Literaturdatenbank
Literaturdatenbank |
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Mahmoud, I. Y., & Cyrus, R. V. (1992). The testicular cycle of the common snapping turtle, chelydra serpentina, in wisconsin. Herpetologica, 48(2), 193–201.
Added by: Sarina Wunderlich (23 Aug 2008 14:56:22 UTC) Last edited by: Beate Pfau (06 May 2009 17:30:00 UTC) |
| Resource type: Journal Article BibTeX citation key: Mahmoud1992a View all bibliographic details  |
Categories: General Keywords: Chelydra, Chelydra serpentina, Chelydridae, Fortpflanzung = reproduction, Habitat = habitat, Histologie = histology, Nordamerika = North America, Physiologie = physiology, Schildkröten = turtles + tortoises Creators: Cyrus, Mahmoud Collection: Herpetologica |
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| Abstract |
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Chelydra serpentina We studied the timing and patterns of testicular activity of the common snapping turtle, Chelydra serpentina, in Wisconsin. Spermatogenesis begins in May and terminates in September. During spring and early summer, the testes are flaccid and exhibit their minimal mass. Maximal testicular mass is exhibited during the second half of July and in August coincident with spermiogenesis and spermiation. In November, there is a decline in spermatogenic activity and testicular mass. The testes remain regressed throughout the winter months. The epididymis attains its maximal mass during August and early September as the spermatozoa migrate into the luminae. The epididymal mass remains high until the following spring when it abruptly declines, reaching minimal mass during early summer; it remains low until spermiation. In Wisconsin, it appears that temperature is an important factor in regulating spermatogenic activity. The gradual rise in water temperature between May and August is correlated with spermatogenesis and testicular growth. The decrease in temperature after August is correlated with testicular regression. Added by: Sarina Wunderlich Last edited by: Beate Pfau |