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Endocrine control of embryonic diapause in the Australian sharpnose shark Rhizoprionodon taylori

Citation

Waltrick, D and Jones, SM and Simpfendorfer, CA and Awruch, CA, Endocrine control of embryonic diapause in the Australian sharpnose shark Rhizoprionodon taylori, PLoS One, 9, (7) Article e101234. ISSN 1932-6203 (2014) [Refereed Article]


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Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0101234

Abstract

The reproductive cycle of the Australian sharpnose shark, Rhizoprionodon taylori, includes a temporary suspension of development at the commencement of embryogenesis termed embryonic diapause. This study investigated levels of 17βestradiol (E2), testosterone (T) and progesterone (P4) in plasma samples of mature wild female R. taylori captured throughout the reproductive cycle and correlated them with internal morphological changes. Levels of T were elevated through most of the embryonic diapause period, suggesting a role of this hormone in the maintenance of this condition. Increasing plasma T concentrations from late diapause to early active development were associated with a possible role of androgens in the termination of embryonic diapause. As in other elasmobranchs, a concomitant increase of E2 with ovarian follicle size indicated a direct role of this hormone in regulating vitellogenesis, while a peak in P4 suggested this hormone is associated with preovulation and ovulation. Additionally, significant correlations between photoperiod or water temperature and maximum follicular diameter and hepatosomatic index suggest that these abiotic factors may also play a role triggering and regulating the synchrony and timing of reproductive events.

Item Details

Item Type:Refereed Article
Keywords:seven gill sharks, reproduction, reproductive hormones
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Conservation and Biodiversity
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Jones, SM (Dr Susan Jones)
Author:Awruch, CA (Dr Cynthia Awruch)
ID Code:93973
Year Published:2014
Web of Science® Times Cited:7
Deposited By:Zoology
Deposited On:2014-08-25
Last Modified:2017-10-31
Downloads:189 View Download Statistics

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