Annual reproductive cycle in two free living populations of three-spined stickleback (Gasterosteus aculeatus L.): patterns of ovarian and testicular development
Annual reproductive cycle in two free living populations of three-spined stickleback (Gasterosteus aculeatus L.): patterns of ovarian and testicular development
The annual reproductive cycle in two wild populations of three-spined stickleback
was studied. Sticklebacks from the Dead Vistula River (Martwa Wisła) (brackish
water) and the Oliva Stream (Potok Oliwski) (freshwater) were exposed to annual
environmental changes in their natural habitats. Ovaries and livers (females), and
testes and kidneys (males) were collected during 1–2 years. The gonadosomatic
IG, hepatosomatic IH, nephrosomatic IN indices, kidney epithelium height (KEH)
and size of oocytes were calculated. The number of mature oocytes and percentage
of ovulating females were determined during the spawning season. Histological
changes in the ovaries and testes were described throughout a year. Annual
reproductive cycles were similar in both populations of sticklebacks. This is
the first histological and morphological study carried out throughout a year,
simultaneously in two wild populations of three-spined sticklebacks inhabiting
different environments. An improved scale of gonadal development in conjunction
with the determined indices and fecundity give a comprehensive description of
the reproductive cycle. These newobserv ations, in combination with previously
reported features, provide a universal scale that can be successfully used to
distinguish all phases of gametogenesis in sticklebacks in different habitats.
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