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Whole extra-charged DNA spermatozoa in the saltwater crocodile (Crocodylus porosus) ejaculate
Saltwater crocodile spermatozoa examined in this study exhibited unusually high levels of extra DNA charged (2C and 4C) spermatozoa that can be explained by arrested cytokinesis at both meiotic divisions. From the ejaculates of five crocodiles, abnormal spermatozoa containing 2C (1–12%)
and 4C DNA (0–2%) charges were discriminated after assessing 1500 spermatozoa using morphological characterisation under fluorescence microscopic and image analysis protocols. Individual crocodiles with a high proportion of 2C spermatozoa in their ejaculate, also showed a high
level of DNA fragmentation in 1C sperm cells (8.7– 12.7%) but there was no such relationship between DNA fragmentation and 2C sperm. The value of whole extracharged sperm DNA in the ejaculate as a possible marker for fertility is discussed.
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Keywords: POLYPLOID SPERM; REPRODUCTION; REPTILE; SALTWATER CROCODILE; SPERM DNA FRAGMENTATION
Document Type: Short Communication
Publication date: October 1, 2016
- The Herpetological Journal is an international scientific journal that publishes papers on the natural history of amphibians and reptiles. Experimental, observational and theoretical studies are published along with reviews and book reviews. Faunistic lists, letters and results of general surveys are not published unless they shed light on herpetological problems of wider significance.
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