Document Detail

Morphological changes in the clasper gland of the Atlantic stingray, Dasyatis sabina, associated with the seasonal reproductive cycle.
MedLine Citation:
PMID:  16270309     Owner:  NLM     Status:  MEDLINE    
The clasper gland of the Atlantic stingray, Dasyatis sabina, was examined over a 1-year period, covering an entire reproductive cycle. Changes in clasper gland tissue architecture, fluid production, and cell proliferation were assessed. No changes in tissue architecture were observed. Evidence of cell proliferation in the gland epithelium was not detected using immunocytochemistry for proliferating cell nuclear antigen, a cellular marker of mitosis. Epithelial cells were not observed to undergo mitosis, and cell membranes remained intact. The lack of structural changes and epithelial cell proliferation supports the proposed merocrinal mode of fluid secretion. Rays captured in nonbreeding months had clasper glands that exhibited tubules with reduced lumens. In contrast, rays caught during the breeding season had clasper gland tubules with enlarged lumens. Clasper gland fluid production was quantified through measurements of the fluid area and tubule area calculated from digital images. Clasper gland fluid production was significantly higher during the mating period than during months not associated with copulatory activity. These data support the notion that the clasper gland is involved in stingray copulatory activity. This study adds to the limited amount of literature focused on this poorly understood component of reproduction in skates and rays.
A Piercy; J Gelsleichter; F F Snelson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of morphology     Volume:  267     ISSN:  0362-2525     ISO Abbreviation:  J. Morphol.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-12-05     Completed Date:  2006-01-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  109-14     Citation Subset:  IM    
Copyright Information:
(c) 2004 Wiley-Liss, Inc.
University of Central Florida, Department of Biology, Orlando, Florida 32816, USA.
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MeSH Terms
Cell Proliferation
Epithelium / anatomy & histology,  physiology
Gonads / anatomy & histology*,  physiology
Skates (Fish) / anatomy & histology*,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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