020 May 13.
Published in final edited form as: J Morphol. 2008 Aug;269(8):909–921. doi: 10.1002/jmor.10608

Fig. 8.

Fig. 8.

Effect of age, size, and sex on numbers of germ cells in anadromous and lacustrine threespine stickleback (Gasterosteus aculeatus) populations during the period of gonadal differentiation. A: Total germ cells increase rapidly in females (circles) relative to males (triangles) and Rabbit Slough fry (RS, solid symbols) possess more germ cells at each age than Bear Paw fry (BP, open symbols). The timing of the initiation of meiosis in genetic females is indicated. B: Population differences in SL (mm) do not account for differences in numbers of germ cells in females. Splines are shown for eased visualization (dotted = Bear Paw, solid = Rabbit Slough). Germ cells were counted based on cellular morphology in two populations of threespine stickleback as described in the Methods. Genetic sex was determined by PCR (as described).