Fine structure of the sterile testis of hybrid threespine stickleback between marine and landlocked forms.

概要

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The process and cause of male sterility of a hybrid between female marine (M) and male landlocked (L) forms (M_??_×L_??_) of the threespine stickleback were studied by ekamining the testes of this hybrid and backcross offspring between M_??_and F<SUB>1</SUB> (L_??_×M_??_) (MOLM_??_). In the M form numerous spermatids were elaborated and contained in the apical processes of the Sertoli cells, whereas in the ML and MOLM forms there were a number of macrophages in the lobular cavity with numerous projected pseudopodia engulfing voraciously the spermatids. As a result of this heavy phagocytosis the seminiferous lobules were quite vacant. Curiously, the Sertoli cells also actively project its processes and pseudopodia to catch the spermatids. In addition to morphometrical, behavioral and biochemical-genetic differences, these findings of sterility seem to suggest that the M form and L form represent independent species.
日本魚類学会の論文