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首页> 外文期刊>Marine biology >Reproduction in the sea pen Pennatula phosphorea (Anthozoa: Pennatulacea) from the west coast of Scotland
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Reproduction in the sea pen Pennatula phosphorea (Anthozoa: Pennatulacea) from the west coast of Scotland

机译：从苏格兰西海岸繁殖海笔Pennatulaphospheaa（Anthozoa：Pennatulacea）

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摘要

Reproduction in the sea pen Pennatula phosphorea Linnaeus 1758 was investigated in a population located in southern Loch Linnhe, west Scotland. This was accomplished through analysis of trends in oocyte size-frequency distribution and fecundity over a 12-month period. Pennatula phosphorea is dioecious and the study population exhibited a sex ratio of 1:1. Oogenesis in female P. phosphorea is characterised by the maintenance of a large pool of small oocytes throughout the year of which a small proportion (<30%) mature synchronously and are broadcast-spawned during the summer months of July and/ or August. Although spawning occurs annually, the duration of oogenesis exceeds 12 months. Initial oocyte generation is best described as 'quasi-continuous' as it may be suppressed during winter. The timing and periodicity of oogenesis and spawning may be related to seasonal environmental cues and it is proposed that annual spawning constitutes a brief and synchronous event. Fecundity is high in P. phosphorea, typically up to 50 oocytes per polyp and 40,000 oocytes per colony in medium to large colonies. Although mean polyp fecundity increased with colony size (axial rod length) there was no seasonal fluctuation in this measure of relative fecundity. Since only a small proportion of oocytes present are spawned each year, the present study advises caution when making inferences regarding the seasonal output of viable oocytes, especially on occasions where the definition of fecundity or the details of the oogenic cycle of a species are unclear. Pennatula phosphorea produces large oocytes (>500 um), indicative of the production of lecithotrophic larvae; this may confer certain advantages with respect to larval longevity and survival.
机译：在位于苏格兰西部Linnhe南部的一个种群中调查了海笔Pennatulaphosphoaea Linnaeus 1758的繁殖。这是通过分析12个月内卵母细胞大小，频率分布和繁殖力的趋势来完成的。 enna叶雌雄异株，研究人群的性别比为1：1。雌性P.phosphoa的卵子生成的特点是全年维持大量小卵母细胞，其中一小部分（<30％）同步成熟，并在7月和/或8月的夏季广播繁殖。尽管产卵每年发生一次，但卵子发生的持续时间超过12个月。最初的卵母细胞生成最好被描述为“准连续”，因为在冬季它可能会被抑制。卵子发生和产卵的时间和周期可能与季节环境线索有关，因此建议每年产卵构成一个短暂而同步的事件。产磷菌的繁殖力很高，在中等到大菌落中，每个息肉通常多达50个卵母细胞，每个菌落多达40,000个卵母细胞。尽管平均息肉繁殖力随菌落大小（杆长度）增加，但相对繁殖力的测量值没有季节性波动。由于每年仅产卵卵母细胞的比例很小，因此在推断活卵母细胞的季节性产量时，本研究建议谨慎行事，尤其是在繁殖力的定义或物种的卵生周期细节不清楚的情况下。 enna茎磷虾产生大卵母细胞（> 500 um），表明卵母为营养性幼虫；就幼虫的寿命和存活而言，这可以赋予某些优势。

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  • 来源
    《Marine biology》 |2008年第3期|p.303-314|共12页
  • 作者

    D. C. B. Edwards; C. G. Moore;

  • 作者单位

    Centre for Marine Biodiversity and Biotechnology, School of Life Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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