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首页> 外文期刊>Marine biology >Emergence of an oocytic circumnuclear ring in response to increasing day length in Atlantic herring (Clupea harengus)
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Emergence of an oocytic circumnuclear ring in response to increasing day length in Atlantic herring (Clupea harengus)

机译:在大西洋鲱鱼(Clupea harengus)中,随着天长度的增加,卵泡性环核环的出现

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摘要

Understanding physiological and environmen tal variables that initiate sexual maturity would provide fundamental information on life history dynamics. The aim of this study was to test the usefulness of the common circumnuclear ring (CNR), an oocytic structure similar to the Balbiani body, which appears just prior to oocyte development as a predictor of first maturation in Atlantic herring (Clupea harengus). The relative roles of physiol ogy (e.g. fat) and photoperiod as triggers of maturation were also investigated. Samples were collected in May 2008 (72°26'-73°84'N/l l°26'-18°40'E) and February 2009 (56°12'-59o45'N/0025'-03°06'W). These data suggested that thresholds in body size may influence the decision to mature. We also found that short days (winter solstice) may be the photoperiod trigger for a first-decision window for both Norwegian spring-spawning (NSS) and North Sea autumn-spawning (NSAS) herring. The second-decision window for NSAS herring maturation appears to be trig gered by longer days (spring equinox), while a decreasing rate of day lengthening may trigger NSS herring matura tion. So, photoperiodic cycle is a key determinate of the timing of maturation in Atlantic herring.
机译:了解引发性成熟的生理和环境变量将提供有关生活史动态的基本信息。这项研究的目的是测试普通环核环(CNR)的有用性,这种环卵结构类似于Balbiani体,它在卵母细胞发育之前就出现,可以预示大西洋鲱(Clupea harengus)首次成熟。还研究了体相学(例如脂肪)和光周期作为成熟触发因素的相对作用。在2008年5月(72°26'-73°84'N / ll°26'-18°40'E)和2009年2月(56°12'-59o45'N / 0025'-03°06'W )。这些数据表明,体型阈值可能会影响成熟的决定。我们还发现,短短的日子(冬至)可能是挪威春季产卵(NSS)和北海秋季产卵(NSAS)鲱鱼首次决定窗口的光周期触发因素。 NSAS鲱鱼成熟的第二个决策窗口似乎被更长的天数(春季春分)所触发,而减少日间延长的速率可能会触发NSS鲱鱼成熟。因此,光周期是决定大西洋鲱鱼成熟时间的关键。

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  • 来源
    《Marine biology》 |2012年第2期|p.341-353|共13页
  • 作者单位

    University of Aberdeen, Zoology Building, Tillydrone Avenue,Aberdeen AB24 2TZ, Scotland, UK;

    Institute of Marine Research, P.O. Box 1870, Nordnes,5817 Bergen, Norway;

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