A floating mid-water coral nursery as larval dispersion hub: testing an idea
A floating mid-water coral nursery as larval dispersion hub: testing an idea
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DOI：
10.1007/s00227-006-0512-0
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发表时间：
2007-04-01
期刊：
影响因子：
2.4
通讯作者：
Rinkevich, B.
中科院分区：
文献类型：
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作者：
Amar, K. O.;Rinkevich, B.
全球珊瑚礁健康状况的下降促使需要有效的管理方法，包括制定积极的恢复措施。其中一种方法是使用水下苗圃，在将珊瑚碎片移植到裸露的珊瑚礁之前，在那里养殖珊瑚碎片。在这里，我们记录了在红海埃拉特养鱼场附近的营养丰富的水域的中水漂浮苗圃中养殖的珊瑚Stylophora pistila群体的增强有性繁殖。我们发现，经过两年的培育，养殖群体的平均每条息肉的卵母细胞数比相应的自然生长群体高出约35%。苗圃中的小树枝发育出怀孕的群体，与类似大小的5岁自然生长的群体相比，释放的浮萍幼虫数量相等(或更多)。这些幼虫的虫黄藻较多，每头幼虫的叶绿素含量也较高。虽然与来自珊瑚礁生长的殖民地的浮萍相比，定居和变性的速度相同，但苗圃出生的浮萍发育得更快，生长的年轻殖民地更快。我们估计，珊瑚苗圃在繁殖季节可产生数千万条浮萍幼虫，因此应被视为“幼虫分散中心”，可用作增加自然补充的管理工具。
The global decline in reef health has prompted the need for effective management methodologies, including the development of active restoration measures. One such approach is the ‘gardening concept’ that involves use of underwater nurseries where coral fragments are farmed before their transplantation into denuded reefs. Here we document enhanced sexual reproduction in colonies of the coralStylophora pistillatacultured in mid-water floating nursery situated in nutrient enriched water, near the fish farms in Eilat, Red Sea. We found that after 2 years of nursery, the average number of oocytes per polyp in farmed colonies was ca. 35% higher than in corresponding naturally growing colonies. Small branches in the nursery developed gravid colonies that released equal (or more) numbers of planula larvae as compared to similar size, 5-year old naturally growing colonies. These nursery-borne planulae possessed more zooxanthellae and contained more chlorophyll per larva. While settled and metamorphosed in equal rates compared to planulae originated from reef-grown colonies, the nursery borne planulae developed faster growing young colonies. We estimate that a coral nursery could generate, during the reproductive season, tens of millions of planula larvae and therefore should be regarded as a ‘larval dispersion hub’ that can be used as a management tool for natural recruitment enhancement.