Reproductive cycle of Urolophus cruciatus in south-eastern Australia: does the species exhibit obligate or facultative diapause?

Trinnie, Fabian I., Walker, Terence I., Jones, Paul L. and Laurenson, Laurie J. 2016, Reproductive cycle of Urolophus cruciatus in south-eastern Australia: does the species exhibit obligate or facultative diapause?, Marine biology, vol. 163, no. 11, pp. 1-17, doi: 10.1007/s00227-016-2976-x.

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Title Reproductive cycle of Urolophus cruciatus in south-eastern Australia: does the species exhibit obligate or facultative diapause?
Author(s) Trinnie, Fabian I.
Walker, Terence I.
Jones, Paul L.ORCID iD for Jones, Paul L. orcid.org/0000-0002-5028-5775
Laurenson, Laurie J.ORCID iD for Laurenson, Laurie J. orcid.org/0000-0003-2321-7512
Journal name Marine biology
Volume number 163
Issue number 11
Start page 1
End page 17
Total pages 17
Publisher Springer
Place of publication Berlin, Germany
Publication date 2016-11
ISSN 0025-3162
1432-1793
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Marine & Freshwater Biology
Summary Observations of synchronous rapid growth of embryos and ovarian follicles in pregnant females during the half-year December–May leading to parturition, ovulation, mating, and fertilization suggest Urolophus cruciatus has the capacity for an annual reproductive cycle. Conversely, the higher proportion of the pregnant females in the population carrying eggs than carrying embryos in utero during December–May and all pregnant females in the population only carrying eggs in utero during June–November indicate a longer reproductive cycle. Analysis based on the usual assumptions implies that the species most likely exhibits a biennial cycle with ~18-month period of diapause following ovulation prior to ~6-month period of rapid embryogenesis. However, it is feasible that the period of the cycle is triennial with ~30-month period of diapause or alternatively diapause varies among individuals and varies from year to year. Rather than exhibiting a fixed-term reproductive cycle where obligatory diapause leads to parturition timed every year to provide favourable conditions for neonates, as suggested for several other chondrichthyan species, U. cruciatus may exhibit facultative diapause where the period of diapause and hence the reproductive cycle varies depending on the prevailing environmental conditions or density-dependent factors as described for many terrestrial species. U. cruciatus is highly matrotrophic (>4000 % wet mass gain from ovum to full-term embryo), litter size (1–4) increases with maternal length, sex ratio among embryos is 1:1, and male breeding condition varies seasonally with peak sperm production coinciding with female ovulation.
Language eng
DOI 10.1007/s00227-016-2976-x
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
060803 Animal Developmental and Reproductive Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30089695

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