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首页> 外文期刊>Marine biology >When fragmented coral spawn? Effect of size and timing on survivorship and fecundity of fragmentation in Acropora formosa
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When fragmented coral spawn? Effect of size and timing on survivorship and fecundity of fragmentation in Acropora formosa

机译：珊瑚破碎时会生成什么？大小和时机对福建棘果凤梨存活和分裂的繁殖力的影响

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摘要

In order to determine competency of sexual reproduction and survival rate after fragmentation, the branching coral Acropora formosa was fragmented and fragments in three different sizes (ca. 5, 10 and 20 cm long) and three different stages of gametogenesis were transplanted on coral pavement. Their oocyte development and fecundity, as well as spawning were monitored for a 3-year period. The oocyte development was affected by both fragment size and by the developmental stage of oocytes when fragmented. In small fragments, the oocytes were resorbed while in large fragments they continued development. Oocytes in the early vitellogenic stage at the time of fragmentation were resorbed, whereas those in the late stage continued developing. Smaller fragments showed a lower survival rate and histological observations of their gonads revealed resorption of oocytes, suggesting that there was a trade-off of energy between reproduction and survival. Transplanted fragments often spawned one month earlier than the donor colonies in the first year, but spawning occurred in the same month as the donors or did not occur at all in the second year and none spawned in the third year. The risk of colony death may cause the fragments to re-allocate energy for sexual reproduction.
机译：为了确定碎裂后的性繁殖能力和存活率，将分支的珊瑚角螺（Acropora formosa）碎裂，并将三种不同大小（长约5、10和20 cm）和三个不同配子发生阶段的碎块移植到珊瑚路面上。对其卵母细胞的发育和繁殖力以及产卵情况进行了为期3年的监测。卵母细胞的发育受片段大小和卵母细胞破碎时的发育阶段的影响。在小碎片中，卵母细胞被吸收，而在大碎片中，卵母细胞继续发育。卵裂初期卵黄形成早期的卵母细胞被吸收，而晚期卵母细胞则继续发育。较小的碎片显示出较低的存活率，并且其性腺的组织学观察显示卵母细胞被吸收，这表明在繁殖和存活之间存在能量的折衷。移植的碎片通常在第一年比供体菌落早一个月产卵，但是产卵发生在与供体相同的月份，或者在第二年根本没有发生，在第三年没有产卵。菌落死亡的风险可能会导致碎片重新分配能量以进行有性繁殖。

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  • 来源
    《Marine biology》 |2007年第1期|p.353-363|共11页
  • 作者

    Nami Okubo; Tatsuo Motokawa; Makoto Omori;

  • 作者单位

    Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa 226-8501, Japan;

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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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