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首页> 外文期刊>Marine biology >Maternal versus environmental constraints on the oocyte size of a marine pelagophil fish
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Maternal versus environmental constraints on the oocyte size of a marine pelagophil fish

机译：母体与环境对海洋嗜中性粒细胞鱼类卵母细胞大小的限制

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摘要

We investigated maternal body size and environmental effects on the oocyte size of the Atlantic sardine, Sardina pilchardus, a marine pelagophil, using a novel, oocyte stage-specific approach which takes into account the spawning lag. In particular, we focused on anatomical constraints imposed by the maternal body cavity to the growth of the ovary and its oocytes during the course of vitellogenesis (VIT) and oocyte maturation (OM). We analyzed variability in oocyte size in VIT and OM ovaries as a factor of maternal size, ambient temperature (SST) and preservation medium (formalin vs. ethanol) using the spawning lag of recent and imminent spawners, respectively, as a covariate. We showed that oocyte size correlates with maternal size in OM ovaries but not in VIT ovaries. More specifically, 10 cm difference in maternal body length corresponds to 0.112 mm(2) (or 12 %) difference in the cross section of fully hydrated oocytes just previous to ovulation. On the other hand there was no inverse relationship between OM oocyte size at spawning and batch fecundity. Ambient SST was not an important determinant of hydrated oocyte size since the same 12 % difference in oocyte size was estimated for the entire SST range of the study. We suggest that these stage-specific differences in the effect of maternal size on oocyte size are due to a functional relationship between the abdominal volume and ovarian size.
机译：我们使用一种新的卵母细胞阶段特有的方法，考虑了产卵滞后，研究了产妇的体型和环境对大西洋沙丁鱼，沙丁鱼Sardina pilchardus卵母细胞大小的影响。特别地，我们集中于母体腔在卵黄发生（VIT）和卵母细胞成熟（OM）过程中对卵巢及其卵母细胞的生长施加的解剖学约束。我们分别使用近期和即将产卵的产卵滞后作为协变量，分析了VIT和OM卵巢中卵母细胞大小的变异性，这些变异性是母体大小，环境温度（SST）和保存培养基（福尔马林对乙醇）的一个因素。我们显示卵母细胞大小与OM卵巢中的母体大小相关，而与VIT卵巢中不相关。更具体地说，母体长度的10 cm差异对应于排卵前完全水合的卵母细胞横截面的0.112 mm（2）（或12％）差异。另一方面，产卵时OM卵母细胞大小与分批繁殖力之间没有反比关系。环境SST不是水合卵母细胞大小的重要决定因素，因为在整个研究的SST范围内，卵母细胞大小的相同差异估计为12％。我们建议，这些母体大小对卵母细胞大小的影响的特定阶段差异是由于腹部体积和卵巢大小之间的功能关系引起的。

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  • 来源
    《Marine biology》 |2015年第9期|1879-1888|共10页
  • 作者

    Ganias K.; Rakka M.; Mantzouki E.; Vavalidis T.; Tsinganis M.; Nunes C.;

  • 作者单位

    Aristotle Univ Thessaloniki, Sch Biol, Thessaloniki 54124, Greece;

    Aristotle Univ Thessaloniki, Sch Biol, Thessaloniki 54124, Greece;

    Aristotle Univ Thessaloniki, Sch Biol, Thessaloniki 54124, Greece;

    Aristotle Univ Thessaloniki, Sch Biol, Thessaloniki 54124, Greece;

    Aristotle Univ Thessaloniki, Sch Biol, Thessaloniki 54124, Greece;

    IPMA, P-1449006 Lisbon, Portugal;

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