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首页> 外文期刊>Marine biology >Reproductive cycle of Urolophus cruciatus in south-eastern Australia: Does the species exhibit obligate or facultative diapause?
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Reproductive cycle of Urolophus cruciatus in south-eastern Australia: Does the species exhibit obligate or facultative diapause?

机译：澳大利亚东南部的Urolophus cruciatus的生殖周期：该物种是否表现出专性或兼性滞育？

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摘要

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 similar to 18-month period of diapause following ovulation prior to similar to 6-month period of rapid embryogenesis. However, it is feasible that the period of the cycle is triennial with similar to 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.
机译：在12月至5月的半年中，怀孕女性的胚胎和卵巢卵泡同步快速生长导致分娩，排卵，交配和受精的观察结果表明，刺槐具有一年生生殖周期的能力。相反，在12月至5月期间，携带卵子的怀孕女性比例高于在子宫中携带胚胎的卵，而在6月至11月期间，仅在子宫中携带卵的人群中所有妊娠女性的生育周期更长。根据通常的假设进行的分析表明，该物种最有可能表现出两年一次的周期，排卵后的滞育期与18个月的滞育期相似，而快速胚胎发生的近似6个月的时期。但是，周期的周期为三年，与滞育的30个月相似，否则滞育可能因个体而异，并且每年不同。正如其他一些软骨鱼类所建议的那样，十字花科动物可能表现出兼性滞育，而滞育期和生殖周期可能会发生兼性的滞育，而不是表现出强制性滞育导致固定分娩导致每年分娩为婴儿提供有利条件的定期繁殖周期。取决于主要的环境条件或许多陆生物种所描述的密度相关因素而变化。十字形高度自养（从卵子到足月胚的湿重增加> 4000％），产仔数（1-4）随着母体长度的增加而增加，胚间的性别比为1：1，雄性繁殖条件随季节而变化精子生产高峰与女性排卵相吻合。

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  • 来源
    《Marine biology》 |2016年第11期|226.1-226.17|共17页
  • 作者

    Trinnie Fabian I.; Walker Terence I.; Jones Paul L.; Laurenson Laurie J.;

  • 作者单位

    Deakin Univ, Sch Life & Environm Sci, Warrnambool, Vic 3280, Australia|Govt Western Australia, Dept Fisheries, Western Australian Fisheries & Marine Res Labs, POB 20, North Beach, WA 6920, Australia;

    Univ Melbourne, Sch Bio Sci, Parkville, Vic 3010, Australia|Monash Univ, Sch Biol Sci, Clayton, Vic 3800, Australia;

    Deakin Univ, Sch Life & Environm Sci, Warrnambool, Vic 3280, Australia;

    Deakin Univ, Sch Life & Environm Sci, Warrnambool, Vic 3280, Australia;

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