Document Detail

Reproductive endocrinology of female elasmobranchs: lessons from the little skate (Raja erinacea) and spiny dogfish (Squalus acanthias).
MedLine Citation:
PMID:  10469994     Owner:  NLM     Status:  MEDLINE    
Conventional classification of reproductive modes in female elasmobranchs fails to account for the diversity in ovarian dynamics that operate during oviparous and viviparous cycles. Delineating this diversity is crucial for understanding the endocrine regulation of the manifold physiological mechanisms utilized to retain and protect eggs and developing embryos, to fuel embryogenesis, and to manage the intrauterine milieu. Oocyte development and follicular steroidogenesis overlap with egg retention and pregnancy in some species, whereas in others the follicular phase of the cycle is temporally separated from the gravid period. A luteal phase predominates the post-ovulatory period in viviparous species. In oviparous species, the luteal phase overlaps with the follicular cycle. This heterogeneity in ovulatory cycles suggests that the endocrine system evolved a transmutable system for regulating steroidogenesis and the control of the reproductive events. The reproductive biology and endocrinology of the oviparous little skate and lecithotrophic viviparous spiny dogfish are reviewed in order to derive a working hypothesis that explains the complex nature of endocrine patterns observed in species utilizing disparate reproductive modes. An understanding of the adaptations in ovarian dynamics to particular ovulatory cycles is key to developing theories about the evolution of reproductive strategies in female elasmobranchs. J. Exp. Zool. 284:557-574, 1999.
T J Koob; I P Callard
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Review    
Journal Detail:
Title:  The Journal of experimental zoology     Volume:  284     ISSN:  0022-104X     ISO Abbreviation:  J. Exp. Zool.     Publication Date:  1999 Oct 
Date Detail:
Created Date:  1999-10-08     Completed Date:  1999-10-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375365     Medline TA:  J Exp Zool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  557-74     Citation Subset:  IM    
Copyright Information:
Copyright 1999 Wiley-Liss, Inc.
Skeletal Biology, Shriners Hospital for Children, Tampa, Florida 33612, USA.
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MeSH Terms
Dogfish / physiology*
Endocrine System / physiology*
Gonadal Steroid Hormones / physiology
Ovary / physiology*
Ovulation / physiology
Reproduction / physiology*
Skates (Fish) / physiology*
Species Specificity
Reg. No./Substance:
0/Gonadal Steroid Hormones

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

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