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首页> 外文期刊>Marine biology >Reproduction and recruitment of scleractinian corals in a high-latitude coral community, Amakusa, southwestern Japan
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Reproduction and recruitment of scleractinian corals in a high-latitude coral community, Amakusa, southwestern Japan

机译：在日本西南部天草的高纬度珊瑚群落中繁殖和招募巩膜珊瑚

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摘要

Reproduction and recruitment in high-latitude coral populations in Japan have been little studied. A comprehensive study of the reproduction and early life history was conducted on nine common scleractinian coral species in Amakusa, southwestern Japan (32°N) from 2001 to 2003 including; (1) fecundity (the proportion of colonies with mature eggs), (2) timing and synchrony of spawning, (3) initial larval settlement pattern, (4) recruitment, (5) post-settlement mortality. The fecundity was high (76.7-100%) in six of seven species examined in 2002 and 2003. Annual spawning of the seven species occurred from mid July to August in 2001— 2003, when seawater temperature was at the annual maximum. Spawning was highly synchronised among conspecific colonies and species in 2002 and 2003, with five species spawning five to nine nights after the full moon and another two spawning around the new moon. Temporal patterns of larval settlement of three spawning species during the first 10 days after spawning were similar to those of other spawning species from low latitudes. The number of scleractinian recruits on settlement plates, deployed from July to October (the major recruitment period at the study site), was low (2 recruits/m~2) for the three consecutive years. Post-settlement mortality of 1-1.5 month old spat of five species ranged between 88 and 100% over 3-10 months in the field, similar to the values reported for both high and low latitude species ( > 94-99%). Among the key stages examined, the low recruitment rate may be the most important step in limiting successful reproduction and recruitment of these high-latitude scleractinian populations. The low recruitment rate may be attributable to (1) the reduced influx of larval supply from other coral populations, which are smaller and more isolated at high-latitudes and (2) the longer precompetent larval phase of broadcast-spawning corals which results in an increased chance of larvae being dispersed away from parent populations.
机译：在日本的高纬度珊瑚种群中繁殖和繁殖的研究很少。 2001年至2003年，在日本西南部天草（32°N）上对9种常见的巩膜珊瑚进行了繁殖和早期生活史的综合研究，其中包括： （1）繁殖力（带有成熟卵的菌落比例）；（2）产卵的时间和同步性；（3）幼虫最初的沉降方式；（4）募集；（5）定居后的死亡率。在2002年和2003年检查的七个物种中，有六个物种的繁殖力很高（76.7-100％）。这七个物种的年度产卵发生在2001年至2003年的七月中旬至八月，当时海水温度处于年度最高水平。在2002和2003年间，特定物种和物种之间的产卵高度同步，在满月之后的五到九晚产卵了五个物种，在新月周围产卵了另外两个物种。在产卵后的前10天，三个产卵物种的幼虫沉降时间模式与其他来自低纬度产卵物种的时间模式相似。从7月到10月（研究地点的主要招募时期）部署的沉降板上的Scleractinian招募人数连续三年很少（2招募/ m〜2）。五种物种在1-1.5个月大时的定居后死亡率在田间3-10个月内介于88％至100％之间，与报道的高纬度和低纬度物种的数值相似（> 94-99％）。在所审查的关键阶段中，低招募率可能是限制这些高纬度巩膜种群成功繁殖和招募的最重要步骤。低的招募率可能归因于（1）来自其他珊瑚种群的幼体供应量减少，这些幼体在高纬度地区更小，更孤立，以及（2）产卵繁殖期珊瑚的幼稚期较长，这导致幼虫从亲代种群中散失的机会增加。

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